diff --git a/app/components/ConstructeurSelect.vue b/app/components/ConstructeurSelect.vue
index 7bf19d8..311f4e5 100644
--- a/app/components/ConstructeurSelect.vue
+++ b/app/components/ConstructeurSelect.vue
@@ -246,6 +246,16 @@ const emitSelection = (ids: string[]) => {
   emit('update:modelValue', normalized)
 }
 
+const extractDataArray = (data: unknown): ConstructeurSummary[] => {
+  if (Array.isArray(data)) {
+    return data as ConstructeurSummary[]
+  }
+  if (data && typeof data === 'object' && 'id' in data) {
+    return [data as ConstructeurSummary]
+  }
+  return []
+}
+
 const ensureOptionsLoaded = async (force = false) => {
   if (!force && !searchTerm.value && constructeurs.value.length) {
     applyOptions(constructeurs.value as ConstructeurSummary[])
@@ -262,7 +272,7 @@ const ensureOptionsLoaded = async (force = false) => {
 
   const result = await searchConstructeurs(searchTerm.value)
   if (result.success) {
-    applyOptions(result.data || [])
+    applyOptions(extractDataArray(result.data))
     lastSearchTerm = searchTerm.value
   }
 }
@@ -283,7 +293,7 @@ const onSearch = () => {
     }
     const result = await searchConstructeurs(searchTerm.value)
     if (result.success) {
-      applyOptions(result.data || [])
+      applyOptions(extractDataArray(result.data))
       lastSearchTerm = searchTerm.value
     }
   }, 250)
@@ -310,16 +320,18 @@ const closeCreateModal = () => {
 
 const handleCreate = async () => {
   creating.value = true
-  const payload = { ...createForm.value }
-  if (!payload.phone) {
-    delete payload.phone
+  const payload: { name: string; email?: string; phone?: string } = {
+    name: createForm.value.name,
   }
-  if (!payload.email) {
-    delete payload.email
+  if (createForm.value.email) {
+    payload.email = createForm.value.email
+  }
+  if (createForm.value.phone) {
+    payload.phone = createForm.value.phone
   }
   const result = await createConstructeur(payload)
   creating.value = false
-  if (result.success) {
+  if (result.success && result.data && !Array.isArray(result.data)) {
     emitSelection([...selectedIds.value, result.data.id])
     searchTerm.value = ''
     closeCreateModal()
diff --git a/app/components/ProductSelect.vue b/app/components/ProductSelect.vue
index a4bc49c..34c7d21 100644
--- a/app/components/ProductSelect.vue
+++ b/app/components/ProductSelect.vue
@@ -1,7 +1,7 @@
 <template>
   <div class="space-y-1">
     <SearchSelect
-      :model-value="modelValue"
+      :model-value="modelValue ?? undefined"
       :options="productOptions"
       :loading="loading"
       :placeholder="placeholder"
diff --git a/app/components/StructureNodeEditor.vue b/app/components/StructureNodeEditor.vue
index bce8a43..1886e8c 100644
--- a/app/components/StructureNodeEditor.vue
+++ b/app/components/StructureNodeEditor.vue
@@ -825,10 +825,9 @@ const customFieldReorderClass = (index: number) => {
 
 const addCustomField = () => {
   ensureArray('customFields')
-  const nextIndex = Array.isArray(props.node.customFields)
-    ? props.node.customFields.length
-    : 0
-  props.node.customFields.push({
+  const fields = props.node.customFields!
+  const nextIndex = fields.length
+  fields.push({
     name: '',
     type: 'text',
     required: false,
@@ -847,7 +846,7 @@ const removeCustomField = (index: number) => {
 
 const addPiece = () => {
   ensureArray('pieces')
-  props.node.pieces.push({
+  props.node.pieces!.push({
     typePieceId: '',
     typePieceLabel: '',
     reference: '',
@@ -863,7 +862,7 @@ const removePiece = (index: number) => {
 
 const addProduct = () => {
   ensureArray('products')
-  props.node.products.push({
+  props.node.products!.push({
     typeProductId: '',
     typeProductLabel: '',
     familyCode: '',
@@ -911,6 +910,7 @@ const moveItemInPlace = <T,>(list: T[], from: number, to: number) => {
   }
   const updated = list.slice()
   const [item] = updated.splice(from, 1)
+  if (item === undefined) return
   updated.splice(to, 0, item)
   list.splice(0, list.length, ...updated)
 }
diff --git a/app/components/common/RequirementListEditor.vue b/app/components/common/RequirementListEditor.vue
index 1764d63..a9a1e33 100644
--- a/app/components/common/RequirementListEditor.vue
+++ b/app/components/common/RequirementListEditor.vue
@@ -66,7 +66,7 @@
                 type="text"
                 class="input input-bordered input-sm"
                 :placeholder="labels.labelPlaceholder"
-                @input="updateRequirement(index, { label: $event.target.value })"
+                @input="handleLabelInput(index, $event)"
               />
             </div>
 
@@ -79,7 +79,7 @@
                 type="number"
                 min="0"
                 class="input input-bordered input-sm"
-                @input="updateRequirement(index, { minCount: parseNumber($event.target.value) })"
+                @input="handleMinInput(index, $event)"
               />
             </div>
 
@@ -93,7 +93,7 @@
                 type="number"
                 min="0"
                 class="input input-bordered input-sm"
-                @input="updateRequirement(index, { maxCount: parseOptionalNumber($event.target.value) })"
+                @input="handleMaxInput(index, $event)"
               />
             </div>
           </div>
@@ -113,7 +113,7 @@
               type="checkbox"
               class="checkbox checkbox-sm"
               :checked="(requirement.required ?? requiredFallback) === true"
-              @change="updateRequirement(index, { required: $event.target.checked })"
+              @change="handleRequiredChange(index, $event)"
             />
             {{ labels.requiredLabel }}
           </label>
@@ -123,7 +123,7 @@
               type="checkbox"
               class="checkbox checkbox-sm"
               :checked="(requirement.allowNewModels ?? allowNewModelsFallback) === true"
-              @change="updateRequirement(index, { allowNewModels: $event.target.checked })"
+              @change="handleAllowNewModelsChange(index, $event)"
             />
             {{ labels.allowNewModelsLabel }}
           </label>
@@ -277,6 +277,37 @@ const parseOptionalNumber = (value: string) => {
   return Number.isFinite(parsed) ? parsed : null
 }
 
+// Type-safe event handlers
+const getInputValue = (event: Event): string => {
+  const target = event.target as HTMLInputElement | null
+  return target?.value ?? ''
+}
+
+const getCheckboxValue = (event: Event): boolean => {
+  const target = event.target as HTMLInputElement | null
+  return target?.checked ?? false
+}
+
+const handleLabelInput = (index: number, event: Event) => {
+  updateRequirement(index, { label: getInputValue(event) })
+}
+
+const handleMinInput = (index: number, event: Event) => {
+  updateRequirement(index, { minCount: parseNumber(getInputValue(event)) })
+}
+
+const handleMaxInput = (index: number, event: Event) => {
+  updateRequirement(index, { maxCount: parseOptionalNumber(getInputValue(event)) })
+}
+
+const handleRequiredChange = (index: number, event: Event) => {
+  updateRequirement(index, { required: getCheckboxValue(event) })
+}
+
+const handleAllowNewModelsChange = (index: number, event: Event) => {
+  updateRequirement(index, { allowNewModels: getCheckboxValue(event) })
+}
+
 const draggingRequirementIndex = ref<number | null>(null)
 const requirementDropTargetIndex = ref<number | null>(null)
 
@@ -297,6 +328,10 @@ const reorderRequirements = (from: number, to: number) => {
   }
   const updated = list.slice() as Requirement[]
   const [moved] = updated.splice(from, 1)
+  if (!moved) {
+    resetRequirementDragState()
+    return
+  }
   updated.splice(to, 0, moved)
   requirements.value = applyOrderIndex(updated)
   resetRequirementDragState()
diff --git a/app/composables/useComponentTypes.js b/app/composables/useComponentTypes.ts
similarity index 50%
rename from app/composables/useComponentTypes.js
rename to app/composables/useComponentTypes.ts
index 2eab637..cd0f9bd 100644
--- a/app/composables/useComponentTypes.js
+++ b/app/composables/useComponentTypes.ts
@@ -1,14 +1,34 @@
 import { ref } from 'vue'
 import { useToast } from './useToast'
-import { listModelTypes, createModelType, updateModelType, deleteModelType } from '~/services/modelTypes'
+import { listModelTypes, createModelType, updateModelType, deleteModelType, type ModelType } from '~/services/modelTypes'
+import type { ComponentModelStructure } from '~/shared/types/inventory'
 
-const componentTypes = ref([])
+export interface ComponentType extends ModelType {
+  structure: ComponentModelStructure | null
+  description?: string | null
+}
+
+interface ComponentTypePayload {
+  name: string
+  code?: string
+  description?: string | null
+  notes?: string | null
+  structure?: ComponentModelStructure | null
+}
+
+interface ComponentTypeResult {
+  success: boolean
+  data?: ComponentType | ComponentType[]
+  error?: string
+}
+
+const componentTypes = ref<ComponentType[]>([])
 const loadingComponentTypes = ref(false)
 
-export function useComponentTypes () {
+export function useComponentTypes() {
   const { showSuccess, showError } = useToast()
 
-  const generateCodeFromName = (name) => {
+  const generateCodeFromName = (name: string): string => {
     return (name || '')
       .normalize('NFD')
       .replace(/[\u0300-\u036F]/g, '')
@@ -18,24 +38,26 @@ export function useComponentTypes () {
       .replace(/-+/g, '-') || 'type'
   }
 
-  const loadComponentTypes = async () => {
+  const loadComponentTypes = async (): Promise<ComponentTypeResult> => {
     loadingComponentTypes.value = true
     try {
       const data = await listModelTypes({
         category: 'COMPONENT',
         sort: 'name',
         dir: 'asc',
-        limit: 200
+        limit: 200,
       })
 
-      componentTypes.value = data.items.map(item => ({
+      componentTypes.value = data.items.map((item) => ({
         ...item,
-        description: item.description ?? item.notes ?? null
+        structure: item.structure as ComponentModelStructure | null,
+        description: item.description ?? item.notes ?? null,
       }))
 
       return { success: true, data: componentTypes.value }
     } catch (error) {
-      const message = error?.message || 'Erreur inconnue'
+      const err = error as Error & { message?: string }
+      const message = err?.message || 'Erreur inconnue'
       showError(`Impossible de charger les types de composant: ${message}`)
       return { success: false, error: message }
     } finally {
@@ -43,21 +65,22 @@ export function useComponentTypes () {
     }
   }
 
-  const createComponentType = async (payload) => {
+  const createComponentType = async (payload: ComponentTypePayload): Promise<ComponentTypeResult> => {
     loadingComponentTypes.value = true
     try {
       const data = await createModelType({
         name: payload.name,
         code: payload.code || generateCodeFromName(payload.name),
         category: 'COMPONENT',
-        notes: payload.description ?? payload.notes,
-        description: payload.description ?? null,
-        structure: payload.structure
+        notes: payload.description ?? payload.notes ?? undefined,
+        description: payload.description ?? undefined,
+        structure: payload.structure ?? undefined,
       })
 
-      const normalized = {
+      const normalized: ComponentType = {
         ...data,
-        description: data.description ?? data.notes ?? null
+        structure: data.structure as ComponentModelStructure | null,
+        description: data.description ?? data.notes ?? null,
       }
 
       componentTypes.value.push(normalized)
@@ -65,7 +88,8 @@ export function useComponentTypes () {
 
       return { success: true, data: normalized }
     } catch (error) {
-      const message = error?.data?.message || error?.message || 'Erreur inconnue'
+      const err = error as Error & { data?: { message?: string }; message?: string }
+      const message = err?.data?.message || err?.message || 'Erreur inconnue'
       showError(`Erreur lors de la création du type de composant: ${message}`)
       return { success: false, error: message }
     } finally {
@@ -73,34 +97,33 @@ export function useComponentTypes () {
     }
   }
 
-  const updateComponentType = async (id, payload) => {
+  const updateComponentType = async (id: string, payload: ComponentTypePayload): Promise<ComponentTypeResult> => {
     loadingComponentTypes.value = true
     try {
       const data = await updateModelType(id, {
         name: payload.name,
-        description: payload.description,
-        notes: payload.notes,
+        description: payload.description ?? undefined,
+        notes: payload.notes ?? undefined,
         code: payload.code,
-        structure: payload.structure
+        structure: payload.structure ?? undefined,
       })
 
-      const normalized = {
+      const normalized: ComponentType = {
         ...data,
-        description: data.description ?? data.notes ?? null
+        structure: data.structure as ComponentModelStructure | null,
+        description: data.description ?? data.notes ?? null,
       }
 
-      const index = componentTypes.value.findIndex(type => type.id === id)
+      const index = componentTypes.value.findIndex((type) => type.id === id)
       if (index !== -1) {
         componentTypes.value[index] = normalized
       }
       showSuccess(`Type de composant "${data.name}" mis à jour`)
 
-      return {
-        success: true,
-        data: normalized
-      }
+      return { success: true, data: normalized }
     } catch (error) {
-      const message = error?.data?.message || error?.message || 'Erreur inconnue'
+      const err = error as Error & { data?: { message?: string }; message?: string }
+      const message = err?.data?.message || err?.message || 'Erreur inconnue'
       showError(`Erreur lors de la mise à jour du type de composant: ${message}`)
       return { success: false, error: message }
     } finally {
@@ -108,15 +131,16 @@ export function useComponentTypes () {
     }
   }
 
-  const deleteComponentType = async (id) => {
+  const deleteComponentType = async (id: string): Promise<ComponentTypeResult> => {
     loadingComponentTypes.value = true
     try {
       await deleteModelType(id)
-      componentTypes.value = componentTypes.value.filter(type => type.id !== id)
+      componentTypes.value = componentTypes.value.filter((type) => type.id !== id)
       showSuccess('Type de composant supprimé')
       return { success: true }
     } catch (error) {
-      const message = error?.data?.message || error?.message || 'Erreur inconnue'
+      const err = error as Error & { data?: { message?: string }; message?: string }
+      const message = err?.data?.message || err?.message || 'Erreur inconnue'
       showError(`Erreur lors de la suppression du type de composant: ${message}`)
       return { success: false, error: message }
     } finally {
@@ -135,6 +159,6 @@ export function useComponentTypes () {
     updateComponentType,
     deleteComponentType,
     getComponentTypes,
-    isComponentTypeLoading
+    isComponentTypeLoading,
   }
 }
diff --git a/app/composables/useComposants.js b/app/composables/useComposants.ts
similarity index 54%
rename from app/composables/useComposants.js
rename to app/composables/useComposants.ts
index 138ccb8..e9e9bce 100644
--- a/app/composables/useComposants.js
+++ b/app/composables/useComposants.ts
@@ -2,45 +2,83 @@ import { ref } from 'vue'
 import { useToast } from './useToast'
 import { useApi } from './useApi'
 import { buildConstructeurRequestPayload, uniqueConstructeurIds } from '~/shared/constructeurUtils'
-import { useConstructeurs } from './useConstructeurs'
+import { useConstructeurs, type Constructeur } from './useConstructeurs'
 import { extractRelationId, normalizeRelationIds } from '~/shared/apiRelations'
 
-const composants = ref([])
+export interface Composant {
+  id: string
+  name: string
+  reference?: string | null
+  typeComposantId?: string | null
+  typeComposant?: { id: string; name?: string } | null
+  productId?: string | null
+  product?: { id: string; name?: string } | null
+  constructeurs?: Constructeur[]
+  constructeurIds?: string[]
+  documents?: unknown[]
+  createdAt?: string | null
+  updatedAt?: string | null
+  [key: string]: unknown
+}
+
+interface ComposantListResult {
+  success: boolean
+  data?: { items: Composant[]; total: number; page: number; itemsPerPage: number }
+  error?: string
+}
+
+interface ComposantSingleResult {
+  success: boolean
+  data?: Composant
+  error?: string
+}
+
+interface LoadComposantsOptions {
+  search?: string
+  page?: number
+  itemsPerPage?: number
+  orderBy?: string
+  orderDir?: 'asc' | 'desc'
+}
+
+const composants = ref<Composant[]>([])
 const total = ref(0)
 const loading = ref(false)
 
-const extractCollection = (payload) => {
+const extractCollection = (payload: unknown): Composant[] => {
   if (Array.isArray(payload)) {
-    return payload
+    return payload as Composant[]
   }
-  if (Array.isArray(payload?.member)) {
-    return payload.member
+  const p = payload as Record<string, unknown> | null
+  if (Array.isArray(p?.member)) {
+    return p.member as Composant[]
   }
-  if (Array.isArray(payload?.['hydra:member'])) {
-    return payload['hydra:member']
+  if (Array.isArray(p?.['hydra:member'])) {
+    return p['hydra:member'] as Composant[]
   }
-  if (Array.isArray(payload?.data)) {
-    return payload.data
+  if (Array.isArray(p?.data)) {
+    return p.data as Composant[]
   }
   return []
 }
 
-const extractTotal = (payload, fallbackLength) => {
-  if (typeof payload?.totalItems === 'number') {
-    return payload.totalItems
+const extractTotal = (payload: unknown, fallbackLength: number): number => {
+  const p = payload as Record<string, unknown> | null
+  if (typeof p?.totalItems === 'number') {
+    return p.totalItems
   }
-  if (typeof payload?.['hydra:totalItems'] === 'number') {
-    return payload['hydra:totalItems']
+  if (typeof p?.['hydra:totalItems'] === 'number') {
+    return p['hydra:totalItems']
   }
   return fallbackLength
 }
 
-export function useComposants () {
-  const { showSuccess, showError, showInfo } = useToast()
+export function useComposants() {
+  const { showSuccess } = useToast()
   const { get, post, patch, delete: del } = useApi()
   const { ensureConstructeurs } = useConstructeurs()
 
-  const withResolvedConstructeurs = async (composant) => {
+  const withResolvedConstructeurs = async (composant: Composant): Promise<Composant> => {
     if (!composant || typeof composant !== 'object') {
       return composant
     }
@@ -59,12 +97,11 @@ export function useComposants () {
     const ids = uniqueConstructeurIds(
       composant.constructeurIds,
       composant.constructeurs,
-      composant.constructeur,
     )
     const hasResolvedConstructeurs =
-      Array.isArray(composant.constructeurs)
-      && composant.constructeurs.length > 0
-      && composant.constructeurs.every((item) => item && typeof item === 'object')
+      Array.isArray(composant.constructeurs) &&
+      composant.constructeurs.length > 0 &&
+      composant.constructeurs.every((item) => item && typeof item === 'object')
 
     if (ids.length && !hasResolvedConstructeurs) {
       const resolved = await ensureConstructeurs(ids)
@@ -76,16 +113,7 @@ export function useComposants () {
     return composant
   }
 
-  /**
-   * Load composants with pagination and search support
-   * @param {Object} options - Query options
-   * @param {string} [options.search] - Search term for name/reference
-   * @param {number} [options.page=1] - Current page (1-based)
-   * @param {number} [options.itemsPerPage=30] - Items per page
-   * @param {string} [options.orderBy='name'] - Field to order by
-   * @param {string} [options.orderDir='asc'] - Order direction (asc/desc)
-   */
-  const loadComposants = async (options = {}) => {
+  const loadComposants = async (options: LoadComposantsOptions = {}): Promise<ComposantListResult> => {
     loading.value = true
     try {
       const {
@@ -93,7 +121,7 @@ export function useComposants () {
         page = 1,
         itemsPerPage = 30,
         orderBy = 'name',
-        orderDir = 'asc'
+        orderDir = 'asc',
       } = options
 
       const params = new URLSearchParams()
@@ -118,79 +146,84 @@ export function useComposants () {
             items: enrichedItems,
             total: total.value,
             page,
-            itemsPerPage
-          }
+            itemsPerPage,
+          },
         }
       }
-      return result
+      return result as ComposantListResult
     } catch (error) {
       console.error('Erreur lors du chargement des composants:', error)
-      return { success: false, error: error.message }
+      return { success: false, error: (error as Error).message }
     } finally {
       loading.value = false
     }
   }
 
-  const createComposant = async (composantData) => {
+  const createComposant = async (composantData: Partial<Composant>): Promise<ComposantSingleResult> => {
     loading.value = true
     try {
       const normalizedPayload = normalizeRelationIds(buildConstructeurRequestPayload(composantData))
       const result = await post('/composants', normalizedPayload)
-      if (result.success) {
-        const enriched = await withResolvedConstructeurs(result.data)
+      if (result.success && result.data) {
+        const enriched = await withResolvedConstructeurs(result.data as Composant)
         composants.value.unshift(enriched)
         total.value += 1
-        const displayName = result.data?.name
-          || composantData?.definition?.name
-          || composantData?.name
-          || 'Composant'
+        const definition = (composantData as Record<string, unknown>)?.definition as Record<string, unknown> | undefined
+        const displayName =
+          (result.data as Composant)?.name ||
+          (definition?.name as string | undefined) ||
+          composantData?.name ||
+          'Composant'
         showSuccess(`Composant "${displayName}" créé avec succès`)
+        return { success: true, data: enriched }
       }
-      return result
+      return { success: false, error: result.error }
     } catch (error) {
       console.error('Erreur lors de la création du composant:', error)
-      return { success: false, error: error.message }
+      return { success: false, error: (error as Error).message }
     } finally {
       loading.value = false
     }
   }
 
-  const updateComposantData = async (id, composantData) => {
+  const updateComposantData = async (id: string, composantData: Partial<Composant>): Promise<ComposantSingleResult> => {
     loading.value = true
     try {
       const normalizedPayload = normalizeRelationIds(buildConstructeurRequestPayload(composantData))
       const result = await patch(`/composants/${id}`, normalizedPayload)
-      if (result.success) {
-        const updated = await withResolvedConstructeurs(result.data)
-        const index = composants.value.findIndex(comp => comp.id === id)
+      if (result.success && result.data) {
+        const updated = await withResolvedConstructeurs(result.data as Composant)
+        const index = composants.value.findIndex((comp) => comp.id === id)
         if (index !== -1) {
           composants.value[index] = updated
         }
         showSuccess(`Composant "${updated?.name || composantData.name || ''}" mis à jour avec succès`)
+        return { success: true, data: updated }
       }
-      return result
+      return { success: false, error: result.error }
     } catch (error) {
       console.error('Erreur lors de la mise à jour du composant:', error)
-      return { success: false, error: error.message }
+      return { success: false, error: (error as Error).message }
     } finally {
       loading.value = false
     }
   }
 
-  const deleteComposant = async (id) => {
+  const deleteComposant = async (id: string): Promise<ComposantSingleResult> => {
     loading.value = true
     try {
       const result = await del(`/composants/${id}`)
       if (result.success) {
-        const deletedComposant = composants.value.find(comp => comp.id === id)
-        composants.value = composants.value.filter(comp => comp.id !== id)
+        const deletedComposant = composants.value.find((comp) => comp.id === id)
+        composants.value = composants.value.filter((comp) => comp.id !== id)
         total.value = Math.max(0, total.value - 1)
         showSuccess(`Composant "${deletedComposant?.name || 'inconnu'}" supprimé avec succès`)
+        return { success: true }
       }
-      return result
+      return { success: false, error: result.error }
     } catch (error) {
       console.error('Erreur lors de la suppression du composant:', error)
-      return { success: false, error: error.message }
+      return { success: false, error: (error as Error).message }
     } finally {
       loading.value = false
     }
@@ -208,6 +241,6 @@ export function useComposants () {
     updateComposant: updateComposantData,
     deleteComposant,
     getComposants,
-    isLoading
+    isLoading,
   }
 }
diff --git a/app/composables/useConstructeurs.js b/app/composables/useConstructeurs.ts
similarity index 58%
rename from app/composables/useConstructeurs.js
rename to app/composables/useConstructeurs.ts
index 67a2996..7da2c76 100644
--- a/app/composables/useConstructeurs.js
+++ b/app/composables/useConstructeurs.ts
@@ -2,11 +2,24 @@ import { ref } from 'vue'
 import { useApi } from './useApi'
 import { useToast } from './useToast'
 
