@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 resolve from '@rollup/plugin-node-resolve';

export default {
  input: 'src/index.js',
  output: {
    dir: 'output',
    format: 'cjs'
  },
  plugins: [resolve()]
};

Then call rollup either via the CLI or the API.

Options

mainFields

Type: Array[String]
Default: ['module', 'main']

The fields to scan in a package.json to determine the entry point if this list contains "browser", overrides specified in "pkg.browser" will be used

module

Type: Boolean
Default: true

DEPRECATED: use "mainFields" instead Use "module" field for ES6 module if possible

jsnext

Type: Boolean
Default: false

DEPRECATED: use "mainFields" instead Use "jsnext:main" if possible, legacy field pointing to ES6 module in third-party libraries, deprecated in favor of "pkg.module", see: https://github.com/rollup/rollup/wiki/pkg.module

main

Type: Boolean
Default: true

DEPRECATED: use "mainFields" instead Use "main" field or index.js, even if it's not an ES6 module (needs to be converted from CommonJS to ES6) – see https://github.com/rollup/rollup-plugin-commonjs

browser

Type: Boolean
Default: false

Some package.json files have a "browser" field which specifies alternative files to load for people bundling for the browser. If that's you, either use this option or add "browser" to the "mainFields" option, otherwise pkg.browser will be ignored

extensions

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

Resolve extensions other than .js in the order specified.

preferBuiltins

Type: Boolean
Default: true

Whether to prefer built-in modules (e.g. fs, path) or local ones with the same names

jail

Type: String
Default: '/'

Lock the module search in this path (like a chroot). Modules defined outside this path will be marked as external.

only

Type: Array[String|RegExp]
Default: null

Example: only: ['some_module', /^@some_scope\/.*$/]

modulesOnly

Type: Boolean
Default: false

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

dedupe

Type: Array[String]
Default: []

Force resolving for these modules to root's node_modules that helps to prevent bundling the same package multiple times if package is imported from dependencies.

dedupe: [ 'react', 'react-dom' ]

customResolveOptions

Type: Boolean
Default: null

Any additional options that should be passed through to node-resolve.

customResolveOptions: {
  moduleDirectory: 'js_modules'
}

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 resolve 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: [resolve(), commonjs()]
};

Resolving Built-Ins (like fs)

This plugin won't resolve any builtins (e.g. fs). If you need to resolve builtins you can install local modules and set preferBuiltins to false, or install a plugin like rollup-plugin-node-builtins which provides stubbed versions of these methods.

If you want to silence warnings about builtins, you can add the list of builtins to the externals option; like so:

import resolve from '@rollup/plugin-node-resolve';
import builtins from 'builtin-modules'
export default ({
  input: ...,
  plugins: [resolve()],
  external: builtins,
  output: ...
})

Meta

CONTRIBUTING

LICENSE (MIT)