sindresorhus/eslint-plugin-unicorn

Rule proposal: `prefer-queue-microtask`

クローズ

#1,346 opened on 2021/06/08

 (10 件のコメント) (3 件のリアクション) (0 人の担当者)JavaScript (468 件のフォーク)user submission
help wantednew rule

Repository metrics

Stars
 (5,022 個のスター)
PR merge metrics
 (平均マージ 4h 30m) (30d で 26 merged PRs)

説明

queueMicrotask() serves a similar purpose to process.nextTick() with the additional advantage that queueMicrotask() is specified in the WHATWG HTML Living Standard and supported on both modern browsers and Node.js (v11.0.0 and later).

When to use queueMicrotask() vs. process.nextTick() in the Node.js API documentation states:

For most userland use cases, the queueMicrotask() API provides a portable and reliable mechanism for deferring execution that works across multiple JavaScript platform environments and should be favored over process.nextTick(). In simple scenarios, queueMicrotask() can be a drop-in replacement for process.nextTick().

I propose adding a rule to warn when process.nextTick is used, and suggest queueMicrotask() as an alternative.

Fail

process.nextTick(() => process.exit(0));
process.nextTick(process.exit);
process.nextTick(process.exit, 1);
const fun = process.nextTick;
fun(process.nextTick);

Pass

queueMicrotask(() => process.exit(0));
queueMicrotask(process.exit);
// Note: queueMicrotask takes exactly 1 arg.
// Fail example fixed using .bind().
queueMicrotask(process.exit.bind(undefined, 1));
// Not sure if this should be auto-fixed.
// fun may be called with multiple args.
const fun = queueMicrotask;
// Not sure if this should be auto-fixed.
// fun may call its argument with multiple args.
fun(process.nextTick);

コントリビューターガイド