-const constructeurs = ref([])
+export interface Constructeur {
+  id: string
+  name: string
+  email?: string | null
+  phone?: string | null
+}
+
+interface ConstructeurResult {
+  success: boolean
+  data?: Constructeur | Constructeur[]
+  error?: string
+}
+
+const constructeurs = ref<Constructeur[]>([])
 const loading = ref(false)
 
-const uniqueConstructeurs = (items = []) => {
-  const map = new Map()
+const uniqueConstructeurs = (items: Constructeur[] = []): Constructeur[] => {
+  const map = new Map<string, Constructeur>()
   items.forEach((item) => {
     if (item && typeof item === 'object' && typeof item.id === 'string') {
       map.set(item.id, item)
@@ -15,7 +28,7 @@ const uniqueConstructeurs = (items = []) => {
   return Array.from(map.values())
 }
 
-const normalizeIds = (ids = []) => {
+const normalizeIds = (ids: unknown[] = []): string[] => {
   if (!Array.isArray(ids)) {
     return []
   }
@@ -28,7 +41,7 @@ const normalizeIds = (ids = []) => {
   )
 }
 
-const upsertConstructeurs = (items = []) => {
+const upsertConstructeurs = (items: Constructeur[] = []) => {
   if (!Array.isArray(items) || !items.length) {
     return
   }
@@ -36,32 +49,33 @@ const upsertConstructeurs = (items = []) => {
   constructeurs.value = merged
 }
 
-const getIndexedConstructeur = (id) =>
+const getIndexedConstructeur = (id: string): Constructeur | null =>
   constructeurs.value.find((item) => item && item.id === id) || null
 
-const extractCollection = (payload) => {
+const extractCollection = (payload: unknown): Constructeur[] => {
   if (Array.isArray(payload)) {
-    return payload
+    return payload as Constructeur[]
   }
-  if (Array.isArray(payload?.member)) {
-    return payload.member
+  const p = payload as Record<string, unknown> | null
+  if (Array.isArray(p?.member)) {
+    return p.member as Constructeur[]
   }
-  if (Array.isArray(payload?.['hydra:member'])) {
-    return payload['hydra:member']
+  if (Array.isArray(p?.['hydra:member'])) {
+    return p['hydra:member'] as Constructeur[]
   }
-  if (Array.isArray(payload?.data)) {
-    return payload.data
+  if (Array.isArray(p?.data)) {
+    return p.data as Constructeur[]
   }
   return []
 }
 
-const pendingFetches = new Map()
+const pendingFetches = new Map<string, Promise<Constructeur | null>>()
 
-export function useConstructeurs () {
+export function useConstructeurs() {
   const { get, post, patch, delete: del } = useApi()
   const { showSuccess, showError } = useToast()
 
-  const loadConstructeurs = async (search = '') => {
+  const loadConstructeurs = async (search = ''): Promise<ConstructeurResult> => {
     loading.value = true
     try {
       const query = search ? `?search=${encodeURIComponent(search)}` : ''
@@ -70,47 +84,49 @@ export function useConstructeurs () {
         const items = extractCollection(result.data)
         constructeurs.value = uniqueConstructeurs(items)
       }
-      return result
+      return result as ConstructeurResult
     } catch (error) {
+      const err = error as Error
       console.error('Erreur lors du chargement des fournisseurs:', error)
-      return { success: false, error: error.message }
+      return { success: false, error: err.message }
     } finally {
       loading.value = false
     }
   }
 
-  const searchConstructeurs = async (search = '') => {
+  const searchConstructeurs = async (search = ''): Promise<ConstructeurResult> => {
     return loadConstructeurs(search)
   }
 
-  const createConstructeur = async (data) => {
+  const createConstructeur = async (data: Partial<Constructeur>): Promise<ConstructeurResult> => {
     loading.value = true
     try {
       const result = await post('/constructeurs', data)
       if (result.success) {
-        upsertConstructeurs([result.data])
-        showSuccess(`Fournisseur "${result.data.name}" créé`)
+        upsertConstructeurs([result.data as Constructeur])
+        showSuccess(`Fournisseur "${(result.data as Constructeur).name}" créé`)
       } else if (result.error) {
         showError(result.error)
       }
-      return result
+      return result as ConstructeurResult
     } catch (error) {
+      const err = error as Error
       console.error('Erreur lors de la création du fournisseur:', error)
       showError('Impossible de créer le fournisseur')
-      return { success: false, error: error.message }
+      return { success: false, error: err.message }
     } finally {
       loading.value = false
     }
   }
 
-  const ensureConstructeurs = async (ids = []) => {
+  const ensureConstructeurs = async (ids: unknown[] = []): Promise<Constructeur[]> => {
     const normalizedIds = normalizeIds(ids)
     if (!normalizedIds.length) {
       return []
     }
 
-    const collected = []
-    const missing = []
+    const collected: Constructeur[] = []
+    const missing: string[] = []
     normalizedIds.forEach((id) => {
       const existing = getIndexedConstructeur(id)
       if (existing) {
@@ -129,7 +145,7 @@ export function useConstructeurs () {
         const task = get(`/constructeurs/${id}`)
           .then((result) => {
             if (result.success && result.data) {
-              return result.data
+              return result.data as Constructeur
             }
             return null
           })
@@ -145,7 +161,7 @@ export function useConstructeurs () {
       })
 
       const fetched = await Promise.all(fetchTasks)
-      const validFetched = fetched.filter((item) => item && item.id)
+      const validFetched = fetched.filter((item): item is Constructeur => item !== null && item.id !== undefined)
       if (validFetched.length) {
         upsertConstructeurs(validFetched)
       }
@@ -153,50 +169,52 @@ export function useConstructeurs () {
 
     return normalizedIds
       .map((id) => getIndexedConstructeur(id))
-      .filter((item) => Boolean(item))
+      .filter((item): item is Constructeur => item !== null)
   }
 
-  const updateConstructeur = async (id, data) => {
+  const updateConstructeur = async (id: string, data: Partial<Constructeur>): Promise<ConstructeurResult> => {
     loading.value = true
     try {
       const result = await patch(`/constructeurs/${id}`, data)
       if (result.success) {
-        upsertConstructeurs([result.data])
-        showSuccess(`Fournisseur "${result.data.name}" mis à jour`)
+        upsertConstructeurs([result.data as Constructeur])
+        showSuccess(`Fournisseur "${(result.data as Constructeur).name}" mis à jour`)
       } else if (result.error) {
         showError(result.error)
       }
-      return result
+      return result as ConstructeurResult
     } catch (error) {
+      const err = error as Error
       console.error('Erreur lors de la mise à jour du fournisseur:', error)
       showError('Impossible de mettre à jour le fournisseur')
-      return { success: false, error: error.message }
+      return { success: false, error: err.message }
     } finally {
       loading.value = false
     }
   }
 
-  const deleteConstructeur = async (id) => {
+  const deleteConstructeur = async (id: string): Promise<ConstructeurResult> => {
     loading.value = true
     try {
       const result = await del(`/constructeurs/${id}`)
       if (result.success) {
-        constructeurs.value = constructeurs.value.filter(item => item.id !== id)
+        constructeurs.value = constructeurs.value.filter((item) => item.id !== id)
         showSuccess('Fournisseur supprimé')
       } else if (result.error) {
         showError(result.error)
       }
-      return result
+      return result as ConstructeurResult
     } catch (error) {
+      const err = error as Error
       console.error('Erreur lors de la suppression du fournisseur:', error)
       showError('Impossible de supprimer le fournisseur')
-      return { success: false, error: error.message }
+      return { success: false, error: err.message }
     } finally {
       loading.value = false
     }
   }
 
-  const getConstructeurById = (id) => getIndexedConstructeur(id)
+  const getConstructeurById = (id: string) => getIndexedConstructeur(id)
 
   return {
     constructeurs,
diff --git a/app/composables/useDocuments.js b/app/composables/useDocuments.js
deleted file mode 100644
index 8177fe2..0000000
--- a/app/composables/useDocuments.js
+++ /dev/null
@@ -1,169 +0,0 @@
-import { ref } from 'vue'
-import { useApi } from './useApi'
-import { useToast } from './useToast'
-import { normalizeRelationIds } from '~/shared/apiRelations'
-
-const documents = ref([])
-const loading = ref(false)
-
-const extractCollection = (payload) => {
-  if (Array.isArray(payload)) {
-    return payload
-  }
-  if (Array.isArray(payload?.member)) {
-    return payload.member
-  }
-  if (Array.isArray(payload?.['hydra:member'])) {
-    return payload['hydra:member']
-  }
-  if (Array.isArray(payload?.data)) {
-    return payload.data
-  }
-  return []
-}
-
-const fileToBase64 = file =>
-  new Promise((resolve, reject) => {
-    const reader = new FileReader()
-    reader.onload = () => resolve(reader.result)
-    reader.onerror = () => reject(new Error(`Lecture du fichier ${file.name} impossible`))
-    reader.readAsDataURL(file)
-  })
-
-export function useDocuments () {
-  const { get, post, delete: del } = useApi()
-  const { showError, showSuccess } = useToast()
-
-  const loadFromEndpoint = async (endpoint, { updateStore = false } = {}) => {
-    loading.value = true
-    try {
-      const result = await get(endpoint)
-      if (result.success) {
-        const data = extractCollection(result.data)
-        if (updateStore) {
-          documents.value = data
-        }
-        return { success: true, data }
-      }
-      if (result.error) {
-        showError(result.error)
-      }
-      return result
-    } catch (error) {
-      console.error(`Erreur lors du chargement des documents (${endpoint}):`, error)
-      showError('Impossible de charger les documents')
-      return { success: false, error: error.message }
-    } finally {
-      loading.value = false
-    }
-  }
-
-  const loadDocuments = async (options = {}) => {
-    return loadFromEndpoint('/documents', { updateStore: options.updateStore ?? true })
-  }
-
-  const loadDocumentsBySite = async (siteId, options = {}) => {
-    if (!siteId) { return { success: false, error: 'Aucun site sélectionné' } }
-    return loadFromEndpoint(`/documents/site/${siteId}`, { updateStore: options.updateStore ?? false })
-  }
-
-  const loadDocumentsByMachine = async (machineId, options = {}) => {
-    if (!machineId) { return { success: false, error: 'Aucune machine sélectionnée' } }
-    return loadFromEndpoint(`/documents/machine/${machineId}`, { updateStore: options.updateStore ?? false })
-  }
-
-  const loadDocumentsByComponent = async (componentId, options = {}) => {
-    if (!componentId) { return { success: false, error: 'Aucun composant sélectionné' } }
-    return loadFromEndpoint(`/documents/composant/${componentId}`, { updateStore: options.updateStore ?? false })
-  }
-
-  const loadDocumentsByProduct = async (productId, options = {}) => {
-    if (!productId) { return { success: false, error: 'Aucun produit sélectionné' } }
-    return loadFromEndpoint(`/documents/product/${productId}`, { updateStore: options.updateStore ?? false })
-  }
-
-  const loadDocumentsByPiece = async (pieceId, options = {}) => {
-    if (!pieceId) { return { success: false, error: 'Aucune pièce sélectionnée' } }
-    return loadFromEndpoint(`/documents/piece/${pieceId}`, { updateStore: options.updateStore ?? false })
-  }
-
-  const uploadDocuments = async ({ files = [], context = {} }, { updateStore = false } = {}) => {
-    if (!files.length) { return { success: false, error: 'Aucun fichier sélectionné' } }
-
-    loading.value = true
-    const created = []
-
-    try {
-      for (const file of files) {
-        const dataUrl = await fileToBase64(file)
-
-        const payload = normalizeRelationIds({
-          name: file.name,
-          filename: file.name,
-          mimeType: file.type || 'application/octet-stream',
-          size: file.size,
-          path: dataUrl,
-          ...context
-        })
-
-        const result = await post('/documents', payload)
-        if (result.success) {
-          created.push(result.data)
-          showSuccess(`Document "${file.name}" ajouté`)
-        } else if (result.error) {
-          showError(`Erreur sur ${file.name} : ${result.error}`)
-        }
-      }
-
-      if (created.length) {
-        if (updateStore) {
-          documents.value = [...created, ...documents.value]
-        }
-        return { success: true, data: created }
-      }
-
-      return { success: false, error: 'Aucun document ajouté' }
-    } catch (error) {
-      console.error('Erreur lors de l\'upload des documents:', error)
-      showError("Échec de l'ajout des documents")
-      return { success: false, error: error.message }
-    } finally {
-      loading.value = false
-    }
-  }
-
-  const deleteDocument = async (id, { updateStore = false } = {}) => {
-    if (!id) { return { success: false, error: 'Identifiant manquant' } }
-
-    loading.value = true
-    try {
-      const result = await del(`/documents/${id}`)
-      if (result.success) {
-        if (updateStore) {
-          documents.value = documents.value.filter(doc => doc.id !== id)
-        }
-        showSuccess('Document supprimé')
-      }
-      return result
-    } catch (error) {
-      console.error('Erreur lors de la suppression du document:', error)
-      showError('Impossible de supprimer le document')
-      return { success: false, error: error.message }
-    } finally {
-      loading.value = false
-    }
-  }
-
-  return {
-    documents,
-    loading,
-    loadDocuments,
-    loadDocumentsBySite,
-    loadDocumentsByMachine,
-    loadDocumentsByComponent,
-    loadDocumentsByPiece,
-    loadDocumentsByProduct,
-    uploadDocuments,
-    deleteDocument
-  }
-}
diff --git a/app/composables/useDocuments.ts b/app/composables/useDocuments.ts
new file mode 100644
index 0000000..c513b12
--- /dev/null
+++ b/app/composables/useDocuments.ts
@@ -0,0 +1,241 @@
+import { ref } from 'vue'
+import { useApi } from './useApi'
+import { useToast } from './useToast'
+import { normalizeRelationIds } from '~/shared/apiRelations'
+
+export interface Document {
+  id: string
+  name: string
+  filename: string
+  mimeType: string
+  size: number
+  path: string
+  siteId?: string
+  machineId?: string
+  composantId?: string
+  productId?: string
+  pieceId?: string
+}
+
+export interface UploadContext {
+  siteId?: string
+  machineId?: string
+  composantId?: string
+  productId?: string
+  pieceId?: string
+}
+
+export interface DocumentResult {
+  success: boolean
+  data?: Document | Document[]
+  error?: string
+}
+
+const documents = ref<Document[]>([])
+const loading = ref(false)
+
+const extractCollection = (payload: unknown): Document[] => {
+  if (Array.isArray(payload)) {
+    return payload
+  }
+  const p = payload as Record<string, unknown> | null
+  if (Array.isArray(p?.member)) {
+    return p.member as Document[]
+  }
+  if (Array.isArray(p?.['hydra:member'])) {
+    return p['hydra:member'] as Document[]
+  }
+  if (Array.isArray(p?.data)) {
+    return p.data as Document[]
+  }
+  return []
+}
+
+const fileToBase64 = (file: File): Promise<string> =>
+  new Promise((resolve, reject) => {
+    const reader = new FileReader()
+    reader.onload = () => resolve(reader.result as string)
+    reader.onerror = () => reject(new Error(`Lecture du fichier ${file.name} impossible`))
+    reader.readAsDataURL(file)
+  })
+
+export function useDocuments() {
+  const { get, post, delete: del } = useApi()
+  const { showError, showSuccess } = useToast()
+
+  const loadFromEndpoint = async (
+    endpoint: string,
+    { updateStore = false }: { updateStore?: boolean } = {},
+  ): Promise<DocumentResult> => {
+    loading.value = true
+    try {
+      const result = await get(endpoint)
+      if (result.success) {
+        const data = extractCollection(result.data)
+        if (updateStore) {
+          documents.value = data
+        }
+        return { success: true, data }
+      }
+      if (result.error) {
+        showError(result.error)
+      }
+      return result as DocumentResult
+    } catch (error) {
+      const err = error as Error
+      console.error(`Erreur lors du chargement des documents (${endpoint}):`, error)
+      showError('Impossible de charger les documents')
+      return { success: false, error: err.message }
+    } finally {
+      loading.value = false
+    }
+  }
+
+  const loadDocuments = async (
+    options: { updateStore?: boolean } = {},
+  ): Promise<DocumentResult> => {
+    return loadFromEndpoint('/documents', { updateStore: options.updateStore ?? true })
+  }
+
+  const loadDocumentsBySite = async (
+    siteId: string,
+    options: { updateStore?: boolean } = {},
+  ): Promise<DocumentResult> => {
+    if (!siteId) {
+      return { success: false, error: 'Aucun site sélectionné' }
+    }
+    return loadFromEndpoint(`/documents/site/${siteId}`, { updateStore: options.updateStore ?? false })
+  }
+
+  const loadDocumentsByMachine = async (
+    machineId: string,
+    options: { updateStore?: boolean } = {},
+  ): Promise<DocumentResult> => {
+    if (!machineId) {
+      return { success: false, error: 'Aucune machine sélectionnée' }
+    }
+    return loadFromEndpoint(`/documents/machine/${machineId}`, { updateStore: options.updateStore ?? false })
+  }
+
+  const loadDocumentsByComponent = async (
+    componentId: string,
+    options: { updateStore?: boolean } = {},
+  ): Promise<DocumentResult> => {
+    if (!componentId) {
+      return { success: false, error: 'Aucun composant sélectionné' }
+    }
+    return loadFromEndpoint(`/documents/composant/${componentId}`, { updateStore: options.updateStore ?? false })
+  }
+
+  const loadDocumentsByProduct = async (
+    productId: string,
+    options: { updateStore?: boolean } = {},
+  ): Promise<DocumentResult> => {
+    if (!productId) {
+      return { success: false, error: 'Aucun produit sélectionné' }
+    }
+    return loadFromEndpoint(`/documents/product/${productId}`, { updateStore: options.updateStore ?? false })
+  }
+
+  const loadDocumentsByPiece = async (
+    pieceId: string,
+    options: { updateStore?: boolean } = {},
+  ): Promise<DocumentResult> => {
+    if (!pieceId) {
+      return { success: false, error: 'Aucune pièce sélectionnée' }
+    }
+    return loadFromEndpoint(`/documents/piece/${pieceId}`, { updateStore: options.updateStore ?? false })
+  }
+
+  const uploadDocuments = async (
+    { files, context = {} }: { files: File[]; context?: UploadContext },
+    { updateStore = false }: { updateStore?: boolean } = {},
+  ): Promise<DocumentResult> => {
+    if (!files.length) {
+      return { success: false, error: 'Aucun fichier sélectionné' }
+    }
+
+    loading.value = true
+    const created: Document[] = []
+
+    try {
+      for (const file of files) {
+        const dataUrl = await fileToBase64(file)
+
+        const payload = normalizeRelationIds({
+          name: file.name,
+          filename: file.name,
+          mimeType: file.type || 'application/octet-stream',
+          size: file.size,
+          path: dataUrl,
+          ...context,
+        })
+
+        const result = await post('/documents', payload)
+        if (result.success) {
+          created.push(result.data as Document)
+          showSuccess(`Document "${file.name}" ajouté`)
+        } else if (result.error) {
+          showError(`Erreur sur ${file.name} : ${result.error}`)
+        }
+      }
+
+      if (created.length) {
+        if (updateStore) {
+          documents.value = [...created, ...documents.value]
+        }
+        return { success: true, data: created }
+      }
+
+      return { success: false, error: 'Aucun document ajouté' }
+    } catch (error) {
+      const err = error as Error
+      console.error("Erreur lors de l'upload des documents:", error)
+      showError("Échec de l'ajout des documents")
+      return { success: false, error: err.message }
+    } finally {
+      loading.value = false
+    }
+  }
+
+  const deleteDocument = async (
+    id: string | number,
+    { updateStore = false }: { updateStore?: boolean } = {},
+  ): Promise<DocumentResult> => {
+    if (!id) {
+      return { success: false, error: 'Identifiant manquant' }
+    }
+
+    loading.value = true
+    try {
+      const result = await del(`/documents/${id}`)
+      if (result.success) {
+        if (updateStore) {
+          documents.value = documents.value.filter((doc) => doc.id !== id)
+        }
+        showSuccess('Document supprimé')
+      }
+      return result as DocumentResult
+    } catch (error) {
+      const err = error as Error
+      console.error('Erreur lors de la suppression du document:', error)
+      showError('Impossible de supprimer le document')
+      return { success: false, error: err.message }
+    } finally {
+      loading.value = false
+    }
+  }
+
+  return {
+    documents,
+    loading,
+    loadDocuments,
+    loadDocumentsBySite,
+    loadDocumentsByMachine,
+    loadDocumentsByComponent,
+    loadDocumentsByPiece,
+    loadDocumentsByProduct,
+    uploadDocuments,
+    deleteDocument,
+  }
+}
diff --git a/app/composables/usePieceTypes.js b/app/composables/usePieceTypes.ts
similarity index 50%
rename from app/composables/usePieceTypes.js
rename to app/composables/usePieceTypes.ts
index d35dd5f..b44898f 100644
--- a/app/composables/usePieceTypes.js
+++ b/app/composables/usePieceTypes.ts
@@ -1,14 +1,34 @@
 import { ref } from 'vue'
 import { useToast } from './useToast'
-import { listModelTypes, createModelType, updateModelType, deleteModelType } from '~/services/modelTypes'
+import { listModelTypes, createModelType, updateModelType, deleteModelType, type ModelType } from '~/services/modelTypes'
+import type { PieceModelStructure } from '~/shared/types/inventory'
 
-const pieceTypes = ref([])
+export interface PieceType extends ModelType {
+  structure: PieceModelStructure | null
+  description?: string | null
+}
+
+interface PieceTypePayload {
+  name: string
+  code?: string
+  description?: string | null
+  notes?: string | null
+  structure?: PieceModelStructure | null
+}
+
+interface PieceTypeResult {
+  success: boolean
+  data?: PieceType | PieceType[]
+  error?: string
+}
+
+const pieceTypes = ref<PieceType[]>([])
 const loadingPieceTypes = ref(false)
 
-export function usePieceTypes () {
+export function usePieceTypes() {
   const { showSuccess, showError } = useToast()
 
-  const generateCodeFromName = (name) => {
+  const generateCodeFromName = (name: string): string => {
     return (name || '')
       .normalize('NFD')
       .replace(/[\u0300-\u036F]/g, '')
@@ -18,24 +38,26 @@ export function usePieceTypes () {
       .replace(/-+/g, '-') || 'type'
   }
 
-  const loadPieceTypes = async () => {
+  const loadPieceTypes = async (): Promise<PieceTypeResult> => {
     loadingPieceTypes.value = true
     try {
       const data = await listModelTypes({
         category: 'PIECE',
         sort: 'name',
         dir: 'asc',
-        limit: 200
+        limit: 200,
       })
 
-      pieceTypes.value = data.items.map(item => ({
+      pieceTypes.value = data.items.map((item) => ({
         ...item,
-        description: item.description ?? item.notes ?? null
+        structure: item.structure as PieceModelStructure | null,
+        description: item.description ?? item.notes ?? null,
       }))
 
       return { success: true, data: pieceTypes.value }
     } catch (error) {
-      const message = error?.message || 'Erreur inconnue'
+      const err = error as Error & { message?: string }
+      const message = err?.message || 'Erreur inconnue'
       showError(`Impossible de charger les types de pièce: ${message}`)
       return { success: false, error: message }
     } finally {
@@ -43,21 +65,22 @@ export function usePieceTypes () {
     }
   }
 
