Switch to external module import syntax.

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

@@ -1,6 +1,6 @@
 /// <reference path="escape-string-regexp.d.ts"/>
 
-import escapeStringRegexp from 'escape-string-regexp';
+import escapeStringRegexp = require('escape-string-regexp');
 
 var inputString: string = '^abc$';
 var outputString: string;

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

@@ -4,7 +4,9 @@
 // Definitions: https://github.com/borisyankov/DefinitelyTyped
 
 declare module "escape-string-regexp" {
-  
-  export default function (str: string): string;
-  
+
+  function escapeStringRegexp(str: string): string;
+
+  export = escapeStringRegexp;
+
 }