worker_threads.isInternalThread

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Type:boolean

Is true if this code is running inside of an internal Worker thread (e.g the loader thread).

node --experimental-loader ./loader.js main.js

// loader.js
import { isInternalThread } from 'node:worker_threads';
console.log(isInternalThread);  // true

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// loader.js
const { isInternalThread } = require('node:worker_threads');
console.log(isInternalThread);  // true

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// main.js
import { isInternalThread } from 'node:worker_threads';
console.log(isInternalThread);  // false

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// main.js
const { isInternalThread } = require('node:worker_threads');
console.log(isInternalThread);  // false

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