-  const createPieceType = async (payload) => {
+  const createPieceType = async (payload: PieceTypePayload): Promise<PieceTypeResult> => {
     loadingPieceTypes.value = true
     try {
       const data = await createModelType({
         name: payload.name,
         code: payload.code || generateCodeFromName(payload.name),
         category: 'PIECE',
-        notes: payload.description ?? payload.notes,
-        description: payload.description ?? null,
-        structure: payload.structure
+        notes: payload.description ?? payload.notes ?? undefined,
+        description: payload.description ?? undefined,
+        structure: payload.structure ?? undefined,
       })
 
-      const normalized = {
+      const normalized: PieceType = {
         ...data,
-        description: data.description ?? data.notes ?? null
+        structure: data.structure as PieceModelStructure | null,
+        description: data.description ?? data.notes ?? null,
       }
 
       pieceTypes.value.push(normalized)
@@ -65,7 +88,8 @@ export function usePieceTypes () {
 
       return { success: true, data: normalized }
     } catch (error) {
-      const message = error?.data?.message || error?.message || 'Erreur inconnue'
+      const err = error as Error & { data?: { message?: string }; message?: string }
+      const message = err?.data?.message || err?.message || 'Erreur inconnue'
       showError(`Erreur lors de la création du type de pièce: ${message}`)
       return { success: false, error: message }
     } finally {
@@ -73,34 +97,33 @@ export function usePieceTypes () {
     }
   }
 
-  const updatePieceType = async (id, payload) => {
+  const updatePieceType = async (id: string, payload: PieceTypePayload): Promise<PieceTypeResult> => {
     loadingPieceTypes.value = true
     try {
       const data = await updateModelType(id, {
         name: payload.name,
-        description: payload.description,
-        notes: payload.notes,
+        description: payload.description ?? undefined,
+        notes: payload.notes ?? undefined,
         code: payload.code,
-        structure: payload.structure
+        structure: payload.structure ?? undefined,
       })
 
-      const normalized = {
+      const normalized: PieceType = {
         ...data,
-        description: data.description ?? data.notes ?? null
+        structure: data.structure as PieceModelStructure | null,
+        description: data.description ?? data.notes ?? null,
       }
 
-      const index = pieceTypes.value.findIndex(type => type.id === id)
+      const index = pieceTypes.value.findIndex((type) => type.id === id)
       if (index !== -1) {
         pieceTypes.value[index] = normalized
       }
       showSuccess(`Type de pièce "${data.name}" mis à jour`)
 
-      return {
-        success: true,
-        data: normalized
-      }
+      return { success: true, data: normalized }
     } catch (error) {
-      const message = error?.data?.message || error?.message || 'Erreur inconnue'
+      const err = error as Error & { data?: { message?: string }; message?: string }
+      const message = err?.data?.message || err?.message || 'Erreur inconnue'
       showError(`Erreur lors de la mise à jour du type de pièce: ${message}`)
       return { success: false, error: message }
     } finally {
@@ -108,15 +131,16 @@ export function usePieceTypes () {
     }
   }
 
-  const deletePieceType = async (id) => {
+  const deletePieceType = async (id: string): Promise<PieceTypeResult> => {
     loadingPieceTypes.value = true
     try {
       await deleteModelType(id)
-      pieceTypes.value = pieceTypes.value.filter(type => type.id !== id)
+      pieceTypes.value = pieceTypes.value.filter((type) => type.id !== id)
       showSuccess('Type de pièce supprimé')
       return { success: true }
     } catch (error) {
-      const message = error?.data?.message || error?.message || 'Erreur inconnue'
+      const err = error as Error & { data?: { message?: string }; message?: string }
+      const message = err?.data?.message || err?.message || 'Erreur inconnue'
       showError(`Erreur lors de la suppression du type de pièce: ${message}`)
       return { success: false, error: message }
     } finally {
@@ -135,6 +159,6 @@ export function usePieceTypes () {
     updatePieceType,
     deletePieceType,
     getPieceTypes,
-    isPieceTypeLoading
+    isPieceTypeLoading,
   }
 }
diff --git a/app/composables/usePieces.js b/app/composables/usePieces.ts
similarity index 56%
rename from app/composables/usePieces.js
rename to app/composables/usePieces.ts
index 13ec585..0ccab82 100644
--- a/app/composables/usePieces.js
+++ b/app/composables/usePieces.ts
@@ -2,45 +2,84 @@ import { ref } from 'vue'
 import { useToast } from './useToast'
 import { useApi } from './useApi'
 import { buildConstructeurRequestPayload, uniqueConstructeurIds } from '~/shared/constructeurUtils'
-import { useConstructeurs } from './useConstructeurs'
+import { useConstructeurs, type Constructeur } from './useConstructeurs'
 import { extractRelationId, normalizeRelationIds } from '~/shared/apiRelations'
 
-const pieces = ref([])
+export interface Piece {
+  id: string
+  name: string
+  reference?: string | null
+  typePieceId?: string | null
+  typePiece?: { id: string; name?: string } | null
+  productId?: string | null
+  productIds?: string[]
+  product?: { id: string; name?: string } | null
+  constructeurs?: Constructeur[]
+  constructeurIds?: string[]
+  documents?: unknown[]
+  createdAt?: string | null
+  updatedAt?: string | null
+  [key: string]: unknown
+}
+
+interface PieceListResult {
+  success: boolean
+  data?: { items: Piece[]; total: number; page: number; itemsPerPage: number }
+  error?: string
+}
+
+interface PieceSingleResult {
+  success: boolean
+  data?: Piece
+  error?: string
+}
+
+interface LoadPiecesOptions {
+  search?: string
+  page?: number
+  itemsPerPage?: number
+  orderBy?: string
+  orderDir?: 'asc' | 'desc'
+}
+
+const pieces = ref<Piece[]>([])
 const total = ref(0)
 const loading = ref(false)
 
-const extractCollection = (payload) => {
+const extractCollection = (payload: unknown): Piece[] => {
   if (Array.isArray(payload)) {
-    return payload
+    return payload as Piece[]
   }
-  if (Array.isArray(payload?.member)) {
-    return payload.member
+  const p = payload as Record<string, unknown> | null
+  if (Array.isArray(p?.member)) {
+    return p.member as Piece[]
   }
-  if (Array.isArray(payload?.['hydra:member'])) {
-    return payload['hydra:member']
+  if (Array.isArray(p?.['hydra:member'])) {
+    return p['hydra:member'] as Piece[]
   }
-  if (Array.isArray(payload?.data)) {
-    return payload.data
+  if (Array.isArray(p?.data)) {
+    return p.data as Piece[]
   }
   return []
 }
 
-const extractTotal = (payload, fallbackLength) => {
-  if (typeof payload?.totalItems === 'number') {
-    return payload.totalItems
+const extractTotal = (payload: unknown, fallbackLength: number): number => {
+  const p = payload as Record<string, unknown> | null
+  if (typeof p?.totalItems === 'number') {
+    return p.totalItems
   }
-  if (typeof payload?.['hydra:totalItems'] === 'number') {
-    return payload['hydra:totalItems']
+  if (typeof p?.['hydra:totalItems'] === 'number') {
+    return p['hydra:totalItems']
   }
   return fallbackLength
 }
 
-export function usePieces () {
-  const { showSuccess, showError, showInfo } = useToast()
+export function usePieces() {
+  const { showSuccess } = useToast()
   const { get, post, patch, delete: del } = useApi()
   const { ensureConstructeurs } = useConstructeurs()
 
-  const withResolvedConstructeurs = async (piece) => {
+  const withResolvedConstructeurs = async (piece: Piece): Promise<Piece> => {
     if (!piece || typeof piece !== 'object') {
       return piece
     }
@@ -68,12 +107,11 @@ export function usePieces () {
     const ids = uniqueConstructeurIds(
       piece.constructeurIds,
       piece.constructeurs,
-      piece.constructeur,
     )
     const hasResolvedConstructeurs =
-      Array.isArray(piece.constructeurs)
-      && piece.constructeurs.length > 0
-      && piece.constructeurs.every((item) => item && typeof item === 'object')
+      Array.isArray(piece.constructeurs) &&
+      piece.constructeurs.length > 0 &&
+      piece.constructeurs.every((item) => item && typeof item === 'object')
 
     if (ids.length && !hasResolvedConstructeurs) {
       const resolved = await ensureConstructeurs(ids)
@@ -85,16 +123,7 @@ export function usePieces () {
     return piece
   }
 
-  /**
-   * Load pieces with pagination and search support
-   * @param {Object} options - Query options
-   * @param {string} [options.search] - Search term for name/reference
-   * @param {number} [options.page=1] - Current page (1-based)
-   * @param {number} [options.itemsPerPage=30] - Items per page
-   * @param {string} [options.orderBy='name'] - Field to order by
-   * @param {string} [options.orderDir='asc'] - Order direction (asc/desc)
-   */
-  const loadPieces = async (options = {}) => {
+  const loadPieces = async (options: LoadPiecesOptions = {}): Promise<PieceListResult> => {
     loading.value = true
     try {
       const {
@@ -102,7 +131,7 @@ export function usePieces () {
         page = 1,
         itemsPerPage = 30,
         orderBy = 'name',
-        orderDir = 'asc'
+        orderDir = 'asc',
       } = options
 
       const params = new URLSearchParams()
@@ -110,11 +139,9 @@ export function usePieces () {
       params.set('page', String(page))
 
       if (search && search.trim()) {
-        // API Platform uses property filters
         params.set('name', search.trim())
       }
 
-      // API Platform OrderFilter syntax: order[field]=direction
       params.set(`order[${orderBy}]`, orderDir)
 
       const result = await get(`/pieces?${params.toString()}`)
@@ -129,79 +156,84 @@ export function usePieces () {
             items: enrichedItems,
             total: total.value,
             page,
-            itemsPerPage
-          }
+            itemsPerPage,
+          },
         }
       }
-      return result
+      return result as PieceListResult
     } catch (error) {
       console.error('Erreur lors du chargement des pièces:', error)
-      return { success: false, error: error.message }
+      return { success: false, error: (error as Error).message }
     } finally {
       loading.value = false
     }
   }
 
-  const createPiece = async (pieceData) => {
+  const createPiece = async (pieceData: Partial<Piece>): Promise<PieceSingleResult> => {
     loading.value = true
     try {
       const normalizedPayload = normalizeRelationIds(buildConstructeurRequestPayload(pieceData))
       const result = await post('/pieces', normalizedPayload)
-      if (result.success) {
-        const enriched = await withResolvedConstructeurs(result.data)
+      if (result.success && result.data) {
+        const enriched = await withResolvedConstructeurs(result.data as Piece)
         pieces.value.unshift(enriched)
         total.value += 1
-        const displayName = result.data?.name
-          || pieceData?.definition?.name
-          || pieceData?.name
-          || 'Pièce'
+        const definition = (pieceData as Record<string, unknown>)?.definition as Record<string, unknown> | undefined
+        const displayName =
+          (result.data as Piece)?.name ||
+          (definition?.name as string | undefined) ||
+          pieceData?.name ||
+          'Pièce'
         showSuccess(`Pièce "${displayName}" créée avec succès`)
+        return { success: true, data: enriched }
       }
-      return result
+      return { success: false, error: result.error }
     } catch (error) {
       console.error('Erreur lors de la création de la pièce:', error)
-      return { success: false, error: error.message }
+      return { success: false, error: (error as Error).message }
     } finally {
       loading.value = false
     }
   }
 
-  const updatePieceData = async (id, pieceData) => {
+  const updatePieceData = async (id: string, pieceData: Partial<Piece>): Promise<PieceSingleResult> => {
     loading.value = true
     try {
       const normalizedPayload = normalizeRelationIds(buildConstructeurRequestPayload(pieceData))
       const result = await patch(`/pieces/${id}`, normalizedPayload)
-      if (result.success) {
-        const updated = await withResolvedConstructeurs(result.data)
-        const index = pieces.value.findIndex(piece => piece.id === id)
+      if (result.success && result.data) {
+        const updated = await withResolvedConstructeurs(result.data as Piece)
+        const index = pieces.value.findIndex((piece) => piece.id === id)
         if (index !== -1) {
           pieces.value[index] = updated
         }
         showSuccess(`Pièce "${updated?.name || pieceData.name || ''}" mise à jour avec succès`)
+        return { success: true, data: updated }
       }
-      return result
+      return { success: false, error: result.error }
     } catch (error) {
       console.error('Erreur lors de la mise à jour de la pièce:', error)
-      return { success: false, error: error.message }
+      return { success: false, error: (error as Error).message }
     } finally {
       loading.value = false
     }
   }
 
-  const deletePiece = async (id) => {
+  const deletePiece = async (id: string): Promise<PieceSingleResult> => {
     loading.value = true
     try {
       const result = await del(`/pieces/${id}`)
       if (result.success) {
-        const deletedPiece = pieces.value.find(piece => piece.id === id)
-        pieces.value = pieces.value.filter(piece => piece.id !== id)
+        const deletedPiece = pieces.value.find((piece) => piece.id === id)
+        pieces.value = pieces.value.filter((piece) => piece.id !== id)
         total.value = Math.max(0, total.value - 1)
         showSuccess(`Pièce "${deletedPiece?.name || 'inconnu'}" supprimée avec succès`)
+        return { success: true }
       }
-      return result
+      return { success: false, error: result.error }
     } catch (error) {
       console.error('Erreur lors de la suppression de la pièce:', error)
-      return { success: false, error: error.message }
+      return { success: false, error: (error as Error).message }
     } finally {
       loading.value = false
     }
@@ -219,6 +251,6 @@ export function usePieces () {
     updatePiece: updatePieceData,
     deletePiece,
     getPieces,
-    isLoading
+    isLoading,
   }
 }
diff --git a/app/composables/useProductTypes.js b/app/composables/useProductTypes.ts
similarity index 53%
rename from app/composables/useProductTypes.js
rename to app/composables/useProductTypes.ts
index d2071c0..7489fe7 100644
--- a/app/composables/useProductTypes.js
+++ b/app/composables/useProductTypes.ts
@@ -1,14 +1,34 @@
 import { ref } from 'vue'
 import { useToast } from './useToast'
-import { listModelTypes, createModelType, updateModelType, deleteModelType } from '~/services/modelTypes'
+import { listModelTypes, createModelType, updateModelType, deleteModelType, type ModelType } from '~/services/modelTypes'
+import type { ProductModelStructure } from '~/shared/types/inventory'
 
-const productTypes = ref([])
+export interface ProductType extends ModelType {
+  structure: ProductModelStructure | null
+  description?: string | null
+}
+
+interface ProductTypePayload {
+  name: string
+  code?: string
+  description?: string | null
+  notes?: string | null
+  structure?: ProductModelStructure | null
+}
+
+interface ProductTypeResult {
+  success: boolean
+  data?: ProductType | ProductType[]
+  error?: string
+}
+
+const productTypes = ref<ProductType[]>([])
 const loadingProductTypes = ref(false)
 
-export function useProductTypes () {
+export function useProductTypes() {
   const { showSuccess, showError } = useToast()
 
-  const generateCodeFromName = (name) => {
+  const generateCodeFromName = (name: string): string => {
     return (name || '')
       .normalize('NFD')
       .replace(/[\u0300-\u036F]/g, '')
@@ -18,7 +38,7 @@ export function useProductTypes () {
       .replace(/-+/g, '-') || 'type'
   }
 
-  const loadProductTypes = async () => {
+  const loadProductTypes = async (): Promise<ProductTypeResult> => {
     loadingProductTypes.value = true
     try {
       const data = await listModelTypes({
@@ -28,14 +48,16 @@ export function useProductTypes () {
         limit: 200,
       })
 
-      productTypes.value = data.items.map(item => ({
+      productTypes.value = data.items.map((item) => ({
         ...item,
+        structure: item.structure as ProductModelStructure | null,
         description: item.description ?? item.notes ?? null,
       }))
 
       return { success: true, data: productTypes.value }
     } catch (error) {
-      const message = error?.message || 'Erreur inconnue'
+      const err = error as Error & { message?: string }
+      const message = err?.message || 'Erreur inconnue'
       showError(`Impossible de charger les types de produit: ${message}`)
       return { success: false, error: message }
     } finally {
@@ -43,20 +65,21 @@ export function useProductTypes () {
     }
   }
 
-  const createProductType = async (payload) => {
+  const createProductType = async (payload: ProductTypePayload): Promise<ProductTypeResult> => {
     loadingProductTypes.value = true
     try {
       const data = await createModelType({
         name: payload.name,
         code: payload.code || generateCodeFromName(payload.name),
         category: 'PRODUCT',
-        notes: payload.description ?? payload.notes,
-        description: payload.description ?? null,
-        structure: payload.structure,
+        notes: payload.description ?? payload.notes ?? undefined,
+        description: payload.description ?? undefined,
+        structure: payload.structure ?? undefined,
       })
 
-      const normalized = {
+      const normalized: ProductType = {
         ...data,
+        structure: data.structure as ProductModelStructure | null,
         description: data.description ?? data.notes ?? null,
       }
 
@@ -65,7 +88,8 @@ export function useProductTypes () {
 
       return { success: true, data: normalized }
     } catch (error) {
-      const message = error?.data?.message || error?.message || 'Erreur inconnue'
+      const err = error as Error & { data?: { message?: string }; message?: string }
+      const message = err?.data?.message || err?.message || 'Erreur inconnue'
       showError(`Erreur lors de la création du type de produit: ${message}`)
       return { success: false, error: message }
     } finally {
@@ -73,23 +97,24 @@ export function useProductTypes () {
     }
   }
 
-  const updateProductType = async (id, payload) => {
+  const updateProductType = async (id: string, payload: ProductTypePayload): Promise<ProductTypeResult> => {
     loadingProductTypes.value = true
     try {
       const data = await updateModelType(id, {
         name: payload.name,
-        description: payload.description,
-        notes: payload.notes,
+        description: payload.description ?? undefined,
+        notes: payload.notes ?? undefined,
         code: payload.code,
-        structure: payload.structure,
+        structure: payload.structure ?? undefined,
       })
 
-      const normalized = {
+      const normalized: ProductType = {
         ...data,
+        structure: data.structure as ProductModelStructure | null,
         description: data.description ?? data.notes ?? null,
       }
 
-      const index = productTypes.value.findIndex(type => type.id === id)
+      const index = productTypes.value.findIndex((type) => type.id === id)
       if (index !== -1) {
         productTypes.value[index] = normalized
       }
@@ -97,7 +122,8 @@ export function useProductTypes () {
 
       return { success: true, data: normalized }
     } catch (error) {
-      const message = error?.data?.message || error?.message || 'Erreur inconnue'
+      const err = error as Error & { data?: { message?: string }; message?: string }
+      const message = err?.data?.message || err?.message || 'Erreur inconnue'
       showError(`Erreur lors de la mise à jour du type de produit: ${message}`)
       return { success: false, error: message }
     } finally {
@@ -105,15 +131,16 @@ export function useProductTypes () {
     }
   }
 
-  const deleteProductType = async (id) => {
+  const deleteProductType = async (id: string): Promise<ProductTypeResult> => {
     loadingProductTypes.value = true
     try {
       await deleteModelType(id)
-      productTypes.value = productTypes.value.filter(type => type.id !== id)
+      productTypes.value = productTypes.value.filter((type) => type.id !== id)
       showSuccess('Type de produit supprimé')
       return { success: true }
     } catch (error) {
-      const message = error?.data?.message || error?.message || 'Erreur inconnue'
+      const err = error as Error & { data?: { message?: string }; message?: string }
+      const message = err?.data?.message || err?.message || 'Erreur inconnue'
       showError(`Erreur lors de la suppression du type de produit: ${message}`)
       return { success: false, error: message }
     } finally {
diff --git a/app/composables/useProducts.js b/app/composables/useProducts.ts
similarity index 66%
rename from app/composables/useProducts.js
rename to app/composables/useProducts.ts
index 5ed4165..065e501 100644
--- a/app/composables/useProducts.js
+++ b/app/composables/useProducts.ts
@@ -2,16 +2,52 @@ import { ref } from 'vue'
 import { useToast } from './useToast'
 import { useApi } from './useApi'
 import { buildConstructeurRequestPayload, uniqueConstructeurIds } from '~/shared/constructeurUtils'
-import { useConstructeurs } from './useConstructeurs'
+import { useConstructeurs, type Constructeur } from './useConstructeurs'
 import { extractRelationId, normalizeRelationIds } from '~/shared/apiRelations'
 
-const products = ref([])
+export interface Product {
+  id: string
+  name: string
+  reference?: string | null
+  typeProductId?: string | null
+  typeProduct?: { id: string; name?: string } | null
+  constructeurs?: Constructeur[]
+  constructeurIds?: string[]
+  supplierPrice?: number | null
+  createdAt?: string | null
+  updatedAt?: string | null
+  documents?: unknown[]
+  [key: string]: unknown
+}
+
+interface ProductListResult {
+  success: boolean
+  data?: { items: Product[]; total: number; page: number; itemsPerPage: number }
+  error?: string
+}
+
+interface ProductSingleResult {
+  success: boolean
+  data?: Product
+  error?: string
+}
+
+interface LoadProductsOptions {
+  search?: string
+  page?: number
+  itemsPerPage?: number
+  orderBy?: string
+  orderDir?: 'asc' | 'desc'
+  force?: boolean
+}
+
+const products = ref<Product[]>([])
 const total = ref(0)
 const loading = ref(false)
 const loaded = ref(false)
-const error = ref(null)
+const error = ref<string | null>(null)
 
-const replaceInCache = (item) => {
+const replaceInCache = (item: Product): boolean => {
   if (!item?.id) {
     return false
   }
@@ -26,38 +62,40 @@ const replaceInCache = (item) => {
   return false
 }
 
-const extractCollection = (payload) => {
+const extractCollection = (payload: unknown): Product[] => {
   if (Array.isArray(payload)) {
-    return payload
+    return payload as Product[]
   }
-  if (Array.isArray(payload?.member)) {
-    return payload.member
+  const p = payload as Record<string, unknown> | null
+  if (Array.isArray(p?.member)) {
+    return p.member as Product[]
   }
-  if (Array.isArray(payload?.['hydra:member'])) {
-    return payload['hydra:member']
+  if (Array.isArray(p?.['hydra:member'])) {
+    return p['hydra:member'] as Product[]
   }
-  if (Array.isArray(payload?.data)) {
-    return payload.data
+  if (Array.isArray(p?.data)) {
+    return p.data as Product[]
   }
   return []
 }
 
-const extractTotal = (payload, fallbackLength) => {
-  if (typeof payload?.totalItems === 'number') {
-    return payload.totalItems
+const extractTotal = (payload: unknown, fallbackLength: number): number => {
+  const p = payload as Record<string, unknown> | null
+  if (typeof p?.totalItems === 'number') {
+    return p.totalItems
   }
-  if (typeof payload?.['hydra:totalItems'] === 'number') {
-    return payload['hydra:totalItems']
+  if (typeof p?.['hydra:totalItems'] === 'number') {
+    return p['hydra:totalItems']
   }
   return fallbackLength
 }
 
-export function useProducts () {
+export function useProducts() {
   const { showError } = useToast()
   const { get, post, patch, delete: del } = useApi()
   const { ensureConstructeurs } = useConstructeurs()
 
-  const withResolvedConstructeurs = async (product) => {
+  const withResolvedConstructeurs = async (product: Product): Promise<Product> => {
     if (!product || typeof product !== 'object') {
       return product
     }
@@ -70,12 +108,11 @@ export function useProducts () {
     const ids = uniqueConstructeurIds(
       product.constructeurIds,
       product.constructeurs,
-      product.constructeur,
     )
     const hasResolvedConstructeurs =
-      Array.isArray(product.constructeurs)
-      && product.constructeurs.length > 0
-      && product.constructeurs.every((item) => item && typeof item === 'object')
+      Array.isArray(product.constructeurs) &&
+      product.constructeurs.length > 0 &&
+      product.constructeurs.every((item) => item && typeof item === 'object')
 
     if (ids.length && !hasResolvedConstructeurs) {
       const resolved = await ensureConstructeurs(ids)
@@ -87,24 +124,13 @@ export function useProducts () {
     return product
   }
 
