feat: set locale domains via runtimeConfig (nuxt-modules#2443)

docs/content/2.guide/10.different-domains.md

@@ -109,3 +109,19 @@ export default defineNuxtConfig({
   // ...
 })
 ```
+
+With the above config, a build would have to be run for staging and production with different .env files that specify `DOMAIN_UK` and `DOMAIN_FR`.
+
+Alternatively, to avoid the need for multiple builds, the locale domains can be overridden via runtime environment variables. The variable name should follow the format `NUXT_PUBLIC_I18N_LOCALES_{locale code}_DOMAIN`
+
+For example:
+
+```env {}[production .env]
+NUXT_PUBLIC_I18N_LOCALES_UK_DOMAIN=uk.example.test
+NUXT_PUBLIC_I18N_LOCALES_FR_DOMAIN=fr.example.test
+```
+
+```env {}[staging .env]
+NUXT_PUBLIC_I18N_LOCALES_UK_DOMAIN=uk.staging.example.test
+NUXT_PUBLIC_I18N_LOCALES_FR_DOMAIN=fr.staging.example.test
+```

docs/content/3.options/2.routing.md

@@ -43,7 +43,7 @@ When using an object form, the properties can be:
 - `file` - The name of the file. Will be resolved relative to `langDir` path when loading locale messages from file.
 - `files` - The name of the file in which multiple locale messages are defined. Will be resolved relative to `langDir` path when loading locale messages from file.
 - `dir` - The dir property specifies the direction of the elements and content, value could be `'rtl'`, `'ltr'` or `'auto'`.
-- `domain` (required when using [`differentDomains`](/options/domain#differentdomains)) - the domain name you'd like to use for that locale (including the port if used)
+- `domain` (required when using [`differentDomains`](/options/domain#differentdomains)) - the domain name you'd like to use for that locale (including the port if used). This property can also be set using [`runtimeConfig`](./runtime-config).
 - `...` - any custom property set on the object will be exposed at runtime. This can be used, for example, to define the language name for the purpose of using it in a language selector on the page.
 
 You can access all the properties of the current locale through the `localeProperties` property. When using an array of codes, it will only include the `code` property.

docs/content/3.options/9.runtime-config.md

@@ -27,6 +27,7 @@ export default defineNuxtConfig({
         experimental: {
           jsTsFormatResource: true,
         },
+        locales: {},
         // other options ...
       }
     }
@@ -66,3 +67,9 @@ Note that the `baseUrl` module option allows you to set the function, but the ru
 * key: `NUXT_PUBLIC_I18N_EXPERIMENTAL_JS_TS_FORMAT_RESOURCE`
 
 This runtime config option is the same as the [`experimental`](./misc#experimental) module option.
+
+### `locales`
+* property: `locales[code].domain`
+* key: `NUXT_PUBLIC_I18N_LOCALES_{code}_DOMAIN`
+
+This runtime config option allows overriding the domain set in the [`locales`](./routing#locales) module option.

specs/different_domains.runtimeConfig.spec.ts

@@ -0,0 +1,60 @@
+import { test, expect } from 'vitest'
+import { fileURLToPath } from 'node:url'
+import { setup, $fetch } from './utils'
+import { getDom } from './helper'
+
+await setup({
+  rootDir: fileURLToPath(new URL(`./fixtures/domain`, import.meta.url)),
+  // overrides
+  nuxtConfig: {
+    runtimeConfig: {
+      public: {
+        i18n: {
+          locales: {
+            en: {
+              domain: 'en.staging.nuxt-app.localhost'
+            },
+            fr: {
+              domain: 'fr.staging.nuxt-app.localhost'
+            }
+          }
+        }
+      }
+    },
+    i18n: {
+      locales: [
+        {
+          code: 'en',
+          iso: 'en',
+          name: 'English',
+          domain: 'en.nuxt-app.localhost'
+        },
+        {
+          code: 'fr',
+          iso: 'fr-FR',
+          name: 'Français',
+          domain: 'fr.nuxt-app.localhost'
+        }
+      ],
+      differentDomains: true,
+      detectBrowserLanguage: {
+        useCookie: true
+      }
+    }
+  }
+})
+
+test('pass `<NuxtLink> to props using domains from runtimeConfig', async () => {
+  const html = await $fetch('/', {
+    headers: {
+      Host: 'fr.nuxt-app.localhost'
+    }
+  })
+  const dom = getDom(html)
+  expect(dom.querySelector('#switch-locale-path-usages .switch-to-en a').getAttribute('href')).toEqual(
+    `http://en.staging.nuxt-app.localhost`
+  )
+  expect(dom.querySelector('#switch-locale-path-usages .switch-to-fr a').getAttribute('href')).toEqual(
+    `http://fr.staging.nuxt-app.localhost`
+  )
+})

src/module.ts

@@ -135,7 +135,18 @@ export default defineNuxtModule<NuxtI18nOptions>({
     // for public
     nuxt.options.runtimeConfig.public.i18n = defu(nuxt.options.runtimeConfig.public.i18n, {
       experimental: options.experimental,
-      baseUrl: options.baseUrl
+      baseUrl: options.baseUrl,
+      locales: options.locales.reduce(
+        (obj, locale) => {
+          if (typeof locale === 'string') {
+            obj[locale] = { domain: undefined }
+          } else {
+            obj[locale.code] = { domain: locale.domain }
+          }
+          return obj
+        },
+        {} as Record<string, { domain: string | undefined }>
+      )
       // TODO: we should support more i18n module options. welcome PRs :-)
     })
 

src/runtime/internal.ts

@@ -490,10 +490,13 @@ export function getLocaleDomain(locales: LocaleObject[]): string {
 
 export function getDomainFromLocale(localeCode: Locale, locales: LocaleObject[], nuxt?: NuxtApp): string | undefined {
   // lookup the `differentDomain` origin associated with given locale.
+  const config = nuxt?.$config.public.i18n as { locales?: Record<Locale, { domain?: string }> }
   const lang = locales.find(locale => locale.code === localeCode)
-  if (lang && lang.domain) {
-    if (hasProtocol(lang.domain)) {
-      return lang.domain
+  const domain = config?.locales?.[localeCode]?.domain ?? lang?.domain
+
+  if (domain) {
+    if (hasProtocol(domain, { strict: true })) {
+      return domain
     }
     let protocol
     if (process.server) {
@@ -504,7 +507,7 @@ export function getDomainFromLocale(localeCode: Locale, locales: LocaleObject[],
     } else {
       protocol = new URL(window.location.origin).protocol
     }
-    return protocol + '//' + lang.domain
+    return protocol + '//' + domain
   }
 
   console.warn(formatMessage('Could not find domain name for locale ' + localeCode))

src/runtime/utils.ts

@@ -464,7 +464,7 @@ export function extendPrefixable(differentDomains: boolean) {
 export function extendSwitchLocalePathIntercepter(
   differentDomains: boolean,
   normalizedLocales: LocaleObject[],
-  nuxt?: NuxtApp
+  nuxt: NuxtApp
 ): SwitchLocalePathIntercepter {
   return (path: string, locale: Locale): string => {
     if (differentDomains) {