Fix type error caused by module augmentation

Author: sapphi-red

index.d.ts

@@ -50,5 +50,3 @@ declare interface PostcssModulesPlugin {
 declare const PostcssModulesPlugin: PostcssModulesPlugin;
 
 export = PostcssModulesPlugin;
-
-declare module "postcss-modules/loader" {}

loader.d.ts

@@ -0,0 +1 @@
+export {}

package.json

@@ -9,7 +9,10 @@
 			"types": "./index.d.ts",
 			"default": "./build/index.js"
 		},
-		"./loader": "./build/loader.mjs",
+		"./loader": {
+			"types": "./loader.d.ts",
+			"default": "./build/loader.mjs"
+		},
 		"./package.json": "./package.json"
 	},
 	"keywords": [