fix: ref should support copy (#451)

Author: zombieJ

src/utils/set.ts

@@ -71,9 +71,9 @@ export function merge<T extends object>(...sources: T[]) {
   let clone = createEmpty(sources[0]);
 
   sources.forEach(src => {
-    const loopSet = new Set<object>();
+    function internalMerge(path: Path, parentLoopSet?: Set<object>) {
+      const loopSet = new Set(parentLoopSet);
 
-    function internalMerge(path: Path) {
       const value = get(src, path);
 
       const isArr = Array.isArray(value);
@@ -94,7 +94,7 @@ export function merge<T extends object>(...sources: T[]) {
           }
 
           Object.keys(value).forEach(key => {
-            internalMerge([...path, key]);
+            internalMerge([...path, key], loopSet);
           });
         }
       } else {

tests/utils.test.js

@@ -225,6 +225,17 @@ describe('utils', () => {
 
         expect(merged.user).toBe(user);
       });
+
+      it('ref object', () => {
+        const obj = { bamboo: 1 };
+
+        const merged = merge({}, { a: obj, b: obj }, {});
+
+        expect(merged).toEqual({
+          a: obj,
+          b: obj,
+        });
+      });
     });
   });