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i18next.config.ts

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+import { defineConfig } from 'i18next-cli';
+import { type Plugin, ExtractedKey } from "i18next-cli";
+import { readFile } from "node:fs/promises";
+
+const HTMLPlugin: Plugin = {
+  name: "html-plugin",
+  async onEnd(keys: Map<string, ExtractedKey>) {
+    const content = await readFile("src/index.html", "utf-8");
+    const matches = content.matchAll(/data-(?:text|tip)="([^"]+)"/g);
+    for (const match of matches) {
+      const key = match[1];
+      keys.set(key, {key, defaultValue: key});
+    }
+  }
+};
+
+export default defineConfig({
+  locales: [
+    "en",
+    "fr"
+  ],
+  extract: {
+    input: "src/**/*.{js,ts}",
+    output: "public/locales/{{language}}/{{namespace}}.json",
+    defaultNS: "lang",
+    keySeparator: false
+  },
+  plugins: [
+    HTMLPlugin
+  ]
+});