adding catch onto Thenable, updating tests

es6-promise/es6-promise-tests.ts

@@ -68,6 +68,9 @@ promiseNumber = thenWithUndefinedFullFillAndPromiseReject;
 var thenWithNoResultAndNoReject = promiseString.then<number>();
 promiseNumber = thenWithNoResultAndNoReject;
 
+var catchAfterThen = promiseString.then().catch<number>();
+promiseNumber = catchAfterThen;
+
 var voidPromise = new Promise<void>(function (resolve) { resolve(); });
 
 //catch test
@@ -161,31 +164,31 @@ getJSON('story.json').then(function(story: Story) {
   (<HTMLElement>document.querySelector('.spinner')).style.display = 'none';
 });
 
-interface T1 {
-    __t1: string;
-}
-
-interface T2 {
-    __t2: string;
-}
-
-interface T3 {
-    __t3: string;
-}
-
-function f1(): Promise<T1> {
-    return Promise.resolve({ __t1: "foo_t1" });
-}
-
-function f2(x: T1): T2 {
-    return { __t2: x.__t1 + ":foo_21" };
-}
-
-var x3 = f1()
-    .then(f2, (e: Error) => {
-    console.log("error 1");
-    throw e;
-})
-    .then((x: T2) => {
-    return { __t3: x.__t2 + "bar" };
+interface T1 {
+    __t1: string;
+}
+
+interface T2 {
+    __t2: string;
+}
+
+interface T3 {
+    __t3: string;
+}
+
+function f1(): Promise<T1> {
+    return Promise.resolve({ __t1: "foo_t1" });
+}
+
+function f2(x: T1): T2 {
+    return { __t2: x.__t1 + ":foo_21" };
+}
+
+var x3 = f1()
+    .then(f2, (e: Error) => {
+    console.log("error 1");
+    throw e;
+})
+    .then((x: T2) => {
+    return { __t3: x.__t2 + "bar" };
 });

es6-promise/es6-promise.d.ts

@@ -6,6 +6,7 @@
 interface Thenable<R> {
     then<U>(onFulfilled?: (value: R) => U | Thenable<U>, onRejected?: (error: any) => U | Thenable<U>): Thenable<U>;
     then<U>(onFulfilled?: (value: R) => U | Thenable<U>, onRejected?: (error: any) => void): Thenable<U>;
+    catch<U>(onRejected?: (error: any) => U | Thenable<U>): Thenable<U>;
 }
 
 declare class Promise<R> implements Thenable<R> {