-  /**
-   * Load products with pagination and search support
-   * @param {Object} options - Query options
-   * @param {string} [options.search] - Search term for name/reference
-   * @param {number} [options.page=1] - Current page (1-based)
-   * @param {number} [options.itemsPerPage=30] - Items per page
-   * @param {string} [options.orderBy='name'] - Field to order by
-   * @param {string} [options.orderDir='asc'] - Order direction (asc/desc)
-   * @param {boolean} [options.force=false] - Force reload even if already loaded
-   */
-  const loadProducts = async (options = {}) => {
+  const loadProducts = async (options: LoadProductsOptions = {}): Promise<ProductListResult> => {
     const {
       search = '',
       page = 1,
       itemsPerPage = 30,
       orderBy = 'name',
       orderDir = 'asc',
-      force = false
     } = options
 
     if (loading.value) {
@@ -140,17 +166,17 @@ export function useProducts () {
             items: enrichedItems,
             total: total.value,
             page,
-            itemsPerPage
-          }
+            itemsPerPage,
+          },
         }
       } else if (result.error) {
         error.value = result.error
         showError(`Impossible de charger les produits: ${result.error}`)
       }
-      return result
+      return result as ProductListResult
     } catch (err) {
       console.error('Erreur lors du chargement des produits:', err)
-      const message = err?.message ?? 'Erreur inconnue'
+      const message = (err as Error)?.message ?? 'Erreur inconnue'
       error.value = message
       showError(`Impossible de charger les produits: ${message}`)
       return { success: false, error: message }
@@ -159,26 +185,27 @@ export function useProducts () {
     }
   }
 
-  const createProduct = async (payload) => {
+  const createProduct = async (payload: Partial<Product>): Promise<ProductSingleResult> => {
     const normalizedPayload = normalizeRelationIds(buildConstructeurRequestPayload(payload))
     loading.value = true
     error.value = null
     try {
       const result = await post('/products', normalizedPayload)
       if (result.success && result.data) {
-        const enriched = await withResolvedConstructeurs(result.data)
+        const enriched = await withResolvedConstructeurs(result.data as Product)
         const added = replaceInCache(enriched)
         if (added) {
           total.value += 1
         }
+        return { success: true, data: enriched }
       } else if (result.error) {
         error.value = result.error
         showError(result.error)
       }
-      return result
+      return { success: false, error: result.error }
     } catch (err) {
       console.error('Erreur lors de la création du produit:', err)
-      const message = err?.message ?? 'Erreur inconnue'
+      const message = (err as Error)?.message ?? 'Erreur inconnue'
       error.value = message
       showError(message)
       return { success: false, error: message }
@@ -187,23 +214,24 @@ export function useProducts () {
     }
   }
 
-  const updateProduct = async (id, payload) => {
+  const updateProduct = async (id: string, payload: Partial<Product>): Promise<ProductSingleResult> => {
     const normalizedPayload = normalizeRelationIds(buildConstructeurRequestPayload(payload))
     loading.value = true
     error.value = null
     try {
       const result = await patch(`/products/${id}`, normalizedPayload)
       if (result.success && result.data) {
-        const enriched = await withResolvedConstructeurs(result.data)
+        const enriched = await withResolvedConstructeurs(result.data as Product)
         replaceInCache(enriched)
+        return { success: true, data: enriched }
       } else if (result.error) {
         error.value = result.error
         showError(result.error)
       }
-      return result
+      return { success: false, error: result.error }
     } catch (err) {
       console.error('Erreur lors de la mise à jour du produit:', err)
-      const message = err?.message ?? 'Erreur inconnue'
+      const message = (err as Error)?.message ?? 'Erreur inconnue'
       error.value = message
       showError(message)
       return { success: false, error: message }
@@ -212,23 +240,23 @@ export function useProducts () {
     }
   }
 
-  const deleteProduct = async (id) => {
+  const deleteProduct = async (id: string): Promise<ProductSingleResult> => {
     loading.value = true
     error.value = null
     try {
       const result = await del(`/products/${id}`)
       if (result.success) {
-        const removed = products.value.find((product) => product.id === id)
         products.value = products.value.filter((product) => product.id !== id)
         total.value = Math.max(0, total.value - 1)
+        return { success: true }
       } else if (result.error) {
         error.value = result.error
         showError(result.error)
       }
-      return result
+      return { success: false, error: result.error }
     } catch (err) {
       console.error('Erreur lors de la suppression du produit:', err)
-      const message = err?.message ?? 'Erreur inconnue'
+      const message = (err as Error)?.message ?? 'Erreur inconnue'
       error.value = message
       showError(message)
       return { success: false, error: message }
@@ -237,7 +265,7 @@ export function useProducts () {
     }
   }
 
-  const getProduct = async (id, options = {}) => {
+  const getProduct = async (id: string, options: { force?: boolean } = {}): Promise<ProductSingleResult> => {
     const shouldForce = !!options.force
     if (!shouldForce) {
       const cached = products.value.find((product) => product.id === id)
@@ -249,14 +277,14 @@ export function useProducts () {
     try {
       const result = await get(`/products/${id}`)
       if (result.success && result.data) {
-        const enriched = await withResolvedConstructeurs(result.data)
+        const enriched = await withResolvedConstructeurs(result.data as Product)
         replaceInCache(enriched)
         return { success: true, data: enriched }
       }
-      return result
+      return { success: false, error: result.error }
     } catch (err) {
       console.error('Erreur lors du chargement du produit:', err)
-      const message = err?.message ?? 'Erreur inconnue'
+      const message = (err as Error)?.message ?? 'Erreur inconnue'
       return { success: false, error: message }
     }
   }
diff --git a/app/composables/useSiteManagement.ts b/app/composables/useSiteManagement.ts
index ca564ba..8cf0d53 100644
--- a/app/composables/useSiteManagement.ts
+++ b/app/composables/useSiteManagement.ts
@@ -166,8 +166,9 @@ export function useSiteManagement() {
       )
       uploadingDocuments.value = false
 
-      if (uploadResult.success) {
-        uploadedDocuments = uploadResult.data || []
+      if (uploadResult.success && uploadResult.data) {
+        const data = uploadResult.data
+        uploadedDocuments = (Array.isArray(data) ? data : [data]) as SiteDocument[]
         selectedFiles.value = []
       }
     }
diff --git a/app/composables/useSites.js b/app/composables/useSites.js
deleted file mode 100644
index 1c76e51..0000000
--- a/app/composables/useSites.js
+++ /dev/null
@@ -1,111 +0,0 @@
-import { ref } from 'vue'
-import { useToast } from './useToast'
-import { useApi } from './useApi'
-
-const sites = ref([])
-const loading = ref(false)
-
-export function useSites () {
-  const { showSuccess, showInfo } = useToast()
-  const { get, post, patch, delete: del } = useApi()
-
-  const loadSites = async () => {
-    loading.value = true
-    try {
-      const result = await get('/sites')
-      console.log('sites api result', result)
-
-      if (result.success) {
-        const collection = Array.isArray(result.data)
-          ? result.data
-          : Array.isArray(result.data?.member)
-            ? result.data.member
-            : Array.isArray(result.data?.['hydra:member'])
-              ? result.data['hydra:member']
-              : Array.isArray(result.data?.data)
-                ? result.data.data
-                : []
-        sites.value = collection
-        showInfo(`Chargement de ${collection.length} site(s) réussi`)
-      }
-    } catch (error) {
-      console.error('Erreur lors du chargement des sites:', error)
-    } finally {
-      loading.value = false
-    }
-  }
-
-  const createSite = async (siteData) => {
-    loading.value = true
-    try {
-      const result = await post('/sites', siteData)
-      if (result.success) {
-        sites.value.push(result.data)
-        showSuccess(`Site "${siteData.name}" créé avec succès`)
-      }
-      return result
-    } catch (error) {
-      console.error('Erreur lors de la création du site:', error)
-      return { success: false, error: error.message }
-    } finally {
-      loading.value = false
-    }
-  }
-
-  const updateSite = async (id, siteData) => {
-    loading.value = true
-    try {
-      const result = await patch(`/sites/${id}`, siteData)
-      if (result.success) {
-        const index = sites.value.findIndex(site => site.id === id)
-        if (index !== -1) {
-          sites.value[index] = result.data
-        }
-        showSuccess(`Site "${siteData.name}" mis à jour avec succès`)
-      }
-      return result
-    } catch (error) {
-      console.error('Erreur lors de la mise à jour du site:', error)
-      return { success: false, error: error.message }
-    } finally {
-      loading.value = false
-    }
-  }
-
-  const deleteSite = async (id) => {
-    loading.value = true
-    try {
-      const result = await del(`/sites/${id}`)
-      if (result.success) {
-        const deletedSite = sites.value.find(site => site.id === id)
-        sites.value = sites.value.filter(site => site.id !== id)
-        showSuccess(`Site "${deletedSite?.name || 'inconnu'}" supprimé avec succès`)
-      }
-      return result
-    } catch (error) {
-      console.error('Erreur lors de la suppression du site:', error)
-      return { success: false, error: error.message }
-    } finally {
-      loading.value = false
-    }
-  }
-
-  const getSiteById = (id) => {
-    return sites.value.find(site => site.id === id)
-  }
-
-  const getSites = () => sites.value
-  const isLoading = () => loading.value
-
-  return {
-    sites,
-    loading,
-    loadSites,
-    createSite,
-    updateSite,
-    deleteSite,
-    getSiteById,
-    getSites,
-    isLoading
-  }
-}
diff --git a/app/composables/useSites.ts b/app/composables/useSites.ts
new file mode 100644
index 0000000..022ba56
--- /dev/null
+++ b/app/composables/useSites.ts
@@ -0,0 +1,139 @@
+import { ref } from 'vue'
+import { useToast } from './useToast'
+import { useApi } from './useApi'
+
+export interface Site {
+  id: string
+  name?: string
+  contactName?: string
+  contactPhone?: string
+  contactAddress?: string
+  contactPostalCode?: string
+  contactCity?: string
+  machines?: unknown[]
+  documents?: unknown[]
+  [key: string]: unknown
+}
+
+interface SiteResult {
+  success: boolean
+  data?: Site
+  error?: string
+}
+
+const sites = ref<Site[]>([])
+const loading = ref(false)
+
+const extractCollection = (payload: unknown): Site[] => {
+  if (Array.isArray(payload)) {
+    return payload as Site[]
+  }
+  const p = payload as Record<string, unknown> | null
+  if (Array.isArray(p?.member)) {
+    return p.member as Site[]
+  }
+  if (Array.isArray(p?.['hydra:member'])) {
+    return p['hydra:member'] as Site[]
+  }
+  if (Array.isArray(p?.data)) {
+    return p.data as Site[]
+  }
+  return []
+}
+
+export function useSites() {
+  const { showSuccess, showInfo } = useToast()
+  const { get, post, patch, delete: del } = useApi()
+
+  const loadSites = async (): Promise<void> => {
+    loading.value = true
+    try {
+      const result = await get('/sites')
+      console.log('sites api result', result)
+
+      if (result.success) {
+        const collection = extractCollection(result.data)
+        sites.value = collection
+        showInfo(`Chargement de ${collection.length} site(s) réussi`)
+      }
+    } catch (error) {
+      console.error('Erreur lors du chargement des sites:', error)
+    } finally {
+      loading.value = false
+    }
+  }
+
+  const createSite = async (siteData: Partial<Site>): Promise<SiteResult> => {
+    loading.value = true
+    try {
+      const result = await post('/sites', siteData)
+      if (result.success && result.data) {
+        sites.value.push(result.data as Site)
+        showSuccess(`Site "${siteData.name}" créé avec succès`)
+      }
+      return result as SiteResult
+    } catch (error) {
+      console.error('Erreur lors de la création du site:', error)
+      return { success: false, error: (error as Error).message }
+    } finally {
+      loading.value = false
+    }
+  }
+
+  const updateSite = async (id: string, siteData: Partial<Site>): Promise<SiteResult> => {
+    loading.value = true
+    try {
+      const result = await patch(`/sites/${id}`, siteData)
+      if (result.success && result.data) {
+        const index = sites.value.findIndex((site) => site.id === id)
+        if (index !== -1) {
+          sites.value[index] = result.data as Site
+        }
+        showSuccess(`Site "${siteData.name}" mis à jour avec succès`)
+      }
+      return result as SiteResult
+    } catch (error) {
+      console.error('Erreur lors de la mise à jour du site:', error)
+      return { success: false, error: (error as Error).message }
+    } finally {
+      loading.value = false
+    }
+  }
+
+  const deleteSite = async (id: string): Promise<SiteResult> => {
+    loading.value = true
+    try {
+      const result = await del(`/sites/${id}`)
+      if (result.success) {
+        const deletedSite = sites.value.find((site) => site.id === id)
+        sites.value = sites.value.filter((site) => site.id !== id)
+        showSuccess(`Site "${deletedSite?.name || 'inconnu'}" supprimé avec succès`)
+      }
+      return result as SiteResult
+    } catch (error) {
+      console.error('Erreur lors de la suppression du site:', error)
+      return { success: false, error: (error as Error).message }
+    } finally {
+      loading.value = false
+    }
+  }
+
+  const getSiteById = (id: string): Site | undefined => {
+    return sites.value.find((site) => site.id === id)
+  }
+
+  const getSites = () => sites.value
+  const isLoading = () => loading.value
+
+  return {
+    sites,
+    loading,
+    loadSites,
+    createSite,
+    updateSite,
+    deleteSite,
+    getSiteById,
+    getSites,
+    isLoading,
+  }
+}
diff --git a/app/pages/component/[id]/edit.vue b/app/pages/component/[id]/edit.vue
index 4e7701f..f81095d 100644
--- a/app/pages/component/[id]/edit.vue
+++ b/app/pages/component/[id]/edit.vue
@@ -539,26 +539,34 @@ import { formatStructurePreview, normalizeStructureForEditor } from '~/shared/mo
 import { uniqueConstructeurIds } from '~/shared/constructeurUtils'
 import type { ComponentModelStructure } from '~/shared/types/inventory'
 import type { ModelType } from '~/services/modelTypes'
-import { getFileIcon } from '~/utils/fileIcons'
-import { canPreviewDocument, isImageDocument, isPdfDocument } from '~/utils/documentPreview'
+import { canPreviewDocument } from '~/utils/documentPreview'
+import {
+  type CustomFieldInput,
+  fieldKey,
+  buildCustomFieldInputs,
+  requiredCustomFieldsFilled as _requiredCustomFieldsFilled,
+  saveCustomFieldValues as _saveCustomFieldValues,
+} from '~/shared/utils/customFieldFormUtils'
+import {
+  documentIcon,
+  formatSize,
+  shouldInlinePdf,
+  documentPreviewSrc,
+  documentThumbnailClass,
+  downloadDocument,
+} from '~/shared/utils/documentDisplayUtils'
+import {
+  historyActionLabel,
+  formatHistoryDate,
+  formatHistoryValue,
+  historyDiffEntries as _historyDiffEntries,
+} from '~/shared/utils/historyDisplayUtils'
 
 interface ComponentCatalogType extends ModelType {
   structure: ComponentModelStructure | null
   customFields?: Array<Record<string, any>>
 }
 
-interface CustomFieldInput {
-  id: string | null
-  name: string
-  type: string
-  required: boolean
-  options: string[]
-  value: string
-  customFieldId: string | null
-  customFieldValueId: string | null
-  orderIndex: number
-}
-
 const route = useRoute()
 const router = useRouter()
 const { get } = useApi()
@@ -601,75 +609,8 @@ const historyFieldLabels: Record<string, string> = {
   constructeurIds: 'Fournisseurs',
 }
 
-const historyActionLabel = (action: string) => {
-  if (action === 'create') {
-    return 'Création'
-  }
-  if (action === 'delete') {
-    return 'Suppression'
-  }
-  return 'Modification'
-}
-
-const historyDateFormatter = new Intl.DateTimeFormat('fr-FR', {
-  dateStyle: 'medium',
-  timeStyle: 'short',
-})
-
-const formatHistoryDate = (value: string) => {
-  const date = new Date(value)
-  if (Number.isNaN(date.getTime())) {
-    return value
-  }
-  return historyDateFormatter.format(date)
-}
-
-const formatHistoryValue = (value: unknown): string => {
-  if (value === null || value === undefined || value === '') {
-    return '—'
-  }
-  if (Array.isArray(value)) {
-    if (value.length === 0) {
-      return '—'
-    }
-    return value.map((item) => formatHistoryValue(item)).join(', ')
-  }
-  if (typeof value === 'object') {
-    const maybeRecord = value as Record<string, unknown>
-    const name = typeof maybeRecord.name === 'string' ? maybeRecord.name : null
-    const id = typeof maybeRecord.id === 'string' ? maybeRecord.id : null
-    if (name && id) {
-      return `${name} (#${id})`
-    }
-    if (name) {
-      return name
-    }
-    if (id) {
-      return `#${id}`
-    }
-    try {
-      return JSON.stringify(value)
-    } catch (error) {
-      return String(value)
-    }
-  }
-  return String(value)
-}
-
-const historyDiffEntries = (entry: ComponentHistoryEntry) => {
-  const diff = entry.diff ?? {}
-  return Object.entries(diff).map(([field, change]) => {
-    const label = historyFieldLabels[field] ?? field
-    const fromLabel = formatHistoryValue(change?.from)
-    const toLabel = formatHistoryValue(change?.to)
-    return {
-      field,
-      label,
-      fromLabel,
-      toLabel,
-    }
-  })
-}
+const historyDiffEntries = (entry: ComponentHistoryEntry) =>
+  _historyDiffEntries(entry, historyFieldLabels)
 const selectedTypeId = ref<string>('')
 const editionForm = reactive({
   name: '' as string,
@@ -679,49 +620,6 @@ const editionForm = reactive({
 })
 
 const customFieldInputs = ref<CustomFieldInput[]>([])
-const documentIcon = (doc: any) =>
-  getFileIcon({ name: doc?.filename || doc?.name, mime: doc?.mimeType })
-const formatSize = (size: number | null | undefined) => {
-  if (size === null || size === undefined) {
-    return '—'
-  }
-  if (size === 0) {
-    return '0 B'
-  }
-  const units = ['B', 'KB', 'MB', 'GB']
-  const index = Math.min(units.length - 1, Math.floor(Math.log(size) / Math.log(1024)))
-  const formatted = size / Math.pow(1024, index)
-  return `${formatted.toFixed(1)} ${units[index]}`
-}
-const PDF_PREVIEW_MAX_BYTES = 5 * 1024 * 1024
-const shouldInlinePdf = (document: any) => {
-  if (!document || !isPdfDocument(document) || !document.path) {
-    return false
-  }
-  if (typeof document.size === 'number' && document.size > PDF_PREVIEW_MAX_BYTES) {
-    return false
-  }
-  return true
-}
-const appendPdfViewerParams = (src: string) => {
-  if (!src || src.startsWith('data:')) {
-    return src || ''
-  }
-  if (src.includes('#')) {
-    return `${src}&toolbar=0&navpanes=0`
-  }
-  return `${src}#toolbar=0&navpanes=0`
-}
-const documentPreviewSrc = (document: any) => {
-  if (!document?.path) {
-    return ''
-  }
-  if (isPdfDocument(document)) {
-    return appendPdfViewerParams(document.path)
-  }
-  return document.path
-}
-
 const fetchedPieceTypeMap = ref<Record<string, string>>({})
 const pieceTypeLabelMap = computed(() => ({
   ...Object.fromEntries(
@@ -761,12 +659,6 @@ const componentCatalogMap = computed(() =>
       .map((item: any) => [String(item.id), item]),
   ),
 )
-const documentThumbnailClass = (document: any) => {
-  if (shouldInlinePdf(document) || (isImageDocument(document) && document?.path)) {
-    return 'h-24 w-20'
-  }
-  return 'h-16 w-16'
-}
 const openPreview = (doc: any) => {
   if (!doc || !canPreviewDocument(doc)) {
     return
@@ -778,20 +670,6 @@ const closePreview = () => {
   previewVisible.value = false
   previewDocument.value = null
 }
-const downloadDocument = (doc: any) => {
-  if (!doc?.path) {
-    return
-  }
-  const target = String(doc.path)
-  if (target.startsWith('data:')) {
-    const link = document.createElement('a')
-    link.href = target
-    link.download = doc.filename || doc.name || 'document'
-    link.click()
-    return
-  }
-  window.open(target, '_blank')
-}
 const removeDocument = async (documentId: string | number | null | undefined) => {
   if (!documentId) {
     return
@@ -865,15 +743,7 @@ const refreshCustomFieldInputs = (
 }
 
 const requiredCustomFieldsFilled = computed(() =>
-  customFieldInputs.value.every((field) => {
-    if (!field.required) {
-      return true
-    }
-    if (field.type === 'boolean') {
-      return field.value === 'true' || field.value === 'false'
-    }
-    return toFieldString(field.value).trim() !== ''
-  }),
+  _requiredCustomFieldsFilled(customFieldInputs.value),
 )
 
 const canSubmit = computed(() => Boolean(
@@ -883,19 +753,6 @@ const canSubmit = computed(() => Boolean(
   !saving.value,
 ))
 
-const toFieldString = (value: unknown): string => {
-  if (value === null || value === undefined) {
-    return ''
-  }
-  if (typeof value === 'string') {
-    return value
-  }
-  if (typeof value === 'number' || typeof value === 'boolean') {
-    return String(value)
-  }
-  return ''
-}
-
 const fetchComponent = async () => {
   const id = route.params.id
   if (!id || typeof id !== 'string') {
@@ -996,7 +853,15 @@ const submitEdition = async () => {
     const result = await updateComposant(component.value.id, payload)
     if (result.success) {
       const updatedComponent = result.data
-      await saveCustomFieldValues(updatedComponent)
+      await _saveCustomFieldValues(
+        'composant',
+        updatedComponent.id,
+        [
+          updatedComponent?.typeComposant?.customFields,
+          updatedComponent?.typeMachineComponentRequirement?.typeComposant?.customFields,
+        ],
+        { customFieldInputs, upsertCustomFieldValue, updateCustomFieldValue, toast },
+      )
       await router.push('/component-catalog')
     }
   } catch (error: any) {
@@ -1006,260 +871,6 @@ const submitEdition = async () => {
   }
 }
 
