[improvement] mixins typescript (#3690)

src/utils/create/bem.ts

@@ -47,3 +47,5 @@ export function createBEM(name: string) {
     return mods ? [el, prefix(el, mods)] : el;
   };
 }
+
+export type BEM = ReturnType<typeof createBEM>;

src/utils/create/i18n.ts

@@ -10,3 +10,5 @@ export function createI18N(name: string) {
     return typeof message === 'function' ? message(...args) : message;
   };
 }
+
+export type Translate = ReturnType<typeof createI18N>;

src/utils/create/index.ts

@@ -1,11 +1,11 @@
-import { createBEM } from './bem';
+import { createBEM, BEM } from './bem';
 import { createComponent } from './component';
-import { createI18N } from './i18n';
+import { createI18N, Translate } from './i18n';
 
 type CreateNamespaceReturn = [
   ReturnType<typeof createComponent>,
-  ReturnType<typeof createBEM>,
-  ReturnType<typeof createI18N>
+  BEM,
+  Translate
 ];
 
 export function createNamespace(name: string): CreateNamespaceReturn {