@pi0/rollup-plugin-node-resolve v11.0.2-pre

@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.

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.

browser

Type: Boolean Default: false

If true, instructs the plugin to use the "browser