added unit testing, and started implementing unit tests...phew

node_modules/async/nextTick.js

@@ -0,0 +1,51 @@
+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+    value: true
+});
+
+var _setImmediate = require('./internal/setImmediate');
+
+/**
+ * Calls `callback` on a later loop around the event loop. In Node.js this just
+ * calls `process.nextTick`.  In the browser it will use `setImmediate` if
+ * available, otherwise `setTimeout(callback, 0)`, which means other higher
+ * priority events may precede the execution of `callback`.
+ *
+ * This is used internally for browser-compatibility purposes.
+ *
+ * @name nextTick
+ * @static
+ * @memberOf module:Utils
+ * @method
+ * @see [async.setImmediate]{@link module:Utils.setImmediate}
+ * @category Util
+ * @param {Function} callback - The function to call on a later loop around
+ * the event loop. Invoked with (args...).
+ * @param {...*} args... - any number of additional arguments to pass to the
+ * callback on the next tick.
+ * @example
+ *
+ * var call_order = [];
+ * async.nextTick(function() {
+ *     call_order.push('two');
+ *     // call_order now equals ['one','two']
+ * });
+ * call_order.push('one');
+ *
+ * async.setImmediate(function (a, b, c) {
+ *     // a, b, and c equal 1, 2, and 3
+ * }, 1, 2, 3);
+ */
+var _defer;
+
+if (_setImmediate.hasNextTick) {
+    _defer = process.nextTick;
+} else if (_setImmediate.hasSetImmediate) {
+    _defer = setImmediate;
+} else {
+    _defer = _setImmediate.fallback;
+}
+
+exports.default = (0, _setImmediate.wrap)(_defer);
+module.exports = exports['default'];