Add typings for the mkpath library

mkpath/mkpath.d.ts

@@ -0,0 +1,15 @@
+// Type definitions for mkpath v0.1.0
+// Project: https://www.npmjs.com/package/mkpath
+// Definitions by: Jared Klopper <https://github.com/optical>
+// Definitions: https://github.com/borisyankov/DefinitelyTyped
+
+declare module 'mkpath' {
+  module mkpath {
+    function sync(path: string, mode?: number): void;
+  }
+
+  function mkpath(path: string, callback?: (err: any) => void): void;
+  function mkpath(path: string, mode?: number, callback?: (err?: any) => void): void;
+
+  export = mkpath;
+}