Node.js v17.9.1 documentation

The Module object#

• <Object>

Provides general utility methods when interacting with instances of Module, the module variable often seen in CommonJS modules. Accessed via import 'module' or require('module').

module.builtinModules#

• <string[]>

A list of the names of all modules provided by Node.js. Can be used to verify if a module is maintained by a third party or not.

module in this context isn't the same object that's provided by the module wrapper. To access it, require the Module module:

// module.mjs
// In an ECMAScript module
import { builtinModules as builtin } from 'module';// module.cjs
// In a CommonJS module
const builtin = require('module').builtinModules;

module.createRequire(filename)#

• filename <string> | <URL> Filename to be used to construct the require function. Must be a file URL object, file URL string, or absolute path string.
• Returns: <require> Require function

import { createRequire } from 'module';
const require = createRequire(import.meta.url);

// sibling-module.js is a CommonJS module.
const siblingModule = require('./sibling-module');

module.syncBuiltinESMExports()#

The module.syncBuiltinESMExports() method updates all the live bindings for builtin ES Modules to match the properties of the CommonJS exports. It does not add or remove exported names from the ES Modules.

const fs = require('fs');
const assert = require('assert');
const { syncBuiltinESMExports } = require('module');

fs.readFile = newAPI;

delete fs.readFileSync;

function newAPI() {
  // ...
}

fs.newAPI = newAPI;

syncBuiltinESMExports();

import('fs').then((esmFS