enable intellisense for the main classes (#10618)

test/spec/util/rebind.js

@@ -0,0 +1,19 @@
+describe('utilRebind', () => {
+    it('copies methods from source to target', () => {
+        const target = { original: 123 };
+        const source = new class {
+            value = 456;
+            method() {
+                return this.value;
+            }
+        };
+
+        const copied = iD.utilRebind(target, source, 'method');
+
+        expect(copied).toStrictEqual({
+            original: 123,
+            method: expect.any(Function)
+        });
+        expect(copied.method()).toBe(456);
+    });
+});