多语言优化

src/i18n/global.d.ts

@@ -0,0 +1,8 @@
+import type enMessages from "@/i18n/messages/en.json"
+
+declare module "next-intl" {
+  interface AppConfig {
+    Locale: "en" | "zh-CN" | "zh-TW"
+    Messages: typeof enMessages
+  }
+}

src/i18n/messages.ts

@@ -0,0 +1,34 @@
+import type { AbstractIntlMessages } from "next-intl"
+import enMessages from "@/i18n/messages/en.json"
+import type { AppLocale } from "@/lib/types"
+
+const MESSAGE_CACHE = new Map<AppLocale, AbstractIntlMessages>([
+  ["en", enMessages],
+])
+
+async function loadMessages(locale: AppLocale): Promise<AbstractIntlMessages> {
+  switch (locale) {
+    case "zh_cn":
+      return (await import("@/i18n/messages/zh-CN.json")).default
+    case "zh_tw":
+      return (await import("@/i18n/messages/zh-TW.json")).default
+    case "en":
+    default:
+      return enMessages
+  }
+}
+
+export function getFallbackMessages(): AbstractIntlMessages {
+  return enMessages
+}
+
+export async function getMessagesForLocale(
+  locale: AppLocale
+): Promise<AbstractIntlMessages> {
+  const cached = MESSAGE_CACHE.get(locale)
+  if (cached) return cached
+
+  const messages = await loadMessages(locale)
+  MESSAGE_CACHE.set(locale, messages)
+  return messages
+}