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<!doctype html> <html lang="en"> <head> <meta charset="utf-8"> <meta name="viewport" content="width=device-width"> <meta name="nodejs.org:node-version" content="v12.22.9"> <title>Modules: `module` API | Node.js v12.22.9 Documentation</title> <link rel="stylesheet" href="assets/style.css"> <link rel="stylesheet" href="assets/hljs.css"> <link rel="canonical" href="module.html"> </head> <body class="alt apidoc" id="api-section-module"> <div id="content" class="clearfix"> <div id="column2" class="interior"> <div id="intro" class="interior"> <a href="/" title="Go back to the home page"> Node.js </a> </div> <ul> <li><a class="nav-documentation" href="documentation.html">About this documentation</a></li> <li><a class="nav-synopsis" href="synopsis.html">Usage and example</a></li> </ul> <hr class="line"/> <ul> <li><a class="nav-assert" href="assert.html">Assertion testing</a></li> <li><a class="nav-async_hooks" href="async_hooks.html">Async hooks</a></li> <li><a class="nav-buffer" 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href="#module_module_syncbuiltinesmexports"><code>module.syncBuiltinESMExports()</code></a></li> </ul> </li> <li><a href="#module_source_map_v3_support">Source map v3 support</a><ul> <li><a href="#module_module_findsourcemap_path_error"><code>module.findSourceMap(path[, error])</code></a></li> <li><a href="#module_class_module_sourcemap">Class: <code>module.SourceMap</code></a><ul> <li><a href="#module_new_sourcemap_payload"><code>new SourceMap(payload)</code></a></li> <li><a href="#module_sourcemap_payload"><code>sourceMap.payload</code></a></li> <li><a href="#module_sourcemap_findentry_linenumber_columnnumber"><code>sourceMap.findEntry(lineNumber, columnNumber)</code></a></li> </ul> </li> </ul> </li> </ul> </li> </ul> </div> <div id="apicontent"> <h1>Modules: <code>module</code> API<span><a class="mark" href="#module_modules_module_api" id="module_modules_module_api">#</a></span></h1> <!--introduced_in=v0.3.7--> <h2>The <code>Module</code> object<span><a class="mark" href="#module_the_module_object" id="module_the_module_object">#</a></span></h2> <ul> <li>{Object}</li> </ul> <p>Provides general utility methods when interacting with instances of <code>Module</code>, the <a href="modules.html#modules_the_module_object"><code>module</code></a> variable often seen in <a href="modules.html">CommonJS</a> modules. Accessed via <code>import 'module'</code> or <code>require('module')</code>.</p> <h3><code>module.builtinModules</code><span><a class="mark" href="#module_module_builtinmodules" id="module_module_builtinmodules">#</a></span></h3> <div class="api_metadata"> <span>Added in: v9.3.0, v8.10.0, v6.13.0</span> </div><ul> <li>{string[]}</li> </ul> <p>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.</p> <p><code>module</code> in this context isn't the same object that's provided by the <a href="modules_cjs.html#modules_cjs_the_module_wrapper">module wrapper</a>. To access it, require the <code>Module</code> module:</p> <pre><code class="language-js">// module.mjs // In an ECMAScript module import { builtinModules as builtin } from 'module'; </code></pre> <pre><code class="language-js">// module.cjs // In a CommonJS module const builtin = require('module').builtinModules; </code></pre> <h3><code>module.createRequire(filename)</code><span><a class="mark" href="#module_module_createrequire_filename" id="module_module_createrequire_filename">#</a></span></h3> <div class="api_metadata"> <span>Added in: v12.2.0</span> </div><ul> <li><code>filename</code> {string|URL} Filename to be used to construct the require function. Must be a file URL object, file URL string, or absolute path string.</li> <li>Returns: {require} Require function</li> </ul> <pre><code class="language-js">import { createRequire } from 'module'; const require = createRequire(import.meta.url); // sibling-module.js is a CommonJS module. const siblingModule = require('./sibling-module'); </code></pre> <h3><code>module.createRequireFromPath(filename)</code><span><a class="mark" href="#module_module_createrequirefrompath_filename" id="module_module_createrequirefrompath_filename">#</a></span></h3> <div class="api_metadata"> <span>Added in: v10.12.0</span><span>Deprecated since: v12.2.0</span> </div><blockquote> <p>Stability: 0 - Deprecated: Please use <a href="#module_module_createrequire_filename"><code>createRequire()</code></a> instead.</p> </blockquote> <ul> <li><code>filename</code> {string} Filename to be used to construct the relative require function.