Add TypeScript .d.ts file for type checking

Readme.md

@@ -204,6 +204,10 @@ Path-To-RegExp breaks compatibility with Express <= `4.x`:
   * Other RegExp features are not support - no nested matching groups, non-capturing groups or look aheads
 * Parameters have suffixes that augment meaning - `*`, `+` and `?`. E.g. `/:user*`
 
+## TypeScript
+
+Includes a [`.d.ts`](index.d.ts) file for TypeScript users.
+
 ## Live Demo
 
 You can see a live demo of this library in use at [express-route-tester](http://forbeslindesay.github.com/express-route-tester/).

index.d.ts

@@ -0,0 +1,53 @@
+declare function pathToRegexp (path: pathToRegexp.Path, options?: pathToRegexp.Options): pathToRegexp.PathRegExp;
+declare function pathToRegexp (path: pathToRegexp.Path, keys: pathToRegexp.Token[], options?: pathToRegexp.Options): pathToRegexp.PathRegExp;
+
+declare namespace pathToRegexp {
+  export interface PathRegExp extends RegExp {
+    // An array to be populated with the keys found in the path.
+    keys: Key[];
+  }
+
+  export interface Options {
+    // When `true` the route will be case sensitive. (default: `false`)
+    sensitive: boolean;
+    // When `false` the trailing slash is optional. (default: `false`)
+    strict: boolean;
+    // When `false` the path will match at the beginning. (default: `true`)
+    end: boolean;
+  }
+
+  /**
+   * Parse an Express-style path into an array of tokens.
+   */
+  export function parse (path: string): Token[];
+
+  /**
+   * Transforming an Express-style path into a valid path.
+   */
+  export function compile (path: string): PathFunction;
+
+  /**
+   * Transform an array of tokens into a path generator function.
+   */
+  export function tokensToFunction (tokens: Token[]): PathFunction;
+
+  /**
+   * Transform an array of tokens into a matching regular expression.
+   */
+  export function tokensToRegExp (tokens: Token[], options?: Options): PathRegExp;
+
+  export interface Key {
+    name: string | number;
+    prefix: string;
+    delimiter: string;
+    optional: boolean;
+    repeat: boolean;
+    pattern: string;
+  }
+
+  export type Token = string | Key;
+  export type Path = string | RegExp | Array<string | RegExp>;
+  export type PathFunction = (data?: Object) => string;
+}
+
+export = pathToRegexp;

package.json

@@ -2,6 +2,8 @@
   "name": "path-to-regexp",
   "description": "Express style path to RegExp utility",
   "version": "1.2.1",
+  "main": "index.js",
+  "typings": "index.d.ts",
   "files": [
     "index.js",
     "LICENSE"