lodash: added _.isWeakMap

lodash/lodash-tests.ts

@@ -7170,6 +7170,37 @@ module TestIsUndefined {
     }
 }
 
+// _.isWeakMap
+module TestIsWeakMap {
+    {
+        let value: number|WeakMap<string, number>;
+
+        if (_.isWeakMap<string, number>(value)) {
+            let result: WeakMap<string, number> = value;
+        }
+        else {
+            let result: number = value;
+        }
+    }
+
+    {
+        let result: boolean;
+
+        result = _.isWeakMap(any);
+        result = _(1).isWeakMap();
+        result = _<any>([]).isWeakMap();
+        result = _({}).isWeakMap();
+    }
+
+    {
+        let result: _.LoDashExplicitWrapper<boolean>;
+
+        result = _(1).chain().isWeakMap();
+        result = _<any>([]).chain().isWeakMap();
+        result = _({}).chain().isWeakMap();
+    }
+}
+
 // _.lt
 module TestLt {
     {

lodash/lodash.d.ts

@@ -12267,6 +12267,31 @@ declare module _ {
         isUndefined(): LoDashExplicitWrapper<boolean>;
     }
 
+    //_.isWeakMap
+    interface LoDashStatic {
+        /**
+         * Checks if value is classified as a WeakMap object.
+         *
+         * @param value The value to check.
+         * @returns Returns true if value is correctly classified, else false.
+         */
+        isWeakMap<K, V>(value?: any): value is WeakMap<K, V>;
+    }
+
+    interface LoDashImplicitWrapperBase<T, TWrapper> {
+        /**
+         * @see _.isSet
+         */
+        isWeakMap(): boolean;
+    }
+
+    interface LoDashExplicitWrapperBase<T, TWrapper> {
+        /**
+         * @see _.isSet
+         */
+        isWeakMap(): LoDashExplicitWrapper<boolean>;
+    }
+
     //_.lt
     interface LoDashStatic {
         /**
@@ -18487,3 +18512,4 @@ declare module "lodash" {
 // Backward compatibility with --target es5
 interface Set<T> {}
 interface Map<K, V> {}
+interface WeakMap<K, V> {}