this is not defined in angular

wildstring.js

@@ -1,14 +1,17 @@
 'use strict';
 
-(function (root, definition) {
+var wildstring = (function (name, definition) {
 	if (typeof(module) !== 'undefined') {
 		module.exports = definition();
 	}
 	else if (typeof(define) === 'function' && typeof(define.amd) === 'object') {
 		define(definition);
 	}
+	else if (typeof(this) !== 'undefined') {
+		this[name] = definition();
+	}
 	else {
-		this['wildstring'] = definition();
+		return definition();
 	}
 }('wildstring', function () {