From f30328e40c92e84e9a14e0b49872c19de507d681 Mon Sep 17 00:00:00 2001
From: Yanzhen Yu <yanzhen@smartx.com>
Date: Sun, 24 Nov 2019 22:33:45 +0800
Subject: [PATCH] close #143 tweak the code of iterating iterators Originally
 we use Array.from to transform iterator into array. But we found some
 framework may overwrite the Array.from with a pollyfill which was not
 implement correctly.

---
 src/record/observer.ts | 9 ++++++---
 tsconfig.json          | 3 ++-
 2 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/src/record/observer.ts b/src/record/observer.ts
index 3d6642cb..4a426519 100644
--- a/src/record/observer.ts
+++ b/src/record/observer.ts
@@ -211,11 +211,11 @@ function initMutationObserver(
       });
     };
 
-    for (var it = movedSet.values(), n = null; (n = it.next().value); ) {
+    for (const n of movedSet) {
       pushAdd(n);
     }
 
-    for (var it = addedSet.values(), n = null; (n = it.next().value); ) {
+    for (const n of addedSet) {
       if (!isAncestorInSet(droppedSet, n) && !isParentRemoved(removes, n)) {
         pushAdd(n);
       } else if (isAncestorInSet(movedSet, n)) {
@@ -281,7 +281,10 @@ function initMutationObserver(
   return observer;
 }
 
-function initMoveObserver(cb: mousemoveCallBack, mousemoveWait: number): listenerHandler {
+function initMoveObserver(
+  cb: mousemoveCallBack,
+  mousemoveWait: number,
+): listenerHandler {
   let positions: mousePosition[] = [];
   let timeBaseline: number | null;
   const wrappedCb = throttle((isTouch: boolean) => {
diff --git a/tsconfig.json b/tsconfig.json
index d58ee546..32281a27 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -8,7 +8,8 @@
     "sourceMap": true,
     "rootDir": "src",
     "outDir": "build",
-    "lib": ["es6", "dom"]
+    "lib": ["es6", "dom"],
+    "downlevelIteration": true
   },
   "compileOnSave": true,
   "exclude": ["test"],