Table of Contents

• Modules: module API
  • The Module object
    • module.builtinModules
    • module.createRequire(filename)
    • module.createRequireFromPath(filename)
    • module.isPreloading
    • module.syncBuiltinESMExports()
  • Source map v3 support
    • module.findSourceMap(path)
    • Class: module.SourceMap
      • new SourceMap(payload)
      • sourceMap.payload
      • sourceMap.findEntry(lineNumber, columnNumber)

Modules: module API#

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.createRequireFromPath(filename)#

• filename <string> Filename to be used to construct the relative require function.
• Returns: <require> Require function

const { createRequireFromPath } = require('module');
const requireUtil = createRequireFromPath('../src/utils/');

// Require `../src/utils/some-tool`
requireUtil('./some-tool');

module.isPreloading#

• Type: <boolean> true if the module is running during the Node.js preload phase.

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 { syncBuiltinESMExports } = require('module');

fs.readFile = null;

delete fs.readFileSync;

fs.newAPI = function newAPI() {
  // ...
};

syncBuiltinESMExports();

import('fs').then((esmFS) => {
  assert.strictEqual(esmFS.readFile, null);
  assert.strictEqual('readFileSync' in fs, true);
  assert.strictEqual(esmFS.newAPI, undefined);
});

Source map v3 support#

Helpers for interacting with the source map cache. This cache is populated when source map parsing is enabled and source map include directives are found in a modules' footer.

To enable source map parsing, Node.js must be run with the flag --enable-source-maps, or with code coverage enabled by setting NODE_V8_COVERAGE=dir.

// module.mjs
// In an ECMAScript module
import { findSourceMap, SourceMap } from 'module';

// module.cjs
// In a CommonJS module
const { findSourceMap, SourceMap } = require('module');

module.findSourceMap(path)#

• path <string>
• Returns: <module.SourceMap>

path is the resolved path for the file for which a corresponding source map should be fetched.

Class: module.SourceMap#

new SourceMap(payload)#

• payload <Object>

Creates a new sourceMap instance.

payload is an object with keys matching the Source map v3 format:

• file: <string>
• version: <number>
• sources: <string[]>
• sourcesContent: <string[]>
• names: <string[]>
• mappings: <string>
• sourceRoot: <string>

sourceMap.payload#

• Returns: <Object>

Getter for the payload used to construct the SourceMap instance.

sourceMap.findEntry(lineNumber, columnNumber)#

• lineNumber <number>
• columnNumber <number>
• Returns: <Object>

Given a line number and column number in the generated source file, returns an object representing the position in the original file. The object returned consists of the following keys:

• generatedLine: <number>
• generatedColumn: <number>
• originalSource: <string>
• originalLine: <number>
• originalColumn: <number>
• name: <string>