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feat: use queueMicrotask for nextTick timerFunc #10865

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feat: use queueMicrotask for nextTick timerFunc #10865

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504e745
feat: use queueMicrotask for nextTick timerFunc
HOUCe Nov 26, 2019
e31f775
feat: use queueMicrotask for nextTick timerFunc
HOUCe Dec 5, 2019
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12 changes: 9 additions & 3 deletions src/core/util/next-tick.js
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Original file line number Diff line number Diff line change
Expand Up @@ -33,13 +33,19 @@ function flushCallbacks () {
let timerFunc

// The nextTick behavior leverages the microtask queue, which can be accessed
// via either native Promise.then or MutationObserver.
// via native WindowOrWorkerGlobalScope.queueMicrotask, Promise.then or MutationObserver.
// MutationObserver has wider support, however it is seriously bugged in
// UIWebView in iOS >= 9.3.3 when triggered in touch event handlers. It
// completely stops working after triggering a few times... so, if native
// Promise is available, we will use it:
// WindowOrWorkerGlobalScope.queueMicrotask or Promise is available, we will use native support by priority:
/* istanbul ignore next, $flow-disable-line */
if (typeof Promise !== 'undefined' && isNative(Promise)) {
if (typeof queueMicrotask !== 'undefined' && isNative(queueMicrotask)) {
timerFunc = () => {
queueMicrotask(flushCallbacks)
}
isUsingMicroTask = true
}
else if (typeof Promise !== 'undefined' && isNative(Promise)) {
const p = Promise.resolve()
timerFunc = () => {
p.then(flushCallbacks)
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