Add for-await-of, always use Symbol for iterables.

src/lib/es2015.iterable.d.ts

@@ -8,6 +8,17 @@ interface SymbolConstructor {
     readonly iterator: symbol;
 }
 
+interface IteratorResult<T> {
+    done: boolean;
+    value: T;
+}
+
+interface Iterator<T> {
+    next(value?: any): IteratorResult<T>;
+    return?(value?: any): IteratorResult<T>;
+    throw?(e?: any): IteratorResult<T>;
+}
+
 interface Iterable<T> {
     [Symbol.iterator](): Iterator<T>;
 }

src/lib/es2017.asynciterable.d.ts

@@ -1,4 +1,5 @@
 /// <reference path="lib.es2015.symbol.d.ts" />
+/// <reference path="lib.es2015.iterable.d.ts" />
 
 interface SymbolConstructor {
     /**

src/lib/es2017.d.ts

@@ -2,3 +2,4 @@
 /// <reference path="lib.es2017.object.d.ts" />
 /// <reference path="lib.es2017.sharedmemory.d.ts" />
 /// <reference path="lib.es2017.string.d.ts" />
+/// <reference path="lib.es2017.asynciterable.d.ts" />

src/lib/es5.d.ts

@@ -1338,39 +1338,6 @@ interface PromiseLike<T> {
         onrejected: (reason: any) => TResult2 | PromiseLike<TResult2>): PromiseLike<TResult1 | TResult2>;
 }
 
-interface IteratorResult<T> {
-    done: boolean;
-    value: T;
-}
-
-interface Iterator<T> {
-    next(value?: any): IteratorResult<T>;
-    return?(value?: any): IteratorResult<T>;
-    throw?(e?: any): IteratorResult<T>;
-}
-
-interface PseudoIterable<T> {
-    __iterator__(): Iterator<T>;
-}
-
-interface PseudoIterableIterator<T> extends Iterator<T> {
-    __iterator__(): PseudoIterableIterator<T>;
-}
-
-interface PseudoAsyncIterator<T> {
-    next(value?: any): PromiseLike<IteratorResult<T>>;
-    return?(value?: any): PromiseLike<IteratorResult<T>>;
-    throw?(e?: any): PromiseLike<IteratorResult<T>>;
-}
-
-interface PseudoAsyncIterable<T> {
-    __asyncIterator__(): PseudoAsyncIterator<T>;
-}
-
-interface PseudoAsyncIterableIterator<T> extends PseudoAsyncIterator<T> {
-    __asyncIterator__(): PseudoAsyncIterableIterator<T>;
-}
-
 interface ArrayLike<T> {
     readonly length: number;
     readonly [n: number]: T;

src/lib/esnext.d.ts

@@ -1,2 +1,2 @@
 /// <reference path="lib.es2017.d.ts" />
-/// <reference path="lib.esnext.asynciterable.d.ts" />
+/// <reference path="lib.es2017.asynciterable.d.ts" />