feat: init i18n with type hints (#18)

src/models/i18next.d.ts

@@ -0,0 +1,31 @@
+import defaultLocale from '../../locales/ru.json';
+
+type Split<S extends string, D extends string> =
+  S extends `${infer A}${D}${infer B}` ? [A, ...Split<B, D>] : [S];
+
+type NestedObject<T extends string[]> =
+  T extends [infer Head, ...infer Tail] ?
+    Head extends string ?
+      { [key in Head]: NestedObject<Tail extends string[] ? Tail : []> } : never :
+    string;
+
+// Основная утилита для обработки union type
+type CreateTree<T> =
+  UnionToIntersection<T extends infer U ?
+    U extends string ?
+      NestedObject<Split<U, '.'>> : never : never>;
+
+// Утилита для объединения типов
+type UnionToIntersection<U> =
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  (U extends any ? (k: U) => void : never) extends (k: infer I) => void ? I : never;
+
+type LanguageResource = CreateTree<keyof typeof defaultLocale>;
+
+declare module "i18next" {
+  interface CustomTypeOptions {
+    resources: {
+      '~': LanguageResource
+    };
+  }
+}