🐛 identify host app dynamic creation (#897)

examples/react16/src/components/HelloModal.js

@@ -1,24 +1,8 @@
 import React, { useState, useEffect } from 'react';
 import { Button, Modal } from 'antd';
 
-const dispatchUIEvent = () => {
-  const $a = document.createElement('a');
-  $a.onclick = () => {
-    console.log('log from UIEvent');
-  };
-  const evt = new MouseEvent('click', {
-    view: window,
-    bubbles: true,
-    cancelable: false,
-  });
-  $a.dispatchEvent(evt);
-};
-
 export default function() {
   const [visible, setVisible] = useState(false);
-  useEffect(() => {
-    dispatchUIEvent();
-  }, []);
   return (
     <>
       <Button onClick={() => setVisible(true)}>CLICK ME</Button>

src/sandbox/__tests__/proxySandbox.test.ts

@@ -195,8 +195,8 @@ test('hasOwnProperty should always returns same reference', () => {
 });
 
 test('document accessing should modify the attachDocProxySymbol value every time', () => {
-  const proxy1 = new ProxySandbox('doc-access-test1').proxy as any;
+  const proxy1 = new ProxySandbox('doc-access-test1').proxy;
-  const proxy2 = new ProxySandbox('doc-access-test2').proxy as any;
+  const proxy2 = new ProxySandbox('doc-access-test2').proxy;
 
   const d1 = proxy1.document;
   expect(d1[attachDocProxySymbol]).toBe(proxy1);
@@ -207,6 +207,37 @@ test('document accessing should modify the attachDocProxySymbol value every time
   expect(d1).toBe(document);
 });
 
+test('document attachDocProxySymbol mark should be remove before next tasl', done => {
+  const { proxy } = new ProxySandbox('doc-symbol');
+  const d1 = proxy.document;
+  expect(d1[attachDocProxySymbol]).toBe(proxy);
+
+  setTimeout(() => {
+    expect(d1[attachDocProxySymbol]).toBeUndefined();
+    done();
+  });
+});
+
+test('document should work well with MutationObserver', done => {
+  const docProxy = new ProxySandbox('doc').proxy;
+
+  const observer = new MutationObserver(mutations => {
+    if (mutations[0]) {
+      expect(mutations[0].target).toBe(document.body);
+      observer.disconnect();
+      done();
+    }
+  });
+
+  observer.observe(docProxy.document, {
+    attributes: true,
+    subtree: true,
+    childList: true,
+  });
+
+  docProxy.document.body.innerHTML = '<div></div>';
+});
+
 test('bounded function should not be rebounded', () => {
   const proxy = new ProxySandbox('bound-fn-test').proxy as any;
   const fn = () => {};

src/sandbox/proxySandbox.ts

@@ -4,7 +4,7 @@
  * @since 2020-3-31
  */
 import { SandBox, SandBoxType } from '../interfaces';
-import { uniq } from '../utils';
+import { nextTick, uniq } from '../utils';
 import { attachDocProxySymbol, getTargetValue } from './common';
 import { clearSystemJsProps, interceptSystemJsProps } from './noise/systemjs';
 
@@ -186,6 +186,10 @@ export default class ProxySandbox implements SandBox {
         // mark the symbol to document while accessing as document.createElement could know is invoked by which sandbox for dynamic append patcher
         if (p === 'document') {
           document[attachDocProxySymbol] = proxy;
+          // remove the mark in next tick, thus we can identify whether it in micro app or not
+          // this approach is just a workaround, it could not cover all the complex scenarios, such as the micro app runs in the same task context with master in som case
+          // fixme if you have any other good ideas
+          nextTick(() => delete document[attachDocProxySymbol]);
           return document;
         }
 

src/utils.ts

@@ -14,6 +14,14 @@ export function sleep(ms: number) {
   return new Promise(resolve => setTimeout(resolve, ms));
 }
 
+/**
+ * run a callback after next tick
+ * @param cb
+ */
+export function nextTick(cb: () => void): void {
+  Promise.resolve().then(cb);
+}
+
 export function isConstructable(fn: () => void | FunctionConstructor) {
   const constructableFunctionRegex = /^function\b\s[A-Z].*/;
   const classRegex = /^class\b/;