![libera manifesto](https://img.shields.io/badge/libera-manifesto-lightgrey.svg)
@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 (v14.0.0+) and Rollup v2.78.0+.
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']
A list of directory names in which to recursively look for modules.
modulePaths
Type: Array[...String]
Default: []
A list of absolute paths to additional locations to search for modules. This is analogous to setting the NODE_PATH
environment variable for node.
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] | (module: string) => boolean
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.
Alternatively, you may pass in a function that returns a boolean to confirm whether the module should be included or not.
Examples:
resolveOnly: ['batman', /^@batcave\/.*$/]
resolveOnly: module => !module.includes('joker')
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:
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)