Add a non-generic construct signature to Map, Set, and WeakMap

Author: mhegazy

src/lib/es6.d.ts

@@ -694,6 +694,7 @@ interface Map<K, V> {
 }
 
 interface MapConstructor {
+    new (): Map<any, any>;
     new <K, V>(): Map<K, V>;
     new <K, V>(iterable: Iterable<[K, V]>): Map<K, V>;
     prototype: Map<any, any>;
@@ -710,6 +711,7 @@ interface WeakMap<K, V> {
 }
 
 interface WeakMapConstructor {
+    new (): WeakMap<any, any>;
     new <K, V>(): WeakMap<K, V>;
     new <K, V>(iterable: Iterable<[K, V]>): WeakMap<K, V>;
     prototype: WeakMap<any, any>;
@@ -731,6 +733,7 @@ interface Set<T> {
 }
 
 interface SetConstructor {
+    new (): Set<any>;
     new <T>(): Set<T>;
     new <T>(iterable: Iterable<T>): Set<T>;
     prototype: Set<any>;
@@ -746,6 +749,7 @@ interface WeakSet<T> {
 }
 
 interface WeakSetConstructor {
+    new (): WeakSet<any>;
     new <T>(): WeakSet<T>;
     new <T>(iterable: Iterable<T>): WeakSet<T>;
     prototype: WeakSet<any>;