fix(i18n): make sure namespace params from useTranslation hooks are not passed with empty value

.changeset/breezy-yaks-taste.md

@@ -0,0 +1,5 @@
+---
+"@scaleway/use-i18n": minor
+---
+
+fix: typing issue and force use of string array with at least one element for namespaces in useTranslation hook

biome.json

@@ -32,16 +32,16 @@
     "attributePosition": "auto",
     "includes": [
       "**",
-      "!**/.next/",
-      "!**/coverage/",
-      "!**/node_modules/",
-      "!**/storybook-static",
-      "!**/dist/",
+      "!**/.next/*",
+      "!**/coverage/*",
+      "!**/node_modules/*",
+      "!**/storybook-static/*",
+      "!**/dist/*",
       "!**/pnpm-lock.yaml",
       "!**/package.json",
       "!**/CHANGELOG.md",
       "!**/*.snap",
-      "!**/__snapshots__/"
+      "!**/__snapshots__/*"
     ]
   },
   "javascript": {

packages/use-i18n/src/__tests__/usei18n.test.tsx

@@ -117,7 +117,7 @@ describe('i18n hook', () => {
     const spy = vi.spyOn(console, 'error')
     spy.mockImplementation(() => {})
 
-    expect(() => renderHook(() => useTranslation())).toThrow(
+    expect(() => renderHook(() => useTranslation(['test']))).toThrow(
       new Error('useTranslation must be used within a I18nProvider'),
     )
     spy.mockRestore()
@@ -133,34 +133,41 @@ describe('i18n hook', () => {
     spy.mockRestore()
   })
 
-  it('should use defaultLoad, useTranslation, switch local and translate', async () => {
-    const { result } = renderHook(() => useTranslation<Locale, Locales>([]), {
-      wrapper: wrapper({ defaultLocale: 'en' }),
-    })
-    // first render there is no load
-    expect(result.current.t('title')).toEqual('')
+  it(
+    'should use defaultLoad, useTranslation, switch local and translate',
+    async () => {
+      const { result } = renderHook(
+        () => useTranslation<Locale, Locales>(['test']),
+        {
+          wrapper: wrapper({ defaultLocale: 'en' }),
+        },
+      )
+      // first render there is no load
+      expect(result.current.t('title')).toEqual('')
 
-    await waitFor(() => {
-      // after load of en locale
-      expect(result.current.t('title')).toEqual(en.title)
-    })
+      await waitFor(() => {
+        // after load of en locale
+        expect(result.current.t('title')).toEqual(en.title)
+      })
 
-    await act(async () => {
-      await result.current.switchLocale('fr')
-    })
+      await act(async () => {
+        await result.current.switchLocale('fr')
+      })
 
-    await waitFor(() => {
-      expect(result.current.t('title')).toEqual(fr.title)
-    })
+      await waitFor(() => {
+        expect(result.current.t('title')).toEqual(fr.title)
+      })
 
-    await act(async () => {
-      await result.current.switchLocale('es')
-    })
+      await act(async () => {
+        await result.current.switchLocale('es')
+      })
 
-    await waitFor(() => {
-      expect(result.current.t('title')).toEqual(es.title)
-    })
-  })
+      await waitFor(() => {
+        expect(result.current.t('title')).toEqual(es.title)
+      })
+    },
+    {},
+  )
 
   it('should use specific load on useTranslation', async () => {
     const { result } = renderHook(
@@ -262,7 +269,8 @@ describe('i18n hook', () => {
 
   it('should work with a component', async () => {
     const { result } = renderHook(
-      () => useTranslation<{ 'with.identifier': 'Hello {identifier}' }>([]),
+      () =>
+        useTranslation<{ 'with.identifier': 'Hello {identifier}' }>(['test']),
       {
         wrapper: wrapper({ defaultLocale: 'en' }),
       },

packages/use-i18n/src/usei18n.tsx

@@ -151,7 +151,7 @@ export function useTranslation<
   LocaleParam extends BaseLocale = {},
   LocalSupportedType extends string = '',
 >(
-  namespaces: string[] = [],
+  namespaces: [string, ...string[]],
   load: LoadTranslationsFn<LocalSupportedType> | undefined = undefined,
 ): RequiredGenericContext<LocaleParam, LocalSupportedType> & {
   isLoaded: boolean
@@ -162,6 +162,8 @@ export function useTranslation<
   }
   const { loadTranslations, namespaces: loadedNamespaces } = context
 
+  // here we generate a key string from the array of namespace in order to only trigger the use effect
+  // when the passed keys change and not when the ref of the array change
   const key = namespaces.join(',')
   useEffect(() => {
     // eslint-disable-next-line @typescript-eslint/no-floating-promises