diff --git a/jquery.transit/jquery.transit-tests.ts b/jquery.transit/jquery.transit-tests.ts
new file mode 100644
index 000000000..9df0397d0
--- /dev/null
+++ b/jquery.transit/jquery.transit-tests.ts
@@ -0,0 +1,93 @@
+///<reference path="../jquery/jquery-1.8.d.ts" />
+///<reference path="jquery.transit.d.ts" />
+
+
+class TransitOptions implements JQueryTransitOptions {
+	opacity: number;
+	duration: number;
+	delay: number;
+	easing: string;
+	complete: () => void;
+	scale: any;
+}
+
+$(document).ready(function () {
+	test_opacity();
+	test_scale();
+	test_duration();
+	// Wait for all tests to complete and report results
+	setTimeout(Assert.Results, 2000);
+});
+
+class Assert {
+	static totalTests: number = 0;
+	static passedTests: number = 0;
+
+	static Results() {
+		console.log('Tests succeeded - ' + passedTests + '/' + totalTests + '; Tests failed - ' + (totalTests - passedTests) + '/' + totalTests);
+	}
+
+	static AssertionFailed(actual: any, expected: any, test: string) {
+		console.log((test || '') + ' assertion failed -- expected ' + expected.toString() + '; actual ' + actual.toString());
+	}
+
+	static Equal(actual: any, expected: any, test?: string) {
+		totalTests++;
+		if (actual === expected) {
+			passedTests++;
+			return;
+		}
+		AssertionFailed(actual, expected, test);
+	}
+
+	static NotEqual(actual: any, expected: any, test?: string) {
+		totalTests++;
+		if (actual !== expected) {
+			passedTests++;
+			return;
+		}
+		AssertionFailed(actual, expected, test);
+	}
+}
+
+function test_signatures() {
+	var TestObject = $('<div>');
+	var options = new TransitOptions();
+	options.opacity = 50;
+	options.duration = 250;
+
+	TestObject.css("scale", 2);
+
+	TestObject.transition(options);
+	TestObject.transition(options, 500);
+	TestObject.transition(options, 'in');
+	TestObject.transition(options, function () { var test: bool = true; });
+	TestObject.transition(options, 500, 'out');
+	TestObject.transition(options, 500, 'in-out', function () { var test: bool = true; });
+}
+
+function test_opacity() {
+	var TestObject = $('<div>');
+	TestObject.css('opacity', 25);
+	Assert.Equal(TestObject.attr('style'), 'opacity: 25;', 'Opacity pre-transition test');
+	TestObject.transition({ opacity: 75, duration: 1, complete: function () { Assert.Equal(TestObject.attr('style'), 'opacity: 75;', 'Opacity transition test'); } });
+}
+
+function test_scale() {
+	var TestObject = $('<div>');
+	TestObject.css('scale', 0.5);
+	Assert.Equal(TestObject.attr('style'), 'transform: scale(0.5, 0.5);', 'Scale pre-transition test');
+	TestObject.transition({ scale: 2, duration: 1, complete: function () { Assert.Equal(TestObject.attr('style'), 'transform: scale(2, 2);', 'Scale transition test'); } });
+	TestObject.css('scale', [0.5, 1.0]);
+	Assert.Equal(TestObject.attr('style'), 'transform: scale(0.5, 1);', 'Scale pre-transition test');
+	TestObject.transition({ scale: [2, 3], duration: 1, complete: function () { Assert.Equal(TestObject.attr('style'), 'transform: scale(2, 3);', 'Scale transition test'); } });
+}
+
+function test_duration() {
+	var TestObject = $('<div>');
+	TestObject.css('opacity', 25);
+	Assert.Equal(TestObject.attr('style'), 'opacity: 25;', 'Duration pre-transition test');
+	TestObject.transition({ opacity: 75, duration: 1000, complete: function () { Assert.Equal(TestObject.attr('style'), 'opacity: 75;', 'Duration post-transition test'); } });
+	// Test the transitions state partway through and assert that we're not to our final state yet.
+	setTimeout(function () { Assert.NotEqual(TestObject.attr('style'), 'opacity: 75;', 'Duration intra-transition test'); }, 300);
+}
diff --git a/jquery.transit/jquery.transit.d.ts b/jquery.transit/jquery.transit.d.ts
new file mode 100644
index 000000000..50a234d89
--- /dev/null
+++ b/jquery.transit/jquery.transit.d.ts
@@ -0,0 +1,25 @@
+// Type definitions for jQuery.transit.js
+
+/// <reference path="../jquery/jquery-1.8.d.ts"/>
+
+// Transit //////////////////////////////////////////////////
+
+interface JQueryTransitOptions {
+	opacity?: number;
+	duration?: number;
+	delay?: number;
+	easing?: string;
+	complete?: () => void;
+	scale?: any;
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+interface JQuery {
+    transition(options: JQueryTransitOptions): JQuery;
+    transition(options: JQueryTransitOptions, duration: number): JQuery;
+    transition(options: JQueryTransitOptions, easing: string): JQuery;
+    transition(options: JQueryTransitOptions, duration: number, easing: string): JQuery;
+    transition(options: JQueryTransitOptions, complete: () => void): JQuery;
+    transition(options: JQueryTransitOptions, duration: number, easing: string, complete: () => void): JQuery;
+}