fix: ignore root when prerendering using strategy: 'prefix' (#2894)

src/module.ts

@@ -197,6 +197,25 @@ export default defineNuxtModule<NuxtI18nOptions>({
       await setupPages(options, nuxt)
     }
 
+    /**
+     * ignore `/` during prerender when using prefixed routing
+     */
+
+    if (options.strategy === 'prefix' && nuxt.options._generate) {
+      const localizedEntryPages = normalizedLocales.map(x => ['/', x.code].join(''))
+      nuxt.hook('nitro:config', config => {
+        config.prerender ??= {}
+
+        // ignore `/` which is added by nitro by default
+        config.prerender.ignore ??= []
+        config.prerender.ignore.push(/^\/$/)
+
+        // add localized routes as entry pages for prerendering
+        config.prerender.routes ??= []
+        config.prerender.routes.push(...localizedEntryPages)
+      })
+    }
+
     /**
      * setup module alias
      */

src/pages.ts

@@ -57,6 +57,13 @@ export function setupPages(options: Required<NuxtI18nOptions>, nuxt: Nuxt) {
       includeUnprefixedFallback,
       optionsResolver: getRouteOptionsResolver(ctx, options)
     })
+
+    // keep root when using prefixed routing without prerendering
+    const indexPage = pages.find(x => x.path === '/')
+    if (!nuxt.options._generate && options.strategy === 'prefix' && indexPage != null) {
+      localizedPages.unshift(indexPage)
+    }
+
     pages.splice(0, pages.length)
     pages.unshift(...(localizedPages as NuxtPage[]))
     debug('... made pages', pages)