1 files changed, 9 insertions, 9 deletions
diff --git a/cli/tsc/dts/lib.es2015.collection.d.ts b/cli/tsc/dts/lib.es2015.collection.d.ts
index b97201ae4..f94c48543 100644
--- a/cli/tsc/dts/lib.es2015.collection.d.ts
+++ b/cli/tsc/dts/lib.es2015.collection.d.ts
@@ -60,7 +60,7 @@ interface ReadonlyMap<K, V> {
     readonly size: number;
 }
 
-interface WeakMap<K extends object, V> {
+interface WeakMap<K extends WeakKey, V> {
     /**
      * Removes the specified element from the WeakMap.
      * @returns true if the element was successfully removed, or false if it was not present.
@@ -76,14 +76,14 @@ interface WeakMap<K extends object, V> {
     has(key: K): boolean;
     /**
      * Adds a new element with a specified key and value.
-     * @param key Must be an object.
+     * @param key Must be an object or symbol.
      */
     set(key: K, value: V): this;
 }
 
 interface WeakMapConstructor {
-    new <K extends object = object, V = any>(entries?: readonly (readonly [K, V])[] | null): WeakMap<K, V>;
-    readonly prototype: WeakMap<object, any>;
+    new <K extends WeakKey = WeakKey, V = any>(entries?: readonly (readonly [K, V])[] | null): WeakMap<K, V>;
+    readonly prototype: WeakMap<WeakKey, any>;
 }
 declare var WeakMap: WeakMapConstructor;
 
@@ -125,9 +125,9 @@ interface ReadonlySet<T> {
     readonly size: number;
 }
 
-interface WeakSet<T extends object> {
+interface WeakSet<T extends WeakKey> {
     /**
-     * Appends a new object to the end of the WeakSet.
+     * Appends a new value to the end of the WeakSet.
      */
     add(value: T): this;
     /**
@@ -136,13 +136,13 @@ interface WeakSet<T extends object> {
      */
     delete(value: T): boolean;
     /**
-     * @returns a boolean indicating whether an object exists in the WeakSet or not.
+     * @returns a boolean indicating whether a value exists in the WeakSet or not.
      */
     has(value: T): boolean;
 }
 
 interface WeakSetConstructor {
-    new <T extends object = object>(values?: readonly T[] | null): WeakSet<T>;
-    readonly prototype: WeakSet<object>;
+    new <T extends WeakKey = WeakKey>(values?: readonly T[] | null): WeakSet<T>;
+    readonly prototype: WeakSet<WeakKey>;
 }
 declare var WeakSet: WeakSetConstructor;