feat: move i18n type utils to lib and describe (#33)

src/lib/index.ts

@@ -0,0 +1 @@
+export * from './types';

src/lib/types.ts

@@ -0,0 +1,33 @@
+/** 
+ * @example type Output = Split<'a.b1' | 'a.b2', '.'>;
+ * // ["a", "b1"] | ["a", "b2"]
+*/
+type Split<S extends string, D extends string> =
+  S extends `${infer A}${D}${infer B}` ? [A, ...Split<B, D>] : [S];
+
+/** 
+ * @example type Output = NestedObject<["a", "b1"] | ["a", "b2"]>;
+ * // { a: { b1: string; }; } | { a: { b2: string; }; }
+*/
+type NestedObject<T extends string[]> =
+  T extends [infer Head, ...infer Tail] ?
+    Head extends string ?
+      { [key in Head]: NestedObject<Tail extends string[] ? Tail : []> } : never :
+    string;
+
+/** 
+ * @example type Output = UnionToIntersection<{ a: { b1: string; }; } | { a: { b2: string; }; }>;
+ * // { a: { b1: string; }; } & { a: { b2: string; }; }
+*/
+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;
+
+/** 
+ * @example type Output = CreateTree<'a.b1' | 'a.b2', '.'>;
+ * // { a: { b1: string; }; } & { a: { b2: string; }; }
+*/
+export type CreateTree<T> =
+  UnionToIntersection<T extends infer U ?
+    U extends string ?
+      NestedObject<Split<U, '.'>> : never : never>;

src/models/i18next.d.ts

@@ -1,24 +1,5 @@
 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;
+import { CreateTree } from '../lib';
 
 type LanguageResource = CreateTree<keyof typeof defaultLocale>;
 
@@ -26,6 +7,6 @@ declare module "i18next" {
   interface CustomTypeOptions {
     resources: {
       '~': LanguageResource
-    };
+    }
   }
 }