diff --git a/src/lib/es2015.array.d.ts b/src/lib/es2015.array.d.ts
index 08e931433e7..1643f928637 100644
--- a/src/lib/es2015.array.d.ts
+++ b/src/lib/es2015.array.d.ts
@@ -1,37 +1,4 @@
-
 interface Array<T> {
-    /** Iterator */
-    [Symbol.iterator](): IterableIterator<T>;
-
-    /**
-     * Returns an object whose properties have the value 'true'
-     * when they will be absent when used in a 'with' statement.
-     */
-    [Symbol.unscopables](): {
-        copyWithin: boolean;
-        entries: boolean;
-        fill: boolean;
-        find: boolean;
-        findIndex: boolean;
-        keys: boolean;
-        values: boolean;
-    };
-
-    /** 
-      * Returns an array of key, value pairs for every entry in the array
-      */
-    entries(): IterableIterator<[number, T]>;
-
-    /** 
-      * Returns an list of keys in the array
-      */
-    keys(): IterableIterator<number>;
-
-    /** 
-      * Returns an list of values in the array
-      */
-    values(): IterableIterator<T>;
-
     /** 
       * Returns the value of the first element in the array where predicate is true, and undefined 
       * otherwise.
@@ -85,13 +52,6 @@ interface ArrayConstructor {
       */
     from<T, U>(arrayLike: ArrayLike<T>, mapfn: (v: T, k: number) => U, thisArg?: any): Array<U>;
 
-    /**
-      * Creates an array from an iterable object.
-      * @param iterable An iterable object to convert to an array.
-      * @param mapfn A mapping function to call on every element of the array.
-      * @param thisArg Value of 'this' used to invoke the mapfn.
-      */
-    from<T, U>(iterable: Iterable<T>, mapfn: (v: T, k: number) => U, thisArg?: any): Array<U>;
 
     /**
       * Creates an array from an array-like object.
@@ -99,12 +59,6 @@ interface ArrayConstructor {
       */
     from<T>(arrayLike: ArrayLike<T>): Array<T>;
 
-    /**
-      * Creates an array from an iterable object.
-      * @param iterable An iterable object to convert to an array.
-      */
-    from<T>(iterable: Iterable<T>): Array<T>;
-
     /**
       * Returns a new array from a set of elements.
       * @param items A set of elements to include in the new array object.
diff --git a/src/lib/es2015.collection.d.ts b/src/lib/es2015.collection.d.ts
index aabe99cc51f..81613800d50 100644
--- a/src/lib/es2015.collection.d.ts
+++ b/src/lib/es2015.collection.d.ts
@@ -31,3 +31,40 @@ interface WeakMapConstructor {
 }
 declare var WeakMap: WeakMapConstructor;
 
+interface Set<T> {
+    add(value: T): Set<T>;
+    clear(): void;
+    delete(value: T): boolean;
+    entries(): IterableIterator<[T, T]>;
+    forEach(callbackfn: (value: T, index: T, set: Set<T>) => void, thisArg?: any): void;
+    has(value: T): boolean;
+    keys(): IterableIterator<T>;
+    readonly size: number;
+    values(): IterableIterator<T>;
+    [Symbol.iterator]():IterableIterator<T>;
+    readonly [Symbol.toStringTag]: "Set";
+}
+
+interface SetConstructor {
+    new (): Set<any>;
+    new <T>(): Set<T>;
+    new <T>(iterable: Iterable<T>): Set<T>;
+    readonly prototype: Set<any>;
+}
+declare var Set: SetConstructor;
+
+interface WeakSet<T> {
+    add(value: T): WeakSet<T>;
+    clear(): void;
+    delete(value: T): boolean;
+    has(value: T): boolean;
+    readonly [Symbol.toStringTag]: "WeakSet";
+}
+
+interface WeakSetConstructor {
+    new (): WeakSet<any>;
+    new <T>(): WeakSet<T>;
+    new <T>(iterable: Iterable<T>): WeakSet<T>;
+    readonly prototype: WeakSet<any>;
+}
+declare var WeakSet: WeakSetConstructor;
diff --git a/src/lib/es5.d.ts b/src/lib/es5.d.ts
index 0dd2a5d1091..1d152f3ad56 100644
--- a/src/lib/es5.d.ts
+++ b/src/lib/es5.d.ts
@@ -4106,4 +4106,4 @@ interface Date {
       * @param options An object that contains one or more properties that specify comparison options.
       */
     toLocaleTimeString(locale?: string, options?: Intl.DateTimeFormatOptions): string;
-}
\ No newline at end of file
+}