</li> <li>Returns: {require} Require function</li> </ul> <pre><code class="language-js">const { createRequireFromPath } = require('module'); const requireUtil = createRequireFromPath('../src/utils/'); // Require `../src/utils/some-tool` requireUtil('./some-tool'); </code></pre> <h3><code>module.syncBuiltinESMExports()</code><span><a class="mark" href="#module_module_syncbuiltinesmexports" id="module_module_syncbuiltinesmexports">#</a></span></h3> <div class="api_metadata"> <span>Added in: v12.12.0</span> </div><p>The <code>module.syncBuiltinESMExports()</code> method updates all the live bindings for builtin <a href="esm.html">ES Modules</a> to match the properties of the <a href="modules.html">CommonJS</a> exports. It does not add or remove exported names from the <a href="esm.html">ES Modules</a>.</p> <pre><code class="language-js">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); }); </code></pre> <h2>Source map v3 support<span><a class="mark" href="#module_source_map_v3_support" id="module_source_map_v3_support">#</a></span></h2> <div class="api_metadata"> <span>Added in: v13.7.0, v12.17.0</span> </div><blockquote> <p>Stability: 1 - Experimental</p> </blockquote> <p>Helpers for interacting with the source map cache. This cache is populated when source map parsing is enabled and <a href="https://sourcemaps.info/spec.html#h.lmz475t4mvbx">source map include directives</a> are found in a modules' footer.</p> <p>To enable source map parsing, Node.js must be run with the flag <a href="cli.html#cli_enable_source_maps"><code>--enable-source-maps</code></a>, or with code coverage enabled by setting <a href="cli.html#cli_node_v8_coverage_dir"><code>NODE_V8_COVERAGE=dir</code></a>.</p> <pre><code class="language-js">// module.mjs // In an ECMAScript module import { findSourceMap, SourceMap } from 'module'; </code></pre> <pre><code class="language-js">// module.cjs // In a CommonJS module const { findSourceMap, SourceMap } = require('module'); </code></pre> <h3><code>module.findSourceMap(path[, error])</code><span><a class="mark" href="#module_module_findsourcemap_path_error" id="module_module_findsourcemap_path_error">#</a></span></h3> <div class="api_metadata"> <span>Added in: v13.7.0, v12.17.0</span> </div><ul> <li><code>path</code> {string}</li> <li><code>error</code> {Error}</li> <li>Returns: {module.SourceMap}</li> </ul> <p><code>path</code> is the resolved path for the file for which a corresponding source map should be fetched.</p> <p>The <code>error</code> instance should be passed as the second parameter to <code>findSourceMap</code> in exceptional flows, such as when an overridden <a href="https://v8.dev/docs/stack-trace-api#customizing-stack-traces"><code>Error.prepareStackTrace(error, trace)</code></a> is invoked. Modules are not added to the module cache until they are successfully loaded. In these cases, source maps are associated with the <code>error</code> instance along with the <code>path</code>.</p> <h3>Class: <code>module.SourceMap</code><span><a class="mark" href="#module_class_module_sourcemap" id="module_class_module_sourcemap">#</a></span></h3> <div class="api_metadata"> <span>Added in: v13.7.0, v12.17.0</span> </div><h4><code>new SourceMap(payload)</code><span><a class="mark" href="#module_new_sourcemap_payload" id="module_new_sourcemap_payload">#</a></span></h4> <ul> <li><code>payload</code> {Object}</li> </ul> <p>Creates a new <code>sourceMap</code> instance.</p> <p><code>payload</code> is an object with keys matching the <a href="https://sourcemaps.info/spec.html#h.mofvlxcwqzej">Source map v3 format</a>:</p> <ul> <li><code>file</code>: {string}</li> <li><code>version</code>: {number}</li> <li><code>sources</code>: {string[]}</li> <li><code>sourcesContent</code>: {string[]}</li> <li><code>names</code>: {string[]}</li> <li><code>mappings</code>: {string}</li> <li><code>sourceRoot</code>: {string}</li> </ul> <h4><code>sourceMap.payload</code><span><a class="mark" href="#module_sourcemap_payload" id="module_sourcemap_payload">#</a></span></h4> <ul> <li>Returns: {Object}</li> </ul> <p>Getter for the payload used to construct the <a href="#module_class_module_sourcemap"><code>SourceMap</code></a> instance.</p> <h4><code>sourceMap.findEntry(lineNumber, columnNumber)</code><span><a class="mark" href="#module_sourcemap_findentry_linenumber_columnnumber" id="module_sourcemap_findentry_linenumber_columnnumber">#</a></span></h4> <ul> <li><code>lineNumber</code> {number}</li> <li><code>columnNumber</code> {number}</li> <li>Returns: {Object}</li> </ul> <p>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:</p> <ul> <li>generatedLine: {number}</li> <li>generatedColumn: {number}</li> <li>originalSource: {string}</li> <li>originalLine: {number}</li> <li>originalColumn: {number}</li> </ul> <!-- API END --> </div> </div> </div> </body> </html>