102 lines
2.9 KiB
JavaScript
102 lines
2.9 KiB
JavaScript
getJasmineRequireObj().clearStack = function(j$) {
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const maxInlineCallCount = 10;
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function browserQueueMicrotaskImpl(global) {
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const { setTimeout, queueMicrotask } = global;
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let currentCallCount = 0;
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return function clearStack(fn) {
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currentCallCount++;
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if (currentCallCount < maxInlineCallCount) {
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queueMicrotask(fn);
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} else {
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currentCallCount = 0;
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setTimeout(fn);
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}
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};
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}
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function nodeQueueMicrotaskImpl(global) {
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const { queueMicrotask } = global;
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return function(fn) {
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queueMicrotask(fn);
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};
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}
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function messageChannelImpl(global) {
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const { MessageChannel, setTimeout } = global;
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const channel = new MessageChannel();
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let head = {};
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let tail = head;
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let taskRunning = false;
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channel.port1.onmessage = function() {
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head = head.next;
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const task = head.task;
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delete head.task;
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if (taskRunning) {
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setTimeout(task, 0);
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} else {
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try {
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taskRunning = true;
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task();
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} finally {
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taskRunning = false;
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}
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}
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};
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let currentCallCount = 0;
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return function clearStack(fn) {
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currentCallCount++;
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if (currentCallCount < maxInlineCallCount) {
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tail = tail.next = { task: fn };
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channel.port2.postMessage(0);
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} else {
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currentCallCount = 0;
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setTimeout(fn);
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}
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};
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}
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function getClearStack(global) {
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const NODE_JS =
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global.process &&
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global.process.versions &&
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typeof global.process.versions.node === 'string';
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// Windows builds of WebKit have a fairly generic user agent string when no application name is provided:
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// e.g. "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/605.1.15 (KHTML, like Gecko)"
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const SAFARI_OR_WIN_WEBKIT =
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global.navigator &&
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/(^((?!chrome|android).)*safari)|(Win64; x64\) AppleWebKit\/[0-9.]+ \(KHTML, like Gecko\)$)/i.test(
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global.navigator.userAgent
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);
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if (NODE_JS) {
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// Unlike browsers, Node doesn't require us to do a periodic setTimeout
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// so we avoid the overhead.
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return nodeQueueMicrotaskImpl(global);
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} else if (
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SAFARI_OR_WIN_WEBKIT ||
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j$.util.isUndefined(global.MessageChannel) /* tests */
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) {
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// queueMicrotask is dramatically faster than MessageChannel in Safari
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// and other WebKit-based browsers, such as the one distributed by Playwright
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// to test Safari-like behavior on Windows.
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// Some of our own integration tests provide a mock queueMicrotask in all
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// environments because it's simpler to mock than MessageChannel.
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return browserQueueMicrotaskImpl(global);
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} else {
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// MessageChannel is faster than queueMicrotask in supported browsers
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// other than Safari.
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return messageChannelImpl(global);
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}
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}
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return getClearStack;
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};
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