Node.js process.nextTick All In One

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Node.js process.nextTick All In One

The Node.js Event Loop, Timers, and process.nextTick()

// process.nextTick

https://nodejs.org/en/docs/guides/event-loop-timers-and-nexttick/

https://nodejs.org/zh-cn/docs/guides/event-loop-timers-and-nexttick/

`process.nextTick` vs `setImmediate`

const baz = () => console.log('baz');
const foo = () => console.log('foo');
const zoo = () => console.log('zoo');

const start = () => {
  console.log('start');
  setImmediate(baz);
  new Promise((resolve, reject) => {
    resolve('bar');
  }).then((resolve) => {
    console.log(resolve);
    process.nextTick(zoo);
  });
  process.nextTick(foo);
};

start();

// start foo bar zoo baz

https://nodejs.dev/en/learn/understanding-setimmediate/

https://nodejs.dev/zh-cn/learn/understanding-processnexttick/

import { nextTick } from 'node:process';

console.log('start');
nextTick(() => {
  console.log('nextTick callback');
});
console.log('scheduled');
// Output:
// start
// scheduled
// nextTick callback

https://nodejs.org/api/process.html#processnexttickcallback-args

queueMicrotask() vs. process.nextTick()

import { nextTick } from 'node:process';

Promise.resolve().then(() => console.log(2));
queueMicrotask(() => console.log(3));
nextTick(() => console.log(1));
// Output:
// 1
// 2
// 3

console.log('start');
queueMicrotask(() => {
  console.log('microtask callback');
});
console.log('scheduled');
// Output:
// start
// scheduled
// microtask callback

https://nodejs.org/api/process.html#when-to-use-queuemicrotask-vs-processnexttick

`queueMicrotask`

let id = setInterval(() => {
  console.log(`4`);
  clearInterval(id);
});

setTimeout(() => {
  console.log(`3`);
});

queueMicrotask(() => {
  console.log(`2`);
});

console.log(`1`);

/*

1
2

3
4

*/

let id = setInterval(() => {
  console.log(`5`);
  clearInterval(id);
});

setTimeout(() => {
  console.log(`4`);
});

Promise.resolve().then(() => console.log(`2`));

queueMicrotask(() => {
  console.log(`3`);
});

console.log(`1`);

/*

1
2

3
4
5

*/