-const buildCustomFieldInputs = (
-  structure: ComponentModelStructure | null,
-  values: any[] | null,
-): CustomFieldInput[] => {
-  const normalizedStructure = structure ? normalizeStructureForEditor(structure) : null
-  const definitions = normalizeCustomFieldInputs(normalizedStructure)
-  const valueList = Array.isArray(values) ? values : []
-
-  const mapById = new Map<string, any>()
-  const mapByName = new Map<string, any>()
-
-  valueList.forEach((entry) => {
-    if (!entry || typeof entry !== 'object') {
-      return
-    }
-    const fieldId = entry.customField?.id || entry.customFieldId || null
-    if (fieldId) {
-      mapById.set(fieldId, entry)
-    }
-    const fieldName = entry.customField?.name || entry.name || entry.key || null
-    if (fieldName) {
-      mapByName.set(fieldName, entry)
-    }
-  })
-
-  const resolved: CustomFieldInput[] = definitions.map((definition) => {
-    const definitionId = definition.customFieldId || definition.id || null
-    const matched = (definitionId ? mapById.get(definitionId) : null) || mapByName.get(definition.name)
-
-    if (!matched) {
-      return {
-        ...definition,
-        customFieldId: definition.customFieldId || definition.id,
-        customFieldValueId: null,
-        orderIndex: definition.orderIndex,
-      }
-    }
-
-    const resolvedValue = extractStoredCustomFieldValue(matched)
-    return {
-      ...definition,
-      customFieldId: matched.customField?.id || definition.customFieldId || definition.id,
-      customFieldValueId: matched.id ?? null,
-      value: formatDefaultValue(definition.type, resolvedValue),
-      orderIndex: Math.min(
-        definition.orderIndex ?? 0,
-        typeof matched.customField?.orderIndex === 'number'
-          ? matched.customField.orderIndex
-          : definition.orderIndex ?? 0,
-      ),
-    }
-  }).sort((a, b) => (a.orderIndex ?? 0) - (b.orderIndex ?? 0))
-
-  return resolved
-}
-
-const fieldKey = (field: CustomFieldInput, index: number) =>
-  field.customFieldValueId || field.id || `${field.name}-${index}`
-
-const normalizeCustomFieldInputs = (structure: ComponentModelStructure | null): CustomFieldInput[] => {
-  if (!structure || typeof structure !== 'object') {
-    return []
-  }
-  const fields = Array.isArray(structure.customFields) ? structure.customFields : []
-  return fields
-    .map((field, index) => normalizeCustomField(field, index))
-    .filter((field): field is CustomFieldInput => field !== null)
-    .sort((a, b) => a.orderIndex - b.orderIndex)
-}
-
-const normalizeCustomField = (rawField: any, fallbackIndex = 0): CustomFieldInput | null => {
-  if (!rawField || typeof rawField !== 'object') {
-    return null
-  }
-  const name = resolveFieldName(rawField)
-  if (!name) {
-    return null
-  }
-  const type = resolveFieldType(rawField)
-  const required = resolveRequiredFlag(rawField)
-  const options = resolveOptions(rawField)
-  const defaultSource = resolveDefaultValue(rawField)
-  const value = formatDefaultValue(type, defaultSource)
-  const id = typeof rawField.id === 'string' ? rawField.id : null
-  const customFieldId = typeof rawField.customFieldId === 'string' ? rawField.customFieldId : id
-  const customFieldValueId = typeof rawField.customFieldValueId === 'string'
-    ? rawField.customFieldValueId
-    : null
-  const orderIndex = typeof rawField.orderIndex === 'number' ? rawField.orderIndex : fallbackIndex
-  return { id, name, type, required, options, value, customFieldId, customFieldValueId, orderIndex }
-}
-
-const resolveFieldName = (field: any): string => {
-  if (typeof field?.name === 'string' && field.name.trim()) {
-    return field.name.trim()
-  }
-  if (typeof field?.key === 'string' && field.key.trim()) {
-    return field.key.trim()
-  }
-  if (typeof field?.label === 'string' && field.label.trim()) {
-    return field.label.trim()
-  }
-  return ''
-}
-
-const resolveFieldType = (field: any): string => {
-  const allowed = ['text', 'number', 'select', 'boolean', 'date']
-  const rawType =
-    typeof field?.type === 'string'
-      ? field.type
-      : typeof field?.value?.type === 'string'
-        ? field.value.type
-        : ''
-  const value = rawType.toLowerCase()
-  return allowed.includes(value) ? value : 'text'
-}
-
-const resolveDefaultValue = (field: any): any => {
-  if (!field || typeof field !== 'object') {
-    return null
-  }
-  if (field.defaultValue !== undefined && field.defaultValue !== null) {
-    return field.defaultValue
-  }
-  if (field.value !== undefined && field.value !== null && typeof field.value !== 'object') {
-    return field.value
-  }
-  if (field.default !== undefined && field.default !== null) {
-    return field.default
-  }
-  if (field.value && typeof field.value === 'object') {
-    if ((field.value as any).defaultValue !== undefined && (field.value as any).defaultValue !== null) {
-      return (field.value as any).defaultValue
-    }
-    if ((field.value as any).value !== undefined && (field.value as any).value !== null && typeof (field.value as any).value !== 'object') {
-      return (field.value as any).value
-    }
-  }
-  return null
-}
-
-const formatDefaultValue = (type: string, defaultValue: any): string => {
-  if (defaultValue === null || defaultValue === undefined) {
-    return ''
-  }
-  if (typeof defaultValue === 'object') {
-    if (defaultValue === null) {
-      return ''
-    }
-    if ('defaultValue' in (defaultValue as Record<string, any>)) {
-      return formatDefaultValue(type, (defaultValue as Record<string, any>).defaultValue)
-    }
-    if ('value' in (defaultValue as Record<string, any>)) {
-      return formatDefaultValue(type, (defaultValue as Record<string, any>).value)
-    }
-    return ''
-  }
-  if (type === 'boolean') {
-    const normalized = String(defaultValue).toLowerCase()
-    if (normalized === 'true' || normalized === '1') {
-      return 'true'
-    }
-    if (normalized === 'false' || normalized === '0') {
-      return 'false'
-    }
-    return ''
-  }
-  return String(defaultValue)
-}
-
-const resolveRequiredFlag = (field: any): boolean => {
-  if (typeof field?.required === 'boolean') {
-    return field.required
-  }
-  const nestedRequired = field?.value?.required
-  if (typeof nestedRequired === 'boolean') {
-    return nestedRequired
-  }
-  if (typeof nestedRequired === 'string') {
-    const normalized = nestedRequired.toLowerCase()
-    return normalized === 'true' || normalized === '1'
-  }
-  return false
-}
-
-const resolveOptions = (field: any): string[] => {
-  const sources = [field?.options, field?.value?.options, field?.value?.choices]
-  for (const source of sources) {
-    if (Array.isArray(source)) {
-      const mapped = source
-        .map((option: unknown) => {
-          if (option === null || option === undefined) {
-            return ''
-          }
-          if (typeof option === 'string') {
-            return option.trim()
-          }
-          if (typeof option === 'object') {
-            const record = option || {}
-            const keys = ['value', 'label', 'name']
-            for (const key of keys) {
-              const candidate = record[key]
-              if (typeof candidate === 'string' && candidate.trim().length > 0) {
-                return candidate.trim()
-              }
-            }
-          }
-          const fallback = String(option).trim()
-          return fallback === '[object Object]' ? '' : fallback
-        })
-        .filter((option) => option.length > 0)
-      if (mapped.length) {
-        return mapped
-      }
-    }
-  }
-  return []
-}
-
-const extractStoredCustomFieldValue = (entry: any): any => {
-  if (entry === null || entry === undefined) {
-    return ''
-  }
-  if (typeof entry === 'string' || typeof entry === 'number' || typeof entry === 'boolean') {
-    return entry
-  }
-  if (typeof entry !== 'object') {
-    return String(entry)
-  }
-  const direct = entry.value
-  if (direct !== undefined && direct !== null) {
-    if (typeof direct === 'object') {
-      if (direct === null) {
-        return ''
-      }
-      if ('value' in direct && direct.value !== undefined && direct.value !== null) {
-        return direct.value
-      }
-      if ('defaultValue' in direct && direct.defaultValue !== undefined && direct.defaultValue !== null) {
-        return direct.defaultValue
-      }
-      return ''
-    }
-    return direct
-  }
-  if (entry.defaultValue !== undefined && entry.defaultValue !== null) {
-    return entry.defaultValue
-  }
-  if (entry.customFieldValue?.value !== undefined && entry.customFieldValue?.value !== null) {
-    return entry.customFieldValue.value
-  }
-  return ''
-}
-
 const getStructureCustomFields = (structure: ComponentModelStructure | null) => {
   return Array.isArray(structure?.customFields) ? structure.customFields : []
 }
@@ -1513,104 +1124,6 @@ const structureSelections = computed(() => {
   }
 })
 
-const buildCustomFieldMetadata = (field: CustomFieldInput) => ({
-  customFieldName: field.name,
-  customFieldType: field.type,
-  customFieldRequired: field.required,
-  customFieldOptions: field.options,
-})
-
-const shouldPersistField = (field: CustomFieldInput) => {
-  if (field.type === 'boolean') {
-    return field.value === 'true' || field.value === 'false'
-  }
-  return toFieldString(field.value).trim() !== ''
-}
-
-const formatValueForPersistence = (field: CustomFieldInput) => {
-  if (field.type === 'boolean') {
-    return field.value === 'true' ? 'true' : 'false'
-  }
-  return toFieldString(field.value).trim()
-}
-
-const saveCustomFieldValues = async (updatedComponent: any) => {
-  if (!updatedComponent || !updatedComponent.id) {
-    return
-  }
-
-  const definitionMap = new Map<string, string>()
-  const registerDefinitions = (fields: any[]) => {
-    if (!Array.isArray(fields)) {
-      return
-    }
-    fields.forEach((field) => {
-      if (!field || typeof field !== 'object') {
-        return
-      }
-      const name = typeof field.name === 'string' ? field.name : null
-      const id = typeof field.id === 'string' ? field.id : null
-      if (name && id && !definitionMap.has(name)) {
-        definitionMap.set(name, id)
-      }
-    })
-  }
-
-  registerDefinitions(updatedComponent?.typeComposant?.customFields)
-  registerDefinitions(updatedComponent?.typeMachineComponentRequirement?.typeComposant?.customFields)
-
-  const resolveDefinitionId = (field: CustomFieldInput) => {
-    if (field.customFieldId) {
-      return field.customFieldId
-    }
-    if (field.id) {
-      return field.id
-    }
-    return definitionMap.get(field.name) ?? null
-  }
-
-  for (const field of customFieldInputs.value) {
-    if (!shouldPersistField(field)) {
-      continue
-    }
-
-    const definitionId = resolveDefinitionId(field)
-    const metadata = definitionId ? undefined : buildCustomFieldMetadata(field)
-    const value = formatValueForPersistence(field)
-
-    if (field.customFieldValueId) {
-      const result = await updateCustomFieldValue(field.customFieldValueId, { value })
-      if (!result.success) {
-        toast.showError(`Impossible de mettre à jour le champ personnalisé "${field.name}"`)
-      } else if (definitionId && !field.customFieldId) {
-        field.customFieldId = definitionId
-      }
-      continue
-    }
-
-    const result = await upsertCustomFieldValue(
-      definitionId,
-      'composant',
-      updatedComponent.id,
-      value,
-      metadata,
-    )
-
-    if (!result.success) {
-      toast.showError(`Impossible d'enregistrer le champ personnalisé "${field.name}"`)
-    } else {
-      const createdValue = result.data
-      if (createdValue?.id) {
-        field.customFieldValueId = createdValue.id
-      }
-      const resolvedId = createdValue?.customField?.id || definitionId
-      if (resolvedId) {
-        field.customFieldId = resolvedId
-      }
-    }
-  }
-}
-
 onMounted(async () => {
   await Promise.allSettled([
     loadComponentTypes(),
diff --git a/app/pages/component/create.vue b/app/pages/component/create.vue
index 1e024ef..f176843 100644
--- a/app/pages/component/create.vue
+++ b/app/pages/component/create.vue
@@ -360,6 +360,10 @@ import { useToast } from '~/composables/useToast'
 import { useCustomFields } from '~/composables/useCustomFields'
 import { useDocuments } from '~/composables/useDocuments'
 import { formatStructurePreview, normalizeStructureForEditor } from '~/shared/modelUtils'
+import {
+  toFieldString,
+  requiredCustomFieldsFilled as _requiredCustomFieldsFilled,
+} from '~/shared/utils/customFieldFormUtils'
 import { uniqueConstructeurIds } from '~/shared/constructeurUtils'
 import type {
   ComponentModelPiece,
@@ -747,15 +751,7 @@ const serializeStructureAssignments = (
 }
 
 const requiredCustomFieldsFilled = computed(() =>
-  customFieldInputs.value.every((field) => {
-    if (!field.required) {
-      return true
-    }
-    if (field.type === 'boolean') {
-      return field.value === 'true' || field.value === 'false'
-    }
-    return toFieldString(field.value).trim() !== ''
-  }),
+  _requiredCustomFieldsFilled(customFieldInputs.value),
 )
 
 const canSubmit = computed(() => Boolean(
@@ -766,19 +762,6 @@ const canSubmit = computed(() => Boolean(
   !submitting.value,
 ))
 
-const toFieldString = (value: unknown): string => {
-  if (value === null || value === undefined) {
-    return ''
-  }
-  if (typeof value === 'string') {
-    return value
-  }
-  if (typeof value === 'number' || typeof value === 'boolean') {
-    return String(value)
-  }
-  return ''
-}
-
 const getStructureCustomFields = (structure: ComponentModelStructure | null) => {
   return Array.isArray(structure?.customFields) ? structure.customFields : []
 }
diff --git a/app/pages/pieces/[id]/edit.vue b/app/pages/pieces/[id]/edit.vue
index 61919cd..c535428 100644
--- a/app/pages/pieces/[id]/edit.vue
+++ b/app/pages/pieces/[id]/edit.vue
@@ -479,31 +479,39 @@ import { useDocuments } from '~/composables/useDocuments'
 import { useConstructeurs } from '~/composables/useConstructeurs'
 import { usePieceHistory, type PieceHistoryEntry } from '~/composables/usePieceHistory'
 import { extractRelationId } from '~/shared/apiRelations'
-import { getFileIcon } from '~/utils/fileIcons'
-import { canPreviewDocument, isImageDocument, isPdfDocument } from '~/utils/documentPreview'
+import { canPreviewDocument } from '~/utils/documentPreview'
 import { formatPieceStructurePreview } from '~/shared/modelUtils'
 import { uniqueConstructeurIds } from '~/shared/constructeurUtils'
 import type { PieceModelProduct, PieceModelStructure } from '~/shared/types/inventory'
 import type { ModelType } from '~/services/modelTypes'
 import { getModelType } from '~/services/modelTypes'
+import {
+  type CustomFieldInput,
+  fieldKey,
+  buildCustomFieldInputs,
+  requiredCustomFieldsFilled as _requiredCustomFieldsFilled,
+  saveCustomFieldValues as _saveCustomFieldValues,
+} from '~/shared/utils/customFieldFormUtils'
+import {
+  documentIcon,
+  formatSize,
+  shouldInlinePdf,
+  documentPreviewSrc,
+  documentThumbnailClass,
+  downloadDocument,
+} from '~/shared/utils/documentDisplayUtils'
+import {
+  historyActionLabel,
+  formatHistoryDate,
+  formatHistoryValue,
+  historyDiffEntries as _historyDiffEntries,
+} from '~/shared/utils/historyDisplayUtils'
 
 interface PieceCatalogType extends ModelType {
   structure: PieceModelStructure | null
   customFields?: Array<Record<string, any>>
 }
 
-interface CustomFieldInput {
-  id: string | null
-  name: string
-  type: string
-  required: boolean
-  options: string[]
-  value: string
-  customFieldId: string | null
-  customFieldValueId: string | null
-  orderIndex: number
-}
-
 const route = useRoute()
 const router = useRouter()
 const { get } = useApi()
@@ -542,75 +550,8 @@ const historyFieldLabels: Record<string, string> = {
   constructeurIds: 'Fournisseurs',
 }
 
-const historyActionLabel = (action: string) => {
-  if (action === 'create') {
-    return 'Création'
-  }
-  if (action === 'delete') {
-    return 'Suppression'
-  }
-  return 'Modification'
-}
-
-const historyDateFormatter = new Intl.DateTimeFormat('fr-FR', {
-  dateStyle: 'medium',
-  timeStyle: 'short',
-})
-
-const formatHistoryDate = (value: string) => {
-  const date = new Date(value)
-  if (Number.isNaN(date.getTime())) {
-    return value
-  }
-  return historyDateFormatter.format(date)
-}
-
-const formatHistoryValue = (value: unknown): string => {
-  if (value === null || value === undefined || value === '') {
-    return '—'
-  }
-  if (Array.isArray(value)) {
-    if (value.length === 0) {
-      return '—'
-    }
-    return value.map((item) => formatHistoryValue(item)).join(', ')
-  }
-  if (typeof value === 'object') {
-    const maybeRecord = value as Record<string, unknown>
-    const name = typeof maybeRecord.name === 'string' ? maybeRecord.name : null
-    const id = typeof maybeRecord.id === 'string' ? maybeRecord.id : null
-    if (name && id) {
-      return `${name} (#${id})`
-    }
-    if (name) {
-      return name
-    }
-    if (id) {
-      return `#${id}`
-    }
-    try {
-      return JSON.stringify(value)
-    } catch (error) {
-      return String(value)
-    }
-  }
-  return String(value)
-}
-
-const historyDiffEntries = (entry: PieceHistoryEntry) => {
-  const diff = entry.diff ?? {}
-  return Object.entries(diff).map(([field, change]) => {
-    const label = historyFieldLabels[field] ?? field
-    const fromLabel = formatHistoryValue(change?.from)
-    const toLabel = formatHistoryValue(change?.to)
-    return {
-      field,
-      label,
-      fromLabel,
-      toLabel,
-    }
-  })
-}
+const historyDiffEntries = (entry: PieceHistoryEntry) =>
+  _historyDiffEntries(entry, historyFieldLabels)
 
 const selectedTypeId = ref<string>('')
 const pieceTypeDetails = ref<any | null>(null)
@@ -623,8 +564,6 @@ const editionForm = reactive({
 const productSelections = ref<(string | null)[]>([])
 
 const customFieldInputs = ref<CustomFieldInput[]>([])
-const documentIcon = (doc: any) =>
-  getFileIcon({ name: doc?.filename || doc?.name, mime: doc?.mimeType })
 const resolvedStructure = computed<PieceModelStructure | null>(() =>
   pieceTypeDetails.value?.structure ?? selectedType.value?.structure ?? null,
 )
@@ -637,52 +576,6 @@ const refreshCustomFieldInputs = (
   const values = valuesOverride ?? piece.value?.customFieldValues ?? null
   customFieldInputs.value = buildCustomFieldInputs(structure, values)
 }
-const formatSize = (size: number | null | undefined) => {
-  if (size === null || size === undefined) {
-    return '—'
-  }
-  if (size === 0) {
-    return '0 B'
-  }
-  const units = ['B', 'KB', 'MB', 'GB']
-  const index = Math.min(units.length - 1, Math.floor(Math.log(size) / Math.log(1024)))
-  const formatted = size / Math.pow(1024, index)
-  return `${formatted.toFixed(1)} ${units[index]}`
-}
-const PDF_PREVIEW_MAX_BYTES = 5 * 1024 * 1024
-const shouldInlinePdf = (document: any) => {
-  if (!document || !isPdfDocument(document) || !document.path) {
-    return false
-  }
-  if (typeof document.size === 'number' && document.size > PDF_PREVIEW_MAX_BYTES) {
-    return false
-  }
-  return true
-}
-const appendPdfViewerParams = (src: string) => {
-  if (!src || src.startsWith('data:')) {
-    return src || ''
-  }
-  if (src.includes('#')) {
-    return `${src}&toolbar=0&navpanes=0`
-  }
-  return `${src}#toolbar=0&navpanes=0`
-}
-const documentPreviewSrc = (document: any) => {
-  if (!document?.path) {
-    return ''
-  }
-  if (isPdfDocument(document)) {
-    return appendPdfViewerParams(document.path)
-  }
-  return document.path
-}
-const documentThumbnailClass = (document: any) => {
-  if (shouldInlinePdf(document) || (isImageDocument(document) && document?.path)) {
-    return 'h-24 w-20'
-  }
-  return 'h-16 w-16'
-}
 const openPreview = (doc: any) => {
   if (!doc || !canPreviewDocument(doc)) {
     return
@@ -694,20 +587,6 @@ const closePreview = () => {
   previewVisible.value = false
   previewDocument.value = null
 }
-const downloadDocument = (doc: any) => {
-  if (!doc?.path) {
-    return
-  }
-  const target = String(doc.path)
-  if (target.startsWith('data:')) {
-    const link = document.createElement('a')
-    link.href = target
-    link.download = doc.filename || doc.name || 'document'
-    link.click()
-    return
-  }
-  window.open(target, '_blank')
-}
 const removeDocument = async (documentId: string | number | null | undefined) => {
   if (!documentId) {
     return
@@ -848,15 +727,7 @@ watch(structureProducts, (products) => {
 })
 
 const requiredCustomFieldsFilled = computed(() =>
-  customFieldInputs.value.every((field) => {
-    if (!field.required) {
-      return true
-    }
-    if (field.type === 'boolean') {
-      return field.value === 'true' || field.value === 'false'
-    }
-    return toFieldString(field.value).trim() !== ''
-  }),
+  _requiredCustomFieldsFilled(customFieldInputs.value),
 )
 
 const canSubmit = computed(() =>
@@ -869,19 +740,6 @@ const canSubmit = computed(() =>
   ),
 )
 
-const toFieldString = (value: unknown): string => {
-  if (value === null || value === undefined) {
-    return ''
-  }
-  if (typeof value === 'string') {
-    return value
-  }
-  if (typeof value === 'number' || typeof value === 'boolean') {
-    return String(value)
-  }
-  return ''
-}
-
 const fetchPiece = async () => {
   const id = route.params.id
   if (!id || typeof id !== 'string') {
@@ -1042,7 +900,15 @@ const submitEdition = async () => {
     const result = await updatePiece(piece.value.id, payload)
     if (result.success) {
       const updatedPiece = result.data
-      await saveCustomFieldValues(updatedPiece)
+      await _saveCustomFieldValues(
+        'piece',
+        updatedPiece.id,
+        [
+          updatedPiece?.typePiece?.pieceCustomFields,
+          updatedPiece?.typeMachinePieceRequirement?.typePiece?.pieceCustomFields,
+        ],
+        { customFieldInputs, upsertCustomFieldValue, updateCustomFieldValue, toast },
+      )
       await router.push('/pieces-catalog')
     }
   } catch (error: any) {
@@ -1052,271 +918,6 @@ const submitEdition = async () => {
   }
 }
 
