November: Procrastination Month

    @rollup/plugin-node-resolve
    TypeScript icon, indicating that this package has built-in type declarations

    13.0.4 • Public • Published

    npm size libera manifesto

    @rollup/plugin-node-resolve

    🍣 A Rollup plugin which locates modules using the Node resolution algorithm, for using third party modules in node_modules

    Requirements

    This plugin requires an LTS Node version (v8.0.0+) and Rollup v1.20.0+.

    Install

    Using npm:

    npm install @rollup/plugin-node-resolve --save-dev

    Usage

    Create a rollup.config.js configuration file and import the plugin:

    import { nodeResolve } from '@rollup/plugin-node-resolve';
    
    export default {
      input: 'src/index.js',
      output: {
        dir: 'output',
        format: 'cjs'
      },
      plugins: [nodeResolve()]
    };

    Then call rollup either via the CLI or the API.

    Package entrypoints

    This plugin supports the package entrypoints feature from node js, specified in the exports or imports field of a package. Check the official documentation for more information on how this works. This is the default behavior. In the abscence of these fields, the fields in mainFields will be the ones to be used.

    Options

    exportConditions

    Type: Array[...String]
    Default: []

    Additional conditions of the package.json exports field to match when resolving modules. By default, this plugin looks for the ['default', 'module', 'import'] conditions when resolving imports.

    When using @rollup/plugin-commonjs v16 or higher, this plugin will use the ['default', 'module', 'require'] conditions when resolving require statements.

    Setting this option will add extra conditions on top of the default conditions. See https://nodejs.org/api/packages.html#packages_conditional_exports for more information.

    In order to get the resolution behavior of Node.js, set this to ['node'].

    browser

    Type: Boolean
    Default: false

    If true, instructs the plugin to use the browser module resolutions in package.json and adds 'browser' to exportConditions if it is not present so browser conditionals in exports are applied. If false, any browser properties in package files will be ignored. Alternatively, a value of 'browser' can be added to both the mainFields and exportConditions options, however this option takes precedence over mainFields.

    This option does not work when a package is using package entrypoints

    moduleDirectories

    Type: Array[...String]
    Default: ['node_modules']

    One or more directories in which to recursively look for modules.

    dedupe

    Type: Array[...String]
    Default: []

    An Array of modules names, which instructs the plugin to force resolving for the specified modules to the root node_modules. Helps to prevent bundling the same package multiple times if package is imported from dependencies.

    dedupe: ['my-package', '@namespace/my-package'];

    This will deduplicate bare imports such as:

    import 'my-package';
    import '@namespace/my-package';

    And it will deduplicate deep imports such as:

    import 'my-package/foo.js';
    import '@namespace/my-package/bar.js';

    extensions

    Type: Array[...String]
    Default: ['.mjs', '.js', '.json', '.node']

    Specifies the extensions of files that the plugin will operate on.

    jail

    Type: String
    Default: '/'

    Locks the module search within specified path (e.g. chroot). Modules defined outside this path will be ignored by this plugin.

    mainFields

    Type: Array[...String]
    Default: ['module', 'main']
    Valid values: ['browser', 'jsnext:main', 'module', 'main']

    Specifies the properties to scan within a package.json, used to determine the bundle entry point. The order of property names is significant, as the first-found property is used as the resolved entry point. If the array contains 'browser', key/values specified in the package.json browser property will be used.

    preferBuiltins

    Type: Boolean
    Default: true (with warnings if a builtin module is used over a local version. Set to true to disable warning.)

    If true, the plugin will prefer built-in modules (e.g. fs, path). If false, the plugin will look for locally installed modules of the same name.

    modulesOnly

    Type: Boolean
    Default: false

    If true, inspect resolved files to assert that they are ES2015 modules.

    resolveOnly

    Type: Array[...String|RegExp]
    Default: null

    An Array which instructs the plugin to limit module resolution to those whose names match patterns in the array. Note: Modules not matching any patterns will be marked as external.

    Example: resolveOnly: ['batman', /^@batcave\/.*$/]

    rootDir

    Type: String
    Default: process.cwd()

    Specifies the root directory from which to resolve modules. Typically used when resolving entry-point imports, and when resolving deduplicated modules. Useful when executing rollup in a package of a mono-repository.

    // Set the root directory to be the parent folder
    rootDir: path.join(process.cwd(), '..')
    

    ignoreSideEffectsForRoot

    If you use the sideEffects property in the package.json, by default this is respected for files in the root package. Set to true to ignore the sideEffects configuration for the root package.

    Preserving symlinks

    This plugin honours the rollup preserveSymlinks option.

    Using with @rollup/plugin-commonjs

    Since most packages in your node_modules folder are probably legacy CommonJS rather than JavaScript modules, you may need to use @rollup/plugin-commonjs:

    // rollup.config.js
    import { nodeResolve } from '@rollup/plugin-node-resolve';
    import commonjs from '@rollup/plugin-commonjs';
    
    export default {
      input: 'main.js',
      output: {
        file: 'bundle.js',
        format: 'iife',
        name: 'MyModule'
      },
      plugins: [nodeResolve(), commonjs()]
    };

    Resolving Built-Ins (like fs)

    By default this plugin will prefer built-ins over local modules, marking them as external.

    See preferBuiltins.

    To provide stubbed versions of Node built-ins, use a plugin like rollup-plugin-node-polyfills and set preferBuiltins to false. e.g.

    import { nodeResolve } from '@rollup/plugin-node-resolve';
    import nodePolyfills from 'rollup-plugin-node-polyfills';
    export default ({
      input: ...,
      plugins: [
        nodePolyfills(),
        nodeResolve({ preferBuiltins: false })
      ],
      external: builtins,
      output: ...
    })

    Resolving require statements

    According to NodeJS module resolution require statements should resolve using the require condition in the package exports field, while es modules should use the import condition.

    The node resolve plugin uses import by default, you can opt into using the require semantics by passing an extra option to the resolve function:

    this.resolve(importee, importer, {
      skipSelf: true,
      custom: { 'node-resolve': { isRequire: true } }
    });

    Meta

    CONTRIBUTING

    LICENSE (MIT)

    Install

    npm i @rollup/plugin-node-resolve@13.0.4

    Version

    13.0.4

    License

    MIT

    Unpacked Size

    92.1 kB

    Total Files

    8

    Last publish

    Collaborators

    • shellscape
    • rich_harris
    • guybedford
    • lukastaegert