fix(core): support Set/Map in immutable mode (#2852)

fix #2848

src/core/src/lib/utils.spec.ts

@@ -167,6 +167,17 @@ describe('clone', () => {
     expect(clone(d)).not.toBe(d);
   });
 
+  it('Map & Set', () => {
+    const set = new Set();
+    const map = new Map();
+
+    expect(set instanceof Set).toBeTruthy();
+    expect(clone(set)).not.toBe(set);
+
+    expect(map instanceof Map).toBeTruthy();
+    expect(clone(map)).not.toBe(map);
+  });
+
   it('Object with methods', () => {
     class Foo {
       constructor(public foo = '') {}

src/core/src/lib/utils.ts

@@ -155,6 +155,14 @@ export function clone(value: any): any {
     return value;
   }
 
+  if (value instanceof Set) {
+    return new Set(value);
+  }
+
+  if (value instanceof Map) {
+    return new Map(value);
+  }
+
   // https://github.com/moment/moment/blob/master/moment.js#L252
   if (value._isAMomentObject && isFunction(value.clone)) {
     return value.clone();