feat: add ts definition

Author: clarkdo

index.d.ts

@@ -0,0 +1,8 @@
+
+import { ResolverFactory } from 'enhanced-resolve'
+
+declare function resolver(config: ResolverFactory.ResolverOption): Function;
+
+declare module 'postcss-import-resolver' {
+  export = resolver;
+}

package.json

@@ -3,6 +3,7 @@
   "version": "1.1.0",
   "description": "Customize postcss-import resolve with enhanced-resolve",
   "main": "index.js",
+  "types": "index.d.ts",
   "repository": "git+https://github.com/clarkdo/postcss-import-resolver.git",
   "author": "Clark Du",
   "license": "MIT",