fix: Patch tslib_1__default regression and add additional test (#1896)

Author: kamilogorek

packages/browser/test/manual/npm-build.js

@@ -44,6 +44,12 @@ function runTests() {
   };
 
   const myLibrary = fs.readFileSync(bundlePath, { encoding: 'utf-8' });
+
+  if (myLibrary.indexOf('tslib_1__default') !== -1) {
+    console.log('"tslib_1__default" reappeared...');
+    process.exit(1);
+  }
+
   const scriptEl = window.document.createElement('script');
   scriptEl.textContent = myLibrary;
   window.document.body.appendChild(scriptEl);

packages/utils/src/memo.ts

@@ -26,7 +26,8 @@ export class Memo {
       this.inner.add(obj);
       return false;
     } else {
-      for (const value of this.inner) {
+      for (let i = 0; i < this.inner.length; i++) {
+        const value = this.inner[i];
         if (value === obj) {
           return true;
         }

packages/utils/src/object.ts

@@ -327,7 +327,7 @@ function normalizeValue(value: any, key?: any): any {
  */
 export function decycle(obj: any, memo: Memo = new Memo()): any {
   // tslint:disable-next-line:no-unsafe-any
-  const copy = isArray(obj) ? [...obj] : isPlainObject(obj) ? { ...obj } : obj;
+  const copy = isArray(obj) ? obj.slice() : isPlainObject(obj) ? assign({}, obj) : obj;
 
   if (!isPrimitive(obj)) {
     if (memo.memoize(obj)) {