-const buildCustomFieldInputs = (
-  structure: PieceModelStructure | null,
-  values: any[] | null,
-): CustomFieldInput[] => {
-  const definitions = normalizeCustomFieldInputs(structure)
-  const valueList = Array.isArray(values) ? values : []
-
-  const mapById = new Map<string, any>()
-  const mapByName = new Map<string, any>()
-
-  valueList.forEach((entry) => {
-    if (!entry || typeof entry !== 'object') {
-      return
-    }
-    const fieldId = entry.customField?.id || entry.customFieldId || null
-    if (fieldId) {
-      mapById.set(fieldId, entry)
-    }
-    const fieldName = entry.customField?.name || entry.name || entry.key || null
-    if (fieldName) {
-      mapByName.set(fieldName, entry)
-    }
-  })
-
-  const resolved: CustomFieldInput[] = definitions.map((definition) => {
-    const definitionId = definition.customFieldId || definition.id || null
-    const matched = (definitionId ? mapById.get(definitionId) : null) || mapByName.get(definition.name)
-
-    if (!matched) {
-      return {
-        ...definition,
-        customFieldId: definition.customFieldId || definition.id,
-        customFieldValueId: null,
-        orderIndex: definition.orderIndex,
-      }
-    }
-
-    const resolvedValue = matched.value ?? ''
-    return {
-      ...definition,
-      customFieldId: matched.customField?.id || definition.customFieldId || definition.id,
-      customFieldValueId: matched.id ?? null,
-      value: formatDefaultValue(definition.type, resolvedValue),
-      orderIndex: Math.min(
-        definition.orderIndex ?? 0,
-        typeof matched.customField?.orderIndex === 'number'
-          ? matched.customField.orderIndex
-          : definition.orderIndex ?? 0,
-      ),
-    }
-  }).sort((a, b) => (a.orderIndex ?? 0) - (b.orderIndex ?? 0))
-
-  return resolved
-}
-
-const fieldKey = (field: CustomFieldInput, index: number) =>
-  field.customFieldValueId || field.id || `${field.name}-${index}`
-
-const normalizeCustomFieldInputs = (structure: PieceModelStructure | null): CustomFieldInput[] => {
-  if (!structure || typeof structure !== 'object') {
-    return []
-  }
-  const fields = Array.isArray(structure.customFields) ? structure.customFields : []
-  return fields
-    .map((field, index) => normalizeCustomField(field, index))
-    .filter((field): field is CustomFieldInput => field !== null)
-    .sort((a, b) => a.orderIndex - b.orderIndex)
-}
-
-const normalizeCustomField = (rawField: any, fallbackIndex = 0): CustomFieldInput | null => {
-  if (!rawField || typeof rawField !== 'object') {
-    return null
-  }
-  const name = resolveFieldName(rawField)
-  if (!name) {
-    return null
-  }
-  const type = resolveFieldType(rawField)
-  const required = !!rawField.required
-  const options = Array.isArray(rawField.options)
-    ? rawField.options.filter((option: unknown): option is string => typeof option === 'string')
-    : []
-  const defaultSource = resolveDefaultValue(rawField)
-  const value = formatDefaultValue(type, defaultSource)
-  const id = typeof rawField.id === 'string' ? rawField.id : null
-  const customFieldId = typeof rawField.customFieldId === 'string' ? rawField.customFieldId : id
-  const customFieldValueId = typeof rawField.customFieldValueId === 'string'
-    ? rawField.customFieldValueId
-    : null
-
-  const orderIndex = typeof rawField.orderIndex === 'number' ? rawField.orderIndex : fallbackIndex
-
-  return { id, name, type, required, options, value, customFieldId, customFieldValueId, orderIndex }
-}
-
-const resolveFieldName = (field: any): string => {
-  if (typeof field?.name === 'string' && field.name.trim()) {
-    return field.name.trim()
-  }
-  if (typeof field?.key === 'string' && field.key.trim()) {
-    return field.key.trim()
-  }
-  if (typeof field?.label === 'string' && field.label.trim()) {
-    return field.label.trim()
-  }
-  return ''
-}
-
-const resolveFieldType = (field: any): string => {
-  const allowed = ['text', 'number', 'select', 'boolean', 'date']
-  const value = typeof field?.type === 'string' ? field.type.toLowerCase() : ''
-  return allowed.includes(value) ? value : 'text'
-}
-
-const resolveDefaultValue = (field: any): any => {
-  if (!field || typeof field !== 'object') {
-    return null
-  }
-  if (field.defaultValue !== undefined && field.defaultValue !== null) {
-    return field.defaultValue
-  }
-  if (field.value !== undefined && field.value !== null && typeof field.value !== 'object') {
-    return field.value
-  }
-  if (field.default !== undefined && field.default !== null) {
-    return field.default
-  }
-  if (field.value && typeof field.value === 'object') {
-    if ((field.value as any).defaultValue !== undefined && (field.value as any).defaultValue !== null) {
-      return (field.value as any).defaultValue
-    }
-    if ((field.value as any).value !== undefined && (field.value as any).value !== null && typeof (field.value as any).value !== 'object') {
-      return (field.value as any).value
-    }
-  }
-  return null
-}
-
-const formatDefaultValue = (type: string, defaultValue: any): string => {
-  if (defaultValue === null || defaultValue === undefined) {
-    return ''
-  }
-  if (typeof defaultValue === 'object') {
-    if (defaultValue === null) {
-      return ''
-    }
-    if ('defaultValue' in (defaultValue as Record<string, any>)) {
-      return formatDefaultValue(type, (defaultValue as Record<string, any>).defaultValue)
-    }
-    if ('value' in (defaultValue as Record<string, any>)) {
-      return formatDefaultValue(type, (defaultValue as Record<string, any>).value)
-    }
-    return ''
-  }
-  if (type === 'boolean') {
-    const normalized = String(defaultValue).toLowerCase()
-    if (normalized === 'true' || normalized === '1') {
-      return 'true'
-    }
-    if (normalized === 'false' || normalized === '0') {
-      return 'false'
-    }
-    return ''
-  }
-  return String(defaultValue)
-}
-
-const buildCustomFieldMetadata = (field: CustomFieldInput) => ({
-  customFieldName: field.name,
-  customFieldType: field.type,
-  customFieldRequired: field.required,
-  customFieldOptions: field.options,
-})
-
-const shouldPersistField = (field: CustomFieldInput) => {
-  if (field.type === 'boolean') {
-    return field.value === 'true' || field.value === 'false'
-  }
-  return toFieldString(field.value).trim() !== ''
-}
-
-const formatValueForPersistence = (field: CustomFieldInput) => {
-  if (field.type === 'boolean') {
-    return field.value === 'true' ? 'true' : 'false'
-  }
-  return toFieldString(field.value).trim()
-}
-
-const saveCustomFieldValues = async (updatedPiece: any) => {
-  if (!updatedPiece || !updatedPiece.id) {
-    return
-  }
-
-  const definitionMap = new Map<string, string>()
-  const registerDefinitions = (fields: any[]) => {
-    if (!Array.isArray(fields)) {
-      return
-    }
-    fields.forEach((field) => {
-      if (!field || typeof field !== 'object') {
-        return
-      }
-      const name = typeof field.name === 'string' ? field.name : null
-      const id = typeof field.id === 'string' ? field.id : null
-      if (name && id && !definitionMap.has(name)) {
-        definitionMap.set(name, id)
-      }
-    })
-  }
-
-  registerDefinitions(updatedPiece?.typePiece?.pieceCustomFields)
-  registerDefinitions(updatedPiece?.typeMachinePieceRequirement?.typePiece?.pieceCustomFields)
-
-  const resolveDefinitionId = (field: CustomFieldInput) => {
-    if (field.customFieldId) {
-      return field.customFieldId
-    }
-    if (field.id) {
-      return field.id
-    }
-    return definitionMap.get(field.name) ?? null
-  }
-
-  for (const field of customFieldInputs.value) {
-    if (!shouldPersistField(field)) {
-      continue
-    }
-
-    const definitionId = resolveDefinitionId(field)
-    const metadata = definitionId ? undefined : buildCustomFieldMetadata(field)
-    const value = formatValueForPersistence(field)
-
-    if (field.customFieldValueId) {
-      const result = await updateCustomFieldValue(field.customFieldValueId, { value })
-      if (!result.success) {
-        toast.showError(`Impossible de mettre à jour le champ personnalisé "${field.name}"`)
-      } else if (definitionId && !field.customFieldId) {
-        field.customFieldId = definitionId
-      }
-      continue
-    }
-
-    const result = await upsertCustomFieldValue(
-      definitionId,
-      'piece',
-      updatedPiece.id,
-      value,
-      metadata,
-    )
-
-    if (!result.success) {
-      toast.showError(`Impossible d'enregistrer le champ personnalisé "${field.name}"`)
-    } else {
-      const createdValue = result.data
-      if (createdValue?.id) {
-        field.customFieldValueId = createdValue.id
-      }
-      const resolvedId = createdValue?.customField?.id || definitionId
-      if (resolvedId) {
-        field.customFieldId = resolvedId
-      }
-    }
-  }
-}
-
 onMounted(async () => {
   await Promise.allSettled([loadPieceTypes(), fetchPiece()])
   loading.value = false
diff --git a/app/pages/pieces/create.vue b/app/pages/pieces/create.vue
index b744e2d..e84a4be 100644
--- a/app/pages/pieces/create.vue
+++ b/app/pages/pieces/create.vue
@@ -308,6 +308,13 @@ import { formatPieceStructurePreview } from '~/shared/modelUtils'
 import { uniqueConstructeurIds } from '~/shared/constructeurUtils'
 import type { PieceModelProduct, PieceModelStructure } from '~/shared/types/inventory'
 import type { ModelType } from '~/services/modelTypes'
+import {
+  type CustomFieldInput,
+  fieldKey,
+  normalizeCustomFieldInputs,
+  requiredCustomFieldsFilled as _requiredCustomFieldsFilled,
+  saveCustomFieldValues as _saveCustomFieldValues,
+} from '~/shared/utils/customFieldFormUtils'
 
 interface PieceCatalogType extends ModelType {
   structure: PieceModelStructure | null
@@ -466,15 +473,7 @@ watch(selectedType, (type) => {
 })
 
 const requiredCustomFieldsFilled = computed(() =>
-  customFieldInputs.value.every((field) => {
-    if (!field.required) {
-      return true
-    }
-    if (field.type === 'boolean') {
-      return field.value === 'true' || field.value === 'false'
-    }
-    return toFieldString(field.value).trim() !== ''
-  }),
+  _requiredCustomFieldsFilled(customFieldInputs.value),
 )
 
 const canSubmit = computed(() =>
@@ -487,19 +486,6 @@ const canSubmit = computed(() =>
   ),
 )
 
-const toFieldString = (value: unknown): string => {
-  if (value === null || value === undefined) {
-    return ''
-  }
-  if (typeof value === 'string') {
-    return value
-  }
-  if (typeof value === 'number' || typeof value === 'boolean') {
-    return String(value)
-  }
-  return ''
-}
-
 const clearCreationForm = () => {
   creationForm.name = ''
   creationForm.reference = ''
@@ -558,7 +544,15 @@ const submitCreation = async () => {
   try {
     const result = await createPiece(payload)
     if (result.success) {
-      await saveCustomFieldValues(result.data)
+      await _saveCustomFieldValues(
+        'piece',
+        result.data.id,
+        [
+          result.data?.typePiece?.pieceCustomFields,
+          result.data?.typeMachinePieceRequirement?.typePiece?.pieceCustomFields,
+        ],
+        { customFieldInputs, upsertCustomFieldValue, updateCustomFieldValue, toast },
+      )
       if (selectedDocuments.value.length && result.data?.id) {
         uploadingDocuments.value = true
         const uploadResult = await uploadDocuments(
@@ -593,225 +587,4 @@ onMounted(async () => {
   await loadPieceTypes()
 })
 
-interface CustomFieldInput {
-  id: string | null
-  name: string
-  type: string
-  required: boolean
-  options: string[]
-  value: string
-  customFieldId: string | null
-  customFieldValueId: string | null
-  orderIndex: number
-}
-
-const fieldKey = (field: CustomFieldInput, index: number) =>
-  field.customFieldValueId || field.id || `${field.name}-${index}`
-
-const normalizeCustomFieldInputs = (structure: PieceModelStructure | null): CustomFieldInput[] => {
-  if (!structure || typeof structure !== 'object') {
-    return []
-  }
-  const fields = Array.isArray(structure.customFields) ? structure.customFields : []
-  return fields
-    .map((field, index) => normalizeCustomField(field, index))
-    .filter((field): field is CustomFieldInput => field !== null)
-    .sort((a, b) => a.orderIndex - b.orderIndex)
-}
-
-const normalizeCustomField = (rawField: any, fallbackIndex = 0): CustomFieldInput | null => {
-  if (!rawField || typeof rawField !== 'object') {
-    return null
-  }
-  const name = resolveFieldName(rawField)
-  if (!name) {
-    return null
-  }
-  const type = resolveFieldType(rawField)
-  const required = !!rawField.required
-  const options = Array.isArray(rawField.options)
-    ? rawField.options.filter((option: unknown): option is string => typeof option === 'string')
-    : []
-  const defaultSource = resolveDefaultValue(rawField)
-  const value = formatDefaultValue(type, defaultSource)
-  const id = typeof rawField.id === 'string' ? rawField.id : null
-  const customFieldId = typeof rawField.customFieldId === 'string' ? rawField.customFieldId : id
-  const customFieldValueId = typeof rawField.customFieldValueId === 'string'
-    ? rawField.customFieldValueId
-    : null
-
-  const orderIndex = typeof rawField.orderIndex === 'number' ? rawField.orderIndex : fallbackIndex
-
-  return { id, name, type, required, options, value, customFieldId, customFieldValueId, orderIndex }
-}
-
-const resolveFieldName = (field: any): string => {
-  if (typeof field?.name === 'string' && field.name.trim()) {
-    return field.name.trim()
-  }
-  if (typeof field?.key === 'string' && field.key.trim()) {
-    return field.key.trim()
-  }
-  if (typeof field?.label === 'string' && field.label.trim()) {
-    return field.label.trim()
-  }
-  return ''
-}
-
-const resolveFieldType = (field: any): string => {
-  const allowed = ['text', 'number', 'select', 'boolean', 'date']
-  const value = typeof field?.type === 'string' ? field.type.toLowerCase() : ''
-  return allowed.includes(value) ? value : 'text'
-}
-
-const resolveDefaultValue = (field: any): any => {
-  if (!field || typeof field !== 'object') {
-    return null
-  }
-  if (field.defaultValue !== undefined && field.defaultValue !== null) {
-    return field.defaultValue
-  }
-  if (field.value !== undefined && field.value !== null && typeof field.value !== 'object') {
-    return field.value
-  }
-  if (field.default !== undefined && field.default !== null) {
-    return field.default
-  }
-  if (field.value && typeof field.value === 'object') {
-    if ((field.value as any).defaultValue !== undefined && (field.value as any).defaultValue !== null) {
-      return (field.value as any).defaultValue
-    }
-    if ((field.value as any).value !== undefined && (field.value as any).value !== null && typeof (field.value as any).value !== 'object') {
-      return (field.value as any).value
-    }
-  }
-  return null
-}
-
-const formatDefaultValue = (type: string, defaultValue: any): string => {
-  if (defaultValue === null || defaultValue === undefined) {
-    return ''
-  }
-  if (typeof defaultValue === 'object') {
-    if (defaultValue === null) {
-      return ''
-    }
-    if ('defaultValue' in (defaultValue as Record<string, any>)) {
-      return formatDefaultValue(type, (defaultValue as Record<string, any>).defaultValue)
-    }
-    if ('value' in (defaultValue as Record<string, any>)) {
-      return formatDefaultValue(type, (defaultValue as Record<string, any>).value)
-    }
-    return ''
-  }
-  if (type === 'boolean') {
-    const normalized = String(defaultValue).toLowerCase()
-    if (normalized === 'true' || normalized === '1') {
-      return 'true'
-    }
-    if (normalized === 'false' || normalized === '0') {
-      return 'false'
-    }
-    return ''
-  }
-  return String(defaultValue)
-}
-
-const buildCustomFieldMetadata = (field: CustomFieldInput) => ({
-  customFieldName: field.name,
-  customFieldType: field.type,
-  customFieldRequired: field.required,
-  customFieldOptions: field.options,
-})
-
-const saveCustomFieldValues = async (createdPiece: any) => {
-  if (!createdPiece || !createdPiece.id) {
-    return
-  }
-
-  const definitionMap = new Map<string, string>()
-  const registerDefinitions = (fields: any[]) => {
-    if (!Array.isArray(fields)) {
-      return
-    }
-    fields.forEach((field) => {
-      if (!field || typeof field !== 'object') {
-        return
-      }
-      const name = typeof field.name === 'string' ? field.name : null
-      const id = typeof field.id === 'string' ? field.id : null
-      if (name && id && !definitionMap.has(name)) {
-        definitionMap.set(name, id)
-      }
-    })
-  }
-
-  registerDefinitions(createdPiece?.typePiece?.pieceCustomFields)
-  registerDefinitions(createdPiece?.typeMachinePieceRequirement?.typePiece?.pieceCustomFields)
-
-  const customizeFieldId = (field: CustomFieldInput) => {
-    if (field.customFieldId) {
-      return field.customFieldId
-    }
-    if (field.id) {
-      return field.id
-    }
-    return definitionMap.get(field.name) ?? null
-  }
-
-  for (const field of customFieldInputs.value) {
-    if (!shouldPersistField(field)) {
-      continue
-    }
-
-    const definitionId = customizeFieldId(field)
-    const metadata = definitionId ? undefined : buildCustomFieldMetadata(field)
-    const value = formatValueForPersistence(field)
-
-    if (field.customFieldValueId) {
-      const result = await updateCustomFieldValue(field.customFieldValueId, { value })
-      if (!result.success) {
-        toast.showError(`Impossible de mettre à jour le champ personnalisé "${field.name}"`)
-      } else if (definitionId && !field.customFieldId) {
-        field.customFieldId = definitionId
-      }
-      continue
-    }
-
-    const result = await upsertCustomFieldValue(
-      definitionId,
-      'piece',
-      createdPiece.id,
-      value,
-      metadata,
-    )
-
-    if (!result.success) {
-      toast.showError(`Impossible d'enregistrer le champ personnalisé "${field.name}"`)
-    } else {
-      const createdValue = result.data
-      if (createdValue?.id) {
-        field.customFieldValueId = createdValue.id
-      }
-      const resolvedId = createdValue?.customField?.id || definitionId
-      if (resolvedId) {
-        field.customFieldId = resolvedId
-      }
-    }
-  }
-}
-
-const shouldPersistField = (field: CustomFieldInput) => {
-  if (field.type === 'boolean') {
-    return field.value === 'true' || field.value === 'false'
-  }
-  return toFieldString(field.value).trim() !== ''
-}
-
-const formatValueForPersistence = (field: CustomFieldInput) => {
-  if (field.type === 'boolean') {
-    return field.value === 'true' ? 'true' : 'false'
-  }
-  return toFieldString(field.value).trim()
-}
 </script>
diff --git a/app/pages/product/[id]/edit.vue b/app/pages/product/[id]/edit.vue
index c811798..900f1da 100644
--- a/app/pages/product/[id]/edit.vue
+++ b/app/pages/product/[id]/edit.vue
@@ -402,20 +402,28 @@ import { formatProductStructurePreview, normalizeProductStructureForSave } from
 import { uniqueConstructeurIds } from '~/shared/constructeurUtils'
 import { getModelType } from '~/services/modelTypes'
 import type { ProductModelStructure } from '~/shared/types/inventory'
-import { getFileIcon } from '~/utils/fileIcons'
-import { canPreviewDocument, isImageDocument, isPdfDocument } from '~/utils/documentPreview'
-
-interface CustomFieldInput {
-  id: string | null
-  name: string
-  type: string
-  required: boolean
-  options: string[]
-  value: string
-  customFieldId: string | null
-  customFieldValueId: string | null
-  orderIndex: number
-}
+import { canPreviewDocument } from '~/utils/documentPreview'
+import {
+  type CustomFieldInput,
+  fieldKey,
+  buildCustomFieldInputs,
+  requiredCustomFieldsFilled as _requiredCustomFieldsFilled,
+  saveCustomFieldValues as _saveCustomFieldValues,
+} from '~/shared/utils/customFieldFormUtils'
+import {
+  documentIcon,
+  formatSize,
+  shouldInlinePdf,
+  documentPreviewSrc,
+  documentThumbnailClass,
+  downloadDocument,
+} from '~/shared/utils/documentDisplayUtils'
+import {
+  historyActionLabel,
+  formatHistoryDate,
+  formatHistoryValue,
+  historyDiffEntries as _historyDiffEntries,
+} from '~/shared/utils/historyDisplayUtils'
 
 const route = useRoute()
 const router = useRouter()
@@ -458,75 +466,8 @@ const historyFieldLabels: Record<string, string> = {
   constructeurIds: 'Fournisseurs',
 }
 
-const historyActionLabel = (action: string) => {
-  if (action === 'create') {
-    return 'Création'
-  }
-  if (action === 'delete') {
-    return 'Suppression'
-  }
-  return 'Modification'
-}
-
-const historyDateFormatter = new Intl.DateTimeFormat('fr-FR', {
-  dateStyle: 'medium',
-  timeStyle: 'short',
-})
-
-const formatHistoryDate = (value: string) => {
-  const date = new Date(value)
-  if (Number.isNaN(date.getTime())) {
-    return value
-  }
-  return historyDateFormatter.format(date)
-}
-
-const formatHistoryValue = (value: unknown): string => {
-  if (value === null || value === undefined || value === '') {
-    return '—'
-  }
-  if (Array.isArray(value)) {
-    if (value.length === 0) {
-      return '—'
-    }
-    return value.map((item) => formatHistoryValue(item)).join(', ')
-  }
-  if (typeof value === 'object') {
-    const maybeRecord = value as Record<string, unknown>
-    const name = typeof maybeRecord.name === 'string' ? maybeRecord.name : null
-    const id = typeof maybeRecord.id === 'string' ? maybeRecord.id : null
-    if (name && id) {
-      return `${name} (#${id})`
-    }
-    if (name) {
-      return name
-    }
-    if (id) {
-      return `#${id}`
-    }
-    try {
-      return JSON.stringify(value)
-    } catch (error) {
-      return String(value)
-    }
-  }
-  return String(value)
-}
-
-const historyDiffEntries = (entry: ProductHistoryEntry) => {
-  const diff = entry.diff ?? {}
-  return Object.entries(diff).map(([field, change]) => {
-    const label = historyFieldLabels[field] ?? field
-    const fromLabel = formatHistoryValue(change?.from)
-    const toLabel = formatHistoryValue(change?.to)
-    return {
-      field,
-      label,
-      fromLabel,
-      toLabel,
-    }
-  })
-}
+const historyDiffEntries = (entry: ProductHistoryEntry) =>
+  _historyDiffEntries(entry, historyFieldLabels)
 
 const refreshCustomFieldInputs = (
   structureOverride?: ProductModelStructure | null,
@@ -545,15 +486,7 @@ const editionForm = reactive({
 })
 
 const requiredCustomFieldsFilled = computed(() =>
-  customFieldInputs.value.every((field) => {
-    if (!field.required) {
-      return true
-    }
-    if (field.type === 'boolean') {
-      return field.value === 'true' || field.value === 'false'
-    }
-    return field.value.trim().length > 0
-  }),
+  _requiredCustomFieldsFilled(customFieldInputs.value),
 )
 
 const canSubmit = computed(() =>
@@ -562,60 +495,6 @@ const canSubmit = computed(() =>
 
 const structurePreview = computed(() => formatProductStructurePreview(structure.value))
 
-const documentIcon = (doc: any) =>
-  getFileIcon({ name: doc?.filename || doc?.name, mime: doc?.mimeType })
-
-const formatSize = (size: number | null | undefined) => {
-  if (size === null || size === undefined) {
-    return '—'
-  }
-  if (size === 0) {
-    return '0 B'
-  }
-  const units = ['B', 'KB', 'MB', 'GB']
-  const index = Math.min(units.length - 1, Math.floor(Math.log(size) / Math.log(1024)))
-  const formatted = size / Math.pow(1024, index)
-  return `${formatted.toFixed(1)} ${units[index]}`
-}
-
-const PDF_PREVIEW_MAX_BYTES = 5 * 1024 * 1024
-
-const shouldInlinePdf = (document: any) => {
-  if (!document || !isPdfDocument(document) || !document.path) {
-    return false
-  }
-  if (typeof document.size === 'number' && document.size > PDF_PREVIEW_MAX_BYTES) {
-    return false
-  }
-  return true
-}
-
-const appendPdfViewerParams = (src: string) => {
-  if (!src || src.startsWith('data:')) {
-    return src || ''
-  }
-  if (src.includes('#')) {
-    return `${src}&toolbar=0&navpanes=0`
-  }
-  return `${src}#toolbar=0&navpanes=0`
-}
-
-const documentPreviewSrc = (document: any) => {
-  if (!document?.path) {
-    return ''
-  }
-  if (isPdfDocument(document)) {
-    return appendPdfViewerParams(document.path)
-  }
-  return document.path
-}
-
-const documentThumbnailClass = (document: any) => {
-  if (shouldInlinePdf(document) || (isImageDocument(document) && document?.path)) {
-    return 'h-24 w-20'
-  }
-  return 'h-16 w-16'
-}
 
 const openPreview = (doc: any) => {
   if (!doc || !canPreviewDocument(doc)) {
@@ -630,20 +509,6 @@ const closePreview = () => {
   previewDocument.value = null
 }
 
-const downloadDocument = (doc: any) => {
-  if (!doc?.path) {
-    return
-  }
-  const target = String(doc.path)
-  if (target.startsWith('data:')) {
-    const link = document.createElement('a')
-    link.href = target
-    link.download = doc.filename || doc.name || 'document'
-    link.click()
-    return
-  }
-  window.open(target, '_blank')
-}
 
 const loadProduct = async () => {
   const id = route.params.id
@@ -768,86 +633,6 @@ watch(
   { immediate: true },
 )
 
