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56 lines
1.9 KiB
TypeScript
56 lines
1.9 KiB
TypeScript
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/**
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* Copyright (c) Microsoft Corporation.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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// See https://joel.tools/microtasks/
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export function makeWaitForNextTask() {
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// As of Mar 2021, Electron v12 doesn't create new task with `setImmediate` despite
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// using Node 14 internally, so we fallback to `setTimeout(0)` instead.
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// @see https://github.com/electron/electron/issues/28261
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if ((process.versions as any).electron)
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return (callback: () => void) => setTimeout(callback, 0);
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if (parseInt(process.versions.node, 10) >= 11)
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return setImmediate;
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// Unlike Node 11, Node 10 and less have a bug with Task and MicroTask execution order:
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// - https://github.com/nodejs/node/issues/22257
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//
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// So we can't simply run setImmediate to dispatch code in a following task.
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// However, we can run setImmediate from-inside setImmediate to make sure we're getting
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// in the following task.
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let spinning = false;
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const callbacks: (() => void)[] = [];
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const loop = () => {
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const callback = callbacks.shift();
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if (!callback) {
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spinning = false;
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return;
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}
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setImmediate(loop);
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// Make sure to call callback() as the last thing since it's
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// untrusted code that might throw.
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callback();
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};
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return (callback: () => void) => {
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callbacks.push(callback);
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if (!spinning) {
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spinning = true;
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setImmediate(loop);
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}
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};
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}
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