Add escape-string-regexp type definition.

escape-string-regexp/escape-string-regexp-tests.ts

@@ -0,0 +1,8 @@
+/// <reference path="escape-string-regexp.d.ts"/>
+
+import escapeStringRegexp from 'escape-string-regexp';
+
+var inputString: string = '^abc$';
+var outputString: string;
+
+outputString = escapeStringRegexp(inputString);

escape-string-regexp/escape-string-regexp.d.ts

@@ -0,0 +1,10 @@
+// Type definitions for escape-string-regexp
+// Project: https://github.com/sindresorhus/escape-string-regexp
+// Definitions by: kruncher <https://github.com/kruncher/>
+// Definitions: https://github.com/borisyankov/DefinitelyTyped
+
+declare module "escape-string-regexp" {
+  
+  export default function (str: string): string;
+  
+}