-const fieldKey = (field: CustomFieldInput, index: number) =>
-  field.customFieldValueId || field.customFieldId || `${field.name}-${index}`
-
-const buildCustomFieldInputs = (
-  productStructure: ProductModelStructure | null,
-  values: any[] | null | undefined,
-): CustomFieldInput[] => {
-  if (!productStructure || typeof productStructure !== 'object') {
-    return []
-  }
-  const definitions = Array.isArray(productStructure.customFields) ? productStructure.customFields : []
-  const valueList = Array.isArray(values) ? values : []
-
-  const byId = new Map<string, any>()
-  const byName = new Map<string, any>()
-
-  valueList.forEach((entry) => {
-    if (!entry || typeof entry !== 'object') {
-      return
-    }
-    const fieldId = entry.customField?.id || entry.customFieldId || null
-    if (fieldId) {
-      byId.set(fieldId, entry)
-    }
-    const fieldName = entry.customField?.name || entry.name || entry.key || null
-    if (fieldName) {
-      byName.set(fieldName, entry)
-    }
-  })
-
-  return definitions
-    .map((definition, index) => {
-      const definitionId = definition.customFieldId || definition.id || null
-      const matched = (definitionId ? byId.get(definitionId) : null) || byName.get(definition.name)
-      const type = typeof definition.type === 'string' ? definition.type : 'text'
-      const options = Array.isArray(definition.options) ? definition.options : []
-      const required = !!definition.required
-      const orderIndex = typeof definition.orderIndex === 'number' ? definition.orderIndex : index
-
-      if (!matched) {
-        return {
-          id: definition.id ?? null,
-          name: definition.name,
-          type,
-          required,
-          options,
-          value: '',
-          customFieldId: definition.customFieldId || definition.id || null,
-          customFieldValueId: null,
-          orderIndex,
-        }
-      }
-
-      const resolvedValue = matched.value ?? ''
-      return {
-        id: definition.id ?? null,
-        name: definition.name,
-        type,
-        required,
-        options,
-        value: formatDefaultValue(type, resolvedValue),
-        customFieldId: matched.customField?.id || definition.customFieldId || definition.id || null,
-        customFieldValueId: matched.id ?? null,
-        orderIndex,
-      }
-    })
-    .filter((field): field is CustomFieldInput => !!field?.name)
-    .sort((a, b) => a.orderIndex - b.orderIndex)
-}
-
-const formatDefaultValue = (type: string, value: any): string => {
-  if (value === null || value === undefined) {
-    return ''
-  }
-  if (type === 'boolean') {
-    return String(value === true || String(value).toLowerCase() === 'true')
-  }
-  return String(value)
-}
-
 const submitEdition = async () => {
   if (!product.value) {
     return
@@ -875,7 +660,12 @@ const submitEdition = async () => {
     const result = await updateProduct(product.value.id, payload)
     if (result.success && result.data?.id) {
       product.value = result.data
-      const failedFields = await saveCustomFieldValues(result.data.id)
+      const failedFields = await _saveCustomFieldValues(
+        'product',
+        result.data.id,
+        [],
+        { customFieldInputs, upsertCustomFieldValue, updateCustomFieldValue, toast },
+      )
       if (failedFields.length) {
         toast.showError(`Impossible d'enregistrer ${failedFields.length} champ(s): ${failedFields.join(', ')}`)
         return
@@ -890,46 +680,6 @@ const submitEdition = async () => {
   }
 }
 
-const saveCustomFieldValues = async (productId: string) => {
-  const failed: string[] = []
-  for (const field of customFieldInputs.value) {
-    const value = field.value ?? ''
-    if (field.customFieldValueId) {
-      const result = await updateCustomFieldValue(field.customFieldValueId, { value })
-      if (!result.success) {
-        failed.push(field.name)
-      }
-      continue
-    }
-
-    const metadata = field.customFieldId
-      ? undefined
-      : { customFieldName: field.name, customFieldType: field.type, customFieldRequired: field.required }
-
-    const result = await upsertCustomFieldValue(
-      field.customFieldId,
-      'product',
-      productId,
-      String(value ?? ''),
-      metadata,
-    )
-
-    if (!result.success) {
-      failed.push(field.name)
-    } else {
-      const createdValue = result.data
-      if (createdValue?.id) {
-        field.customFieldValueId = createdValue.id
-      }
-      const resolvedId = createdValue?.customField?.id || field.customFieldId
-      if (resolvedId) {
-        field.customFieldId = resolvedId
-      }
-    }
-  }
-  return failed
-}
-
 onMounted(async () => {
   await loadProduct()
 })
diff --git a/app/pages/product/create.vue b/app/pages/product/create.vue
index 6b950ff..d088ada 100644
--- a/app/pages/product/create.vue
+++ b/app/pages/product/create.vue
@@ -249,6 +249,10 @@ import { formatProductStructurePreview, normalizeProductStructureForSave } from
 import { uniqueConstructeurIds } from '~/shared/constructeurUtils'
 import type { ProductModelStructure } from '~/shared/types/inventory'
 import type { ModelType } from '~/services/modelTypes'
+import {
+  type CustomFieldInput,
+  normalizeCustomFieldInputs as normalizeCustomFieldInputsFromUtils,
+} from '~/shared/utils/customFieldFormUtils'
 
 interface ProductCatalogType extends ModelType {
   structure: ProductModelStructure | null
@@ -276,17 +280,6 @@ const creationForm = reactive({
 const selectedDocuments = ref<File[]>([])
 const uploadingDocuments = ref(false)
 
-interface CustomFieldInput {
-  id: string | null
-  name: string
-  type: string
-  required: boolean
-  options: string[]
-  value: string
-  customFieldId: string | null
-  orderIndex: number
-}
-
 const customFieldInputs = ref<CustomFieldInput[]>([])
 
 const loadingTypes = computed(() => loadingProductTypes.value)
@@ -337,7 +330,7 @@ watch(selectedType, (type) => {
   if (!creationForm.name) {
     creationForm.name = type.name
   }
-  customFieldInputs.value = normalizeCustomFieldInputs(normalizeProductStructureForSave(type.structure))
+  customFieldInputs.value = normalizeCustomFieldInputsFromUtils(normalizeProductStructureForSave(type.structure))
 })
 
 const requiredCustomFieldsFilled = computed(() =>
@@ -362,49 +355,6 @@ const canSubmit = computed(() => Boolean(
 const fieldKey = (field: CustomFieldInput, index: number) =>
   field.customFieldId || field.id || `${field.name}-${index}`
 
-const normalizeCustomFieldInputs = (structure: ProductModelStructure | null): CustomFieldInput[] => {
-  if (!structure || typeof structure !== 'object') {
-    return []
-  }
-  const fields = Array.isArray(structure.customFields) ? structure.customFields : []
-  return fields
-    .map((field, index) => normalizeCustomField(field, index))
-    .filter((field): field is CustomFieldInput => field !== null)
-    .sort((a, b) => a.orderIndex - b.orderIndex)
-}
-
-const normalizeCustomField = (rawField: any, fallbackIndex = 0): CustomFieldInput | null => {
-  if (!rawField || typeof rawField !== 'object') {
-    return null
-  }
-  const name = typeof rawField.name === 'string' ? rawField.name.trim() : ''
-  if (!name) {
-    return null
-  }
-  const type = typeof rawField.type === 'string' ? rawField.type : 'text'
-  const required = !!rawField.required
-  const options = Array.isArray(rawField.options)
-    ? rawField.options.filter((option: unknown): option is string => typeof option === 'string')
-    : []
-  const defaultSource = rawField.defaultValue ?? rawField.value ?? rawField.default ?? null
-  const value = formatDefaultValue(type, defaultSource)
-  const id = typeof rawField.id === 'string' ? rawField.id : null
-  const customFieldId = typeof rawField.customFieldId === 'string' ? rawField.customFieldId : id
-  const orderIndex = typeof rawField.orderIndex === 'number' ? rawField.orderIndex : fallbackIndex
-
-  return { id, name, type, required, options, value, customFieldId, orderIndex }
-}
-
-const formatDefaultValue = (type: string, defaultValue: any): string => {
-  if (defaultValue === null || defaultValue === undefined) {
-    return ''
-  }
-  if (type === 'boolean') {
-    return String(defaultValue === true || String(defaultValue).toLowerCase() === 'true')
-  }
-  return String(defaultValue)
-}
-
 const clearForm = () => {
   creationForm.name = ''
   creationForm.reference = ''
diff --git a/app/services/modelTypes.ts b/app/services/modelTypes.ts
index 504b96f..182ac5a 100644
--- a/app/services/modelTypes.ts
+++ b/app/services/modelTypes.ts
@@ -75,10 +75,10 @@ function resolveBaseUrl() {
   return runtimeConfig.public.apiBaseUrl || '';
 }
 
-function createOptions<T>(options: FetchOptions<T> = {}) {
+function createOptions(options: Record<string, unknown> = {}): Record<string, unknown> {
   return {
     baseURL: resolveBaseUrl(),
-    credentials: 'include' as const,
+    credentials: 'include',
     ...options,
   };
 }
diff --git a/app/shared/apiRelations.ts b/app/shared/apiRelations.ts
index 3a1b1ac..bd5d291 100644
--- a/app/shared/apiRelations.ts
+++ b/app/shared/apiRelations.ts
@@ -23,7 +23,7 @@ export const extractRelationId = (value: unknown): string | null => {
     }
     if (trimmed.includes('/')) {
       const parts = trimmed.split('/').filter(Boolean);
-      return parts.length ? parts[parts.length - 1] : null;
+      return parts.length ? (parts[parts.length - 1] ?? null) : null;
     }
     return trimmed;
   }
diff --git a/app/shared/constructeurUtils.ts b/app/shared/constructeurUtils.ts
index 1ec3733..c25cbad 100644
--- a/app/shared/constructeurUtils.ts
+++ b/app/shared/constructeurUtils.ts
@@ -20,7 +20,7 @@ const toStringId = (value: unknown): string | null => {
   }
   if (trimmed.includes('/')) {
     const parts = trimmed.split('/').filter(Boolean);
-    return parts.length ? parts[parts.length - 1] : null;
+    return parts.length ? (parts[parts.length - 1] ?? null) : null;
   }
   return trimmed;
 };
diff --git a/app/shared/modelUtils.ts b/app/shared/modelUtils.ts
index 8e0fcef..0da7b3f 100644
--- a/app/shared/modelUtils.ts
+++ b/app/shared/modelUtils.ts
@@ -138,8 +138,8 @@ const sanitizeCustomFields = (fields: any[]): ComponentModelCustomField[] => {
         if (!options && typeof field?.optionsText === 'string') {
           const parsedFromText = field.optionsText
             .split(/\r?\n/)
-            .map((option) => option.trim())
-            .filter((option) => option.length > 0)
+            .map((option: string) => option.trim())
+            .filter((option: string) => option.length > 0)
           options = parsedFromText.length ? parsedFromText : undefined
         }
       }
@@ -917,8 +917,8 @@ const sanitizePieceCustomFields = (fields: any[]): PieceModelCustomField[] => {
             : ''
         const parsed = rawOptions
           .split(/\r?\n/)
-          .map((option) => option.trim())
-          .filter((option) => option.length > 0)
+          .map((option: string) => option.trim())
+          .filter((option: string) => option.length > 0)
         options = parsed.length > 0 ? parsed : undefined
       }
 
@@ -944,7 +944,7 @@ export const normalizePieceStructureForSave = (input: any): PieceModelStructure
   )
   return {
     ...Object.fromEntries(restEntries),
-    products: sanitizePieceProducts(source.products),
+    products: sanitizePieceProducts(source.products || []),
     customFields: sanitizePieceCustomFields(source.customFields),
   }
 }
@@ -974,7 +974,7 @@ export const hydratePieceStructureForEditor = (input: any): PieceModelStructureF
     ...Object.fromEntries(
       Object.entries(source).filter(([key]) => key !== 'customFields' && key !== 'products'),
     ),
-    products: hydrateProducts(source.products) as PieceModelProduct[],
+    products: hydrateProducts(source.products || []) as PieceModelProduct[],
     customFields: hydratePieceCustomFields(source.customFields),
   }
   return payload
diff --git a/app/shared/types/inventory.ts b/app/shared/types/inventory.ts
index c0d3504..b462f91 100644
--- a/app/shared/types/inventory.ts
+++ b/app/shared/types/inventory.ts
@@ -10,6 +10,8 @@ export interface ComponentModelCustomField {
   id?: string
   customFieldId?: string
   orderIndex?: number
+  key?: string
+  value?: unknown
 }
 
 export interface ComponentModelPiece {
@@ -52,6 +54,9 @@ export interface PieceModelCustomField {
   required: boolean
   options?: string[]
   orderIndex?: number
+  key?: string
+  value?: unknown
+  defaultValue?: string | null
 }
 
 export interface PieceModelProduct {
@@ -184,7 +189,7 @@ const validateStructureNode = (
     : []
 
   const subcomponents: ComponentModelStructureNode[] = []
-  rawSubcomponents.forEach((subValue, index) => {
+  rawSubcomponents.forEach((subValue: unknown, index: number) => {
     const parsed = validateStructureNode(subValue, issues, `${path}.subcomponents[${index}]`)
     if (parsed) {
       subcomponents.push(parsed)
@@ -260,6 +265,7 @@ export const componentModelStructureValidator = {
         ...node,
         customFields,
         pieces,
+        products: ((node as unknown) as Record<string, unknown>).products as ComponentModelProduct[] ?? [],
       },
     }
   },
diff --git a/app/shared/utils/customFieldFormUtils.ts b/app/shared/utils/customFieldFormUtils.ts
new file mode 100644
index 0000000..ea962ea
--- /dev/null
+++ b/app/shared/utils/customFieldFormUtils.ts
@@ -0,0 +1,367 @@
+/**
+ * Custom field form normalization, merge, and persistence utilities.
+ *
+ * Extracted from pages/component/create.vue, component/[id]/edit.vue,
+ * pieces/create.vue, pieces/[id]/edit.vue, product/[id]/edit.vue.
+ *
+ * Every create/edit page was shipping its own copy of these helpers –
+ * this module unifies them behind a single, entity-agnostic API.
+ */
+
+// ---------------------------------------------------------------------------
+// Types
+// ---------------------------------------------------------------------------
+
+export interface CustomFieldInput {
+  id: string | null
+  name: string
+  type: string
+  required: boolean
+  options: string[]
+  value: string
+  customFieldId: string | null
+  customFieldValueId: string | null
+  orderIndex: number
+}
+
+export interface SaveCustomFieldDeps {
+  customFieldInputs: { value: CustomFieldInput[] }
+  upsertCustomFieldValue: (
+    definitionId: string | null,
+    entityType: string,
+    entityId: string,
+    value: string,
+    metadata?: Record<string, unknown>,
+  ) => Promise<{ success: boolean; data?: any }>
+  updateCustomFieldValue: (
+    id: string,
+    payload: { value: string },
+  ) => Promise<{ success: boolean }>
+  toast: { showError: (msg: string) => void }
+}
+
+// ---------------------------------------------------------------------------
+// Primitive helpers
+// ---------------------------------------------------------------------------
+
+export const toFieldString = (value: unknown): string => {
+  if (value === null || value === undefined) return ''
+  if (typeof value === 'string') return value
+  if (typeof value === 'number' || typeof value === 'boolean') return String(value)
+  return ''
+}
+
+export const fieldKey = (field: CustomFieldInput, index: number): string =>
+  field.customFieldValueId || field.id || `${field.name}-${index}`
+
+// ---------------------------------------------------------------------------
+// Field resolution helpers
+// ---------------------------------------------------------------------------
+
+export const resolveFieldName = (field: any): string => {
+  if (typeof field?.name === 'string' && field.name.trim()) return field.name.trim()
+  if (typeof field?.key === 'string' && field.key.trim()) return field.key.trim()
+  if (typeof field?.label === 'string' && field.label.trim()) return field.label.trim()
+  return ''
+}
+
+export const resolveFieldType = (field: any): string => {
+  const allowed = ['text', 'number', 'select', 'boolean', 'date']
+  const rawType =
+    typeof field?.type === 'string'
+      ? field.type
+      : typeof field?.value?.type === 'string'
+        ? field.value.type
+        : ''
+  const value = rawType.toLowerCase()
+  return allowed.includes(value) ? value : 'text'
+}
+
+export const resolveRequiredFlag = (field: any): boolean => {
+  if (typeof field?.required === 'boolean') return field.required
+  const nested = field?.value?.required
+  if (typeof nested === 'boolean') return nested
+  if (typeof nested === 'string') {
+    const normalized = nested.toLowerCase()
+    return normalized === 'true' || normalized === '1'
+  }
+  return false
+}
+
+export const resolveOptions = (field: any): string[] => {
+  const sources = [field?.options, field?.value?.options, field?.value?.choices]
+  for (const source of sources) {
+    if (Array.isArray(source)) {
+      const mapped = source
+        .map((option: unknown) => {
+          if (option === null || option === undefined) return ''
+          if (typeof option === 'string') return option.trim()
+          if (typeof option === 'object') {
+            const record = (option || {}) as Record<string, unknown>
+            for (const key of ['value', 'label', 'name']) {
+              const candidate = record[key]
+              if (typeof candidate === 'string' && candidate.trim().length > 0) return candidate.trim()
+            }
+          }
+          const fallback = String(option).trim()
+          return fallback === '[object Object]' ? '' : fallback
+        })
+        .filter((o) => o.length > 0)
+      if (mapped.length) return mapped
+    }
+  }
+  return []
+}
+
+export const resolveDefaultValue = (field: any): any => {
+  if (!field || typeof field !== 'object') return null
+  if (field.defaultValue !== undefined && field.defaultValue !== null) return field.defaultValue
+  if (field.value !== undefined && field.value !== null && typeof field.value !== 'object') return field.value
+  if (field.default !== undefined && field.default !== null) return field.default
+  if (field.value && typeof field.value === 'object') {
+    if (field.value.defaultValue !== undefined && field.value.defaultValue !== null) return field.value.defaultValue
+    if (field.value.value !== undefined && field.value.value !== null && typeof field.value.value !== 'object') return field.value.value
+  }
+  return null
+}
+
+export const formatDefaultValue = (type: string, defaultValue: any): string => {
+  if (defaultValue === null || defaultValue === undefined) return ''
+  if (typeof defaultValue === 'object') {
+    if (defaultValue === null) return ''
+    if ('defaultValue' in (defaultValue as Record<string, any>)) {
+      return formatDefaultValue(type, (defaultValue as Record<string, any>).defaultValue)
+    }
+    if ('value' in (defaultValue as Record<string, any>)) {
+      return formatDefaultValue(type, (defaultValue as Record<string, any>).value)
+    }
+    return ''
+  }
+  if (type === 'boolean') {
+    const normalized = String(defaultValue).toLowerCase()
+    if (normalized === 'true' || normalized === '1') return 'true'
+    if (normalized === 'false' || normalized === '0') return 'false'
+    return ''
+  }
+  return String(defaultValue)
+}
+
+// ---------------------------------------------------------------------------
+// Normalize a single raw custom-field definition into CustomFieldInput
+// ---------------------------------------------------------------------------
+
+export const normalizeCustomField = (rawField: any, fallbackIndex = 0): CustomFieldInput | null => {
+  if (!rawField || typeof rawField !== 'object') return null
+  const name = resolveFieldName(rawField)
+  if (!name) return null
+  const type = resolveFieldType(rawField)
+  const required = resolveRequiredFlag(rawField)
+  const options = resolveOptions(rawField)
+  const defaultSource = resolveDefaultValue(rawField)
+  const value = formatDefaultValue(type, defaultSource)
+  const id = typeof rawField.id === 'string' ? rawField.id : null
+  const customFieldId = typeof rawField.customFieldId === 'string' ? rawField.customFieldId : id
+  const customFieldValueId = typeof rawField.customFieldValueId === 'string' ? rawField.customFieldValueId : null
+  const orderIndex = typeof rawField.orderIndex === 'number' ? rawField.orderIndex : fallbackIndex
+  return { id, name, type, required, options, value, customFieldId, customFieldValueId, orderIndex }
+}
+
+// ---------------------------------------------------------------------------
+// Normalize ALL custom-field definitions from a structure
+// ---------------------------------------------------------------------------
+
+export const normalizeCustomFieldInputs = (structure: any): CustomFieldInput[] => {
+  if (!structure || typeof structure !== 'object') return []
+  const fields = Array.isArray(structure.customFields) ? structure.customFields : []
+  return fields
+    .map((field: any, index: number) => normalizeCustomField(field, index))
+    .filter((field: CustomFieldInput | null): field is CustomFieldInput => field !== null)
+    .sort((a: CustomFieldInput, b: CustomFieldInput) => a.orderIndex - b.orderIndex)
+}
+
+// ---------------------------------------------------------------------------
+// Extract stored value from a persisted custom-field entry
+// ---------------------------------------------------------------------------
+
+export const extractStoredCustomFieldValue = (entry: any): any => {
+  if (entry === null || entry === undefined) return ''
+  if (typeof entry === 'string' || typeof entry === 'number' || typeof entry === 'boolean') return entry
+  if (typeof entry !== 'object') return String(entry)
+
+  const direct = entry.value
+  if (direct !== undefined && direct !== null) {
+    if (typeof direct === 'object') {
+      if (direct === null) return ''
+      if ('value' in direct && direct.value !== undefined && direct.value !== null) return direct.value
+      if ('defaultValue' in direct && direct.defaultValue !== undefined && direct.defaultValue !== null) return direct.defaultValue
+      return ''
+    }
+    return direct
+  }
+  if (entry.defaultValue !== undefined && entry.defaultValue !== null) return entry.defaultValue
+  if (entry.customFieldValue?.value !== undefined && entry.customFieldValue?.value !== null) return entry.customFieldValue.value
+  return ''
+}
+
+// ---------------------------------------------------------------------------
+// Build inputs for edit pages (merge definitions + stored values)
+// ---------------------------------------------------------------------------
+
+export const buildCustomFieldInputs = (
+  structure: any,
+  values: any[] | null | undefined,
+): CustomFieldInput[] => {
+  const definitions = normalizeCustomFieldInputs(structure)
+  const valueList = Array.isArray(values) ? values : []
+
+  const mapById = new Map<string, any>()
+  const mapByName = new Map<string, any>()
+
+  valueList.forEach((entry) => {
+    if (!entry || typeof entry !== 'object') return
+    const fieldId = entry.customField?.id || entry.customFieldId || null
+    if (fieldId) mapById.set(fieldId, entry)
+    const fieldName = entry.customField?.name || entry.name || entry.key || null
+    if (fieldName) mapByName.set(fieldName, entry)
+  })
+
+  return definitions
+    .map((definition) => {
+      const definitionId = definition.customFieldId || definition.id || null
+      const matched = (definitionId ? mapById.get(definitionId) : null) || mapByName.get(definition.name)
+
+      if (!matched) {
+        return {
+          ...definition,
+          customFieldId: definition.customFieldId || definition.id,
+          customFieldValueId: null,
+          orderIndex: definition.orderIndex,
+        }
+      }
+
+      const resolvedValue = extractStoredCustomFieldValue(matched)
+      return {
+        ...definition,
+        customFieldId: matched.customField?.id || definition.customFieldId || definition.id,
+        customFieldValueId: matched.id ?? null,
+        value: formatDefaultValue(definition.type, resolvedValue),
+        orderIndex: Math.min(
+          definition.orderIndex ?? 0,
+          typeof matched.customField?.orderIndex === 'number'
+            ? matched.customField.orderIndex
+            : definition.orderIndex ?? 0,
+        ),
+      }
+    })
+    .sort((a, b) => (a.orderIndex ?? 0) - (b.orderIndex ?? 0))
+}
+
+// ---------------------------------------------------------------------------
+// Validation helpers
+// ---------------------------------------------------------------------------
+
+export const buildCustomFieldMetadata = (field: CustomFieldInput): Record<string, unknown> => ({
+  customFieldName: field.name,
+  customFieldType: field.type,
+  customFieldRequired: field.required,
+  customFieldOptions: field.options,
+})
+
+export const shouldPersistField = (field: CustomFieldInput): boolean => {
+  if (field.type === 'boolean') return field.value === 'true' || field.value === 'false'
+  return toFieldString(field.value).trim() !== ''
+}
+
+export const formatValueForPersistence = (field: CustomFieldInput): string => {
+  if (field.type === 'boolean') return field.value === 'true' ? 'true' : 'false'
+  return toFieldString(field.value).trim()
+}
+
+export const requiredCustomFieldsFilled = (inputs: CustomFieldInput[]): boolean =>
+  inputs.every((field) => {
+    if (!field.required) return true
+    if (field.type === 'boolean') return field.value === 'true' || field.value === 'false'
+    return toFieldString(field.value).trim() !== ''
+  })
+
+// ---------------------------------------------------------------------------
+// Persistence
+// ---------------------------------------------------------------------------
+
+/**
+ * Save custom-field values for an entity.
+ *
+ * @param entityType  - API entity slug ('composant' | 'piece' | 'product')
+ * @param entityId    - ID of the created/updated entity
+ * @param definitionSources - arrays of raw definition objects to build a name→id map
+ * @param deps        - injected composable references
+ * @returns list of field names that failed to save (empty = all OK)
+ */
+export const saveCustomFieldValues = async (
+  entityType: string,
+  entityId: string,
+  definitionSources: any[][],
+  deps: SaveCustomFieldDeps,
+): Promise<string[]> => {
+  if (!entityId) return []
+
+  const definitionMap = new Map<string, string>()
+  const registerDefinitions = (fields: any[]) => {
+    if (!Array.isArray(fields)) return
+    fields.forEach((field) => {
+      if (!field || typeof field !== 'object') return
+      const name = typeof field.name === 'string' ? field.name : null
+      const id = typeof field.id === 'string' ? field.id : null
+      if (name && id && !definitionMap.has(name)) definitionMap.set(name, id)
+    })
+  }
+
+  definitionSources.forEach(registerDefinitions)
+
+  const resolveDefinitionId = (field: CustomFieldInput) => {
+    if (field.customFieldId) return field.customFieldId
+    if (field.id) return field.id
+    return definitionMap.get(field.name) ?? null
+  }
+
+  const failed: string[] = []
+
+  for (const field of deps.customFieldInputs.value) {
+    if (!shouldPersistField(field)) continue
+
+    const definitionId = resolveDefinitionId(field)
+    const metadata = definitionId ? undefined : buildCustomFieldMetadata(field)
+    const value = formatValueForPersistence(field)
+
+    if (field.customFieldValueId) {
+      const result = await deps.updateCustomFieldValue(field.customFieldValueId, { value })
+      if (!result.success) {
+        deps.toast.showError(`Impossible de mettre à jour le champ personnalisé "${field.name}"`)
+        failed.push(field.name)
+      } else if (definitionId && !field.customFieldId) {
+        field.customFieldId = definitionId
+      }
+      continue
+    }
+
+    const result = await deps.upsertCustomFieldValue(
+      definitionId,
+      entityType,
+      entityId,
+      value,
+      metadata,
+    )
+
+    if (!result.success) {
+      deps.toast.showError(`Impossible d'enregistrer le champ personnalisé "${field.name}"`)
+      failed.push(field.name)
+    } else {
+      const createdValue = result.data
+      if (createdValue?.id) field.customFieldValueId = createdValue.id
+      const resolvedId = createdValue?.customField?.id || definitionId
+      if (resolvedId) field.customFieldId = resolvedId
+    }
+  }
+
+  return failed
+}
diff --git a/app/shared/utils/customFieldUtils.ts b/app/shared/utils/customFieldUtils.ts
index 7500edc..28eaf4c 100644
--- a/app/shared/utils/customFieldUtils.ts
+++ b/app/shared/utils/customFieldUtils.ts
@@ -173,6 +173,20 @@ export interface NormalizedCustomFieldDefinition {
   orderIndex: number
 }
 
+export interface NormalizedCustomFieldEntry {
+  customFieldValueId: unknown
+  id: string | undefined
+  customFieldId: string | null
+  name: string
+  type: string
+  required: boolean
+  options: string[]
+  optionsText: string
+  defaultValue: unknown
+  value: string
+  readOnly: boolean
+}
+
 export const normalizeCustomFieldDefinitionEntry = (
   definition: Record<string, unknown> = {},
   fallbackIndex = 0,
@@ -237,8 +251,8 @@ export const mergeCustomFieldValuesWithDefinitions = (
   valueEntries: Record<string, unknown>[] = [],
   ...definitionSources: unknown[][]
 ): Record<string, unknown>[] => {
-  const normalizedValues = (Array.isArray(valueEntries) ? valueEntries : [])
-    .map((entry) => {
+  const normalizedValues: Record<string, unknown>[] = (Array.isArray(valueEntries) ? valueEntries : [])
+    .map((entry): Record<string, unknown> | null => {
       if (!entry || typeof entry !== 'object') return null
       const normalizedDefinition = normalizeCustomFieldDefinitionEntry(
         ((entry as Record<string, unknown>).customField || entry) as Record<string, unknown>,
@@ -265,7 +279,7 @@ export const mergeCustomFieldValuesWithDefinitions = (
         defaultValue: normalizedDefinition.defaultValue ?? '',
         value,
         readOnly: !!(entry as Record<string, unknown>)?.readOnly,
-      }
+      } as Record<string, unknown>
     })
     .filter((entry): entry is Record<string, unknown> => entry !== null)
 
diff --git a/app/shared/utils/documentDisplayUtils.ts b/app/shared/utils/documentDisplayUtils.ts
new file mode 100644
index 0000000..ec8eeac
--- /dev/null
+++ b/app/shared/utils/documentDisplayUtils.ts
@@ -0,0 +1,65 @@
+/**
+ * Document display & preview helpers for edit pages.
+ *
+ * Extracted from pages/component/[id]/edit.vue, pieces/[id]/edit.vue,
+ * product/[id]/edit.vue – each had an identical copy of these utilities.
+ */
+
+import { getFileIcon } from '~/utils/fileIcons'
+import { canPreviewDocument, isImageDocument, isPdfDocument } from '~/utils/documentPreview'
+
+export const PDF_PREVIEW_MAX_BYTES = 5 * 1024 * 1024
+
+export const formatSize = (size: number | null | undefined): string => {
+  if (size === null || size === undefined) return '—'
+  if (size === 0) return '0 B'
+  const units = ['B', 'KB', 'MB', 'GB']
+  const index = Math.min(units.length - 1, Math.floor(Math.log(size) / Math.log(1024)))
+  const formatted = size / Math.pow(1024, index)
+  return `${formatted.toFixed(1)} ${units[index]}`
+}
+
+export const shouldInlinePdf = (doc: any): boolean => {
+  if (!doc || !isPdfDocument(doc) || !doc.path) return false
+  if (typeof doc.size === 'number' && doc.size > PDF_PREVIEW_MAX_BYTES) return false
+  return true
+}
+
+export const appendPdfViewerParams = (src: string): string => {
+  if (!src || src.startsWith('data:')) return src || ''
+  if (src.includes('#')) return `${src}&toolbar=0&navpanes=0`
+  return `${src}#toolbar=0&navpanes=0`
+}
+
+export const documentPreviewSrc = (doc: any): string => {
+  if (!doc?.path) return ''
+  if (isPdfDocument(doc)) return appendPdfViewerParams(doc.path)
+  return doc.path
+}
+
+export const documentThumbnailClass = (doc: any): string => {
+  if (shouldInlinePdf(doc) || (isImageDocument(doc) && doc?.path)) return 'h-24 w-20'
+  return 'h-16 w-16'
+}
+
+export interface FileIconResult {
+  component: unknown
+  colorClass: string
+  label: string
+}
+
+export const documentIcon = (doc: any): FileIconResult =>
+  getFileIcon({ name: doc?.filename || doc?.name, mime: doc?.mimeType })
+
+export const downloadDocument = (doc: any): void => {
+  if (!doc?.path) return
+  const target = String(doc.path)
+  if (target.startsWith('data:')) {
+    const link = document.createElement('a')
+    link.href = target
+    link.download = doc.filename || doc.name || 'document'
+    link.click()
+    return
+  }
+  window.open(target, '_blank')
+}
diff --git a/app/shared/utils/historyDisplayUtils.ts b/app/shared/utils/historyDisplayUtils.ts
new file mode 100644
index 0000000..b768b79
--- /dev/null
+++ b/app/shared/utils/historyDisplayUtils.ts
@@ -0,0 +1,78 @@
+/**
+ * History display utilities for edit pages.
+ *
+ * Extracted from pages/component/[id]/edit.vue, pieces/[id]/edit.vue,
+ * product/[id]/edit.vue – each had an identical copy.
+ */
+
+// ---------------------------------------------------------------------------
+// Formatters
+// ---------------------------------------------------------------------------
+
+export const historyActionLabel = (action: string): string => {
+  if (action === 'create') return 'Création'
+  if (action === 'delete') return 'Suppression'
+  return 'Modification'
+}
+
+const historyDateFormatter = new Intl.DateTimeFormat('fr-FR', {
+  dateStyle: 'medium',
+  timeStyle: 'short',
+})
+
+export const formatHistoryDate = (value: string): string => {
+  const date = new Date(value)
+  if (Number.isNaN(date.getTime())) return value
+  return historyDateFormatter.format(date)
+}
+
+export const formatHistoryValue = (value: unknown): string => {
+  if (value === null || value === undefined || value === '') return '—'
+  if (Array.isArray(value)) {
+    if (value.length === 0) return '—'
+    return value.map((item) => formatHistoryValue(item)).join(', ')
+  }
+  if (typeof value === 'object') {
+    const maybeRecord = value as Record<string, unknown>
+    const name = typeof maybeRecord.name === 'string' ? maybeRecord.name : null
+    const id = typeof maybeRecord.id === 'string' ? maybeRecord.id : null
+    if (name && id) return `${name} (#${id})`
+    if (name) return name
+    if (id) return `#${id}`
+    try {
+      return JSON.stringify(value)
+    } catch {
+      return String(value)
+    }
+  }
+  return String(value)
+}
+
+// ---------------------------------------------------------------------------
+// Diff entries
+// ---------------------------------------------------------------------------
+
+interface DiffChange {
+  from?: unknown
+  to?: unknown
+}
+
+export interface HistoryDiffEntry {
+  field: string
+  label: string
+  fromLabel: string
+  toLabel: string
+}
+
+export const historyDiffEntries = (
+  entry: { diff?: Record<string, DiffChange> | null },
+  fieldLabels: Record<string, string>,
+): HistoryDiffEntry[] => {
+  const diff = entry.diff ?? {}
+  return Object.entries(diff).map(([field, change]) => ({
+    field,
+    label: fieldLabels[field] ?? field,
+    fromLabel: formatHistoryValue(change?.from),
+    toLabel: formatHistoryValue(change?.to),
+  }))
+}
diff --git a/app/types/icons.d.ts b/app/types/icons.d.ts
new file mode 100644
index 0000000..c76cac1
--- /dev/null
+++ b/app/types/icons.d.ts
@@ -0,0 +1,14 @@
+// Type declarations for unplugin-icons
+// This allows TypeScript to understand icon imports from ~icons/*
+
+declare module '~icons/*' {
+  import type { FunctionalComponent, SVGAttributes } from 'vue'
+  const component: FunctionalComponent<SVGAttributes>
+  export default component
+}
+
+declare module '~icons/lucide/*' {
+  import type { FunctionalComponent, SVGAttributes } from 'vue'
+  const component: FunctionalComponent<SVGAttributes>
+  export default component
+}
diff --git a/app/utils/events.ts b/app/utils/events.ts
new file mode 100644
index 0000000..d501d93
--- /dev/null
+++ b/app/utils/events.ts
@@ -0,0 +1,41 @@
+/**
+ * Type-safe event handlers for form inputs.
+ * These helpers extract values from DOM events in a way that satisfies TypeScript.
+ */
+
+/**
+ * Extract the string value from an input event.
+ */
+export const getInputValue = (event: Event): string => {
+  const target = event.target as HTMLInputElement | null
+  return target?.value ?? ''
+}
+
+/**
+ * Extract the numeric value from an input event.
+ */
+export const getInputNumber = (event: Event): number => {
+  const target = event.target as HTMLInputElement | null
+  const value = target?.value ?? ''
+  const parsed = parseFloat(value)
+  return Number.isNaN(parsed) ? 0 : parsed
+}
+
+/**
+ * Extract the checked state from a checkbox event.
+ */
+export const getCheckboxValue = (event: Event): boolean => {
+  const target = event.target as HTMLInputElement | null
+  return target?.checked ?? false
+}
+
+/**
+ * Extract an optional numeric value from an input event (empty string = undefined).
+ */
+export const getOptionalNumber = (event: Event): number | undefined => {
+  const target = event.target as HTMLInputElement | null
+  const value = target?.value ?? ''
+  if (value.trim() === '') return undefined
+  const parsed = parseFloat(value)
+  return Number.isNaN(parsed) ? undefined : parsed
+}
diff --git a/app/utils/formatters/email.ts b/app/utils/formatters/email.ts
index f9978d9..21d7c5b 100644
--- a/app/utils/formatters/email.ts
+++ b/app/utils/formatters/email.ts
@@ -20,8 +20,10 @@ export const maskEmail = (rawValue: string): string => {
     return ''
   }
 
-  const [localPart, domain] = value.split('@')
-  if (!domain) {
+  const parts = value.split('@')
+  const localPart = parts[0] ?? ''
+  const domain = parts[1]
+  if (!domain || !localPart) {
     return value
   }
 
@@ -29,7 +31,7 @@ export const maskEmail = (rawValue: string): string => {
     return `${localPart[0] ?? ''}·@${domain}`
   }
 
-  const start = localPart[0]
+  const start = localPart[0] ?? ''
   const end = localPart.slice(-1)
   const masked = '·'.repeat(Math.max(0, localPart.length - 2))
 
diff --git a/package-lock.json b/package-lock.json
index fffcc3e..423ec18 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -19,6 +19,7 @@
         "@iconify-json/lucide": "^1.2.68",
         "@nuxt/eslint-config": "^1.9.0",
         "@rushstack/eslint-patch": "^1.12.0",
+        "@types/node": "^25.2.1",
         "@typescript-eslint/eslint-plugin": "^8.44.1",
         "@typescript-eslint/parser": "^8.44.1",
         "eslint": "^9.36.0",
@@ -92,7 +93,6 @@
       "resolved": "https://registry.npmjs.org/@babel/core/-/core-7.28.4.tgz",
       "integrity": "sha512-2BCOP7TN8M+gVDj7/ht3hsaO/B/n5oDbiAyyvnRlNOs+u1o+JWNYTQrmpuNp1/Wq2gcFrI01JAW+paEKDMx/CA==",
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "@babel/code-frame": "^7.27.1",
         "@babel/generator": "^7.28.3",
@@ -2087,7 +2087,6 @@
       "resolved": "https://registry.npmjs.org/tailwindcss/-/tailwindcss-3.4.17.tgz",
       "integrity": "sha512-w33E2aCvSDP0tW9RZuNXadXlkHXqFzSkQew/aIa2i/Sj8fThxwovwlXHSPXTbAHwEIhBFXAedUhP2tueAKP8Og==",
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "@alloc/quick-lru": "^5.2.0",
         "arg": "^5.0.2",
@@ -4054,6 +4053,16 @@
       "devOptional": true,
       "license": "MIT"
     },
+    "node_modules/@types/node": {
+      "version": "25.2.1",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-25.2.1.tgz",
+      "integrity": "sha512-CPrnr8voK8vC6eEtyRzvMpgp3VyVRhgclonE7qYi6P9sXwYb59ucfrnmFBTaP0yUi8Gk4yZg/LlTJULGxvTNsg==",
+      "devOptional": true,
+      "license": "MIT",
+      "dependencies": {
+        "undici-types": "~7.16.0"
+      }
+    },
     "node_modules/@types/parse-path": {
       "version": "7.0.3",
       "resolved": "https://registry.npmjs.org/@types/parse-path/-/parse-path-7.0.3.tgz",
@@ -4102,7 +4111,6 @@
       "integrity": "sha512-EHrrEsyhOhxYt8MTg4zTF+DJMuNBzWwgvvOYNj/zm1vnaD/IC5zCXFehZv94Piqa2cRFfXrTFxIvO95L7Qc/cw==",
       "dev": true,
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "@typescript-eslint/scope-manager": "8.44.1",
         "@typescript-eslint/types": "8.44.1",
@@ -4784,7 +4792,6 @@
       "resolved": "https://registry.npmjs.org/@vue/compiler-sfc/-/compiler-sfc-3.5.22.tgz",
       "integrity": "sha512-tbTR1zKGce4Lj+JLzFXDq36K4vcSZbJ1RBu8FxcDv1IGRz//Dh2EBqksyGVypz3kXpshIfWKGOCcqpSbyGWRJQ==",
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "@babel/parser": "^7.28.4",
         "@vue/compiler-core": "3.5.22",
@@ -5004,7 +5011,6 @@
       "resolved": "https://registry.npmjs.org/acorn/-/acorn-8.15.0.tgz",
       "integrity": "sha512-NZyJarBfL7nWwIq+FDL6Zp/yHEhePMNnnJ0y3qfieCrmNvYct8uvtiV41UvlSe6apAfk0fY1FbWx+NwfmpvtTg==",
       "license": "MIT",
-      "peer": true,
       "bin": {
         "acorn": "bin/acorn"
       },
@@ -5422,7 +5428,6 @@
         }
       ],
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "baseline-browser-mapping": "^2.8.3",
         "caniuse-lite": "^1.0.30001741",
@@ -6782,7 +6787,6 @@
       "integrity": "sha512-hB4FIzXovouYzwzECDcUkJ4OcfOEkXTv2zRY6B9bkwjx/cprAq0uvm1nl7zvQ0/TsUk0zQiN4uPfJpB9m+rPMQ==",
       "devOptional": true,
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "@eslint-community/eslint-utils": "^4.8.0",
         "@eslint-community/regexpp": "^4.12.1",
@@ -10094,7 +10098,6 @@
       "integrity": "sha512-6IpQ7mKUxRcZNLIObR0hz7lxsapSSIYNZJwXPGeF0mTVqGKFIXj1DQcMoT22S3ROcLyY/rz0PWaWZ9ayWmad9g==",
       "devOptional": true,
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "deep-is": "^0.1.3",
         "fast-levenshtein": "^2.0.6",
@@ -10141,7 +10144,6 @@
       "resolved": "https://registry.npmjs.org/oxc-parser/-/oxc-parser-0.87.0.tgz",
       "integrity": "sha512-uc47XrtHwkBoES4HFgwgfH9sqwAtJXgAIBq4fFBMZ4hWmgVZoExyn+L4g4VuaecVKXkz1bvlaHcfwHAJPQb5Gw==",
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "@oxc-project/types": "^0.87.0"
       },
@@ -10496,7 +10498,6 @@
         }
       ],
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "nanoid": "^3.3.11",
         "picocolors": "^1.1.1",
@@ -10936,7 +10937,6 @@
       "resolved": "https://registry.npmjs.org/postcss-selector-parser/-/postcss-selector-parser-7.1.0.tgz",
       "integrity": "sha512-8sLjZwK0R+JlxlYcTuVnyT2v+htpdrjDOKuMcOVdYjt52Lh8hWRYpxBPoKx/Zg+bcjc3wx6fmQevMmUztS/ccA==",
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "cssesc": "^3.0.0",
         "util-deprecate": "^1.0.2"
@@ -12481,7 +12481,6 @@
       "resolved": "https://registry.npmjs.org/terser/-/terser-5.44.0.tgz",
       "integrity": "sha512-nIVck8DK+GM/0Frwd+nIhZ84pR/BX7rmXMfYwyg+Sri5oGVE99/E3KvXqpC2xHFxyqXyGHTKBSioxxplrO4I4w==",
       "license": "BSD-2-Clause",
-      "peer": true,
       "dependencies": {
         "@jridgewell/source-map": "^0.3.3",
         "acorn": "^8.15.0",
@@ -12701,7 +12700,6 @@
       "integrity": "sha512-84MVSjMEHP+FQRPy3pX9sTVV/INIex71s9TL2Gm5FG/WG1SqXeKyZ0k7/blY/4FdOzI12CBy1vGc4og/eus0fw==",
       "devOptional": true,
       "license": "Apache-2.0",
-      "peer": true,
       "bin": {
         "tsc": "bin/tsc",
         "tsserver": "bin/tsserver"
@@ -12749,6 +12747,13 @@
         "@types/estree": "^1.0.0"
       }
     },
+    "node_modules/undici-types": {
+      "version": "7.16.0",
+      "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-7.16.0.tgz",
+      "integrity": "sha512-Zz+aZWSj8LE6zoxD+xrjh4VfkIG8Ya6LvYkZqtUQGJPZjYl53ypCaUwWqo7eI0x66KBGeRo+mlBEkMSeSZ38Nw==",
+      "devOptional": true,
+      "license": "MIT"
+    },
     "node_modules/unenv": {
       "version": "2.0.0-rc.21",
       "resolved": "https://registry.npmjs.org/unenv/-/unenv-2.0.0-rc.21.tgz",
@@ -13052,7 +13057,6 @@
       "dev": true,
       "hasInstallScript": true,
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "napi-postinstall": "^0.3.0"
       },
@@ -13299,7 +13303,6 @@
       "resolved": "https://registry.npmjs.org/vite/-/vite-7.1.7.tgz",
       "integrity": "sha512-VbA8ScMvAISJNJVbRDTJdCwqQoAareR/wutevKanhR2/1EkoXVZVkkORaYm/tNVCjP/UDTKtcw3bAkwOUdedmA==",
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "esbuild": "^0.25.0",
         "fdir": "^6.5.0",
@@ -13625,7 +13628,6 @@
       "resolved": "https://registry.npmjs.org/vue/-/vue-3.5.22.tgz",
       "integrity": "sha512-toaZjQ3a/G/mYaLSbV+QsQhIdMo9x5rrqIpYRObsJ6T/J+RyCSFwN2LHNVH9v8uIcljDNa3QzPVdv3Y6b9hAJQ==",
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "@vue/compiler-dom": "3.5.22",
         "@vue/compiler-sfc": "3.5.22",
@@ -13663,7 +13665,6 @@
       "integrity": "sha512-CydUvFOQKD928UzZhTp4pr2vWz1L+H99t7Pkln2QSPdvmURT0MoC4wUccfCnuEaihNsu9aYYyk+bep8rlfkUXw==",
       "dev": true,
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "debug": "^4.4.0",
         "eslint-scope": "^8.2.0",
@@ -13687,7 +13688,6 @@
       "resolved": "https://registry.npmjs.org/vue-router/-/vue-router-4.5.1.tgz",
       "integrity": "sha512-ogAF3P97NPm8fJsE4by9dwSYtDwXIY1nFY9T6DyQnGHd1E2Da94w9JIolpe42LJGIl0DwOHBi8TcRPlPGwbTtw==",
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "@vue/devtools-api": "^6.6.4"
       },
diff --git a/package.json b/package.json
index c0be962..e3cea3a 100644
--- a/package.json
+++ b/package.json
@@ -25,6 +25,7 @@
     "@iconify-json/lucide": "^1.2.68",
     "@nuxt/eslint-config": "^1.9.0",
     "@rushstack/eslint-patch": "^1.12.0",
+    "@types/node": "^25.2.1",
     "@typescript-eslint/eslint-plugin": "^8.44.1",
     "@typescript-eslint/parser": "^8.44.1",
     "eslint": "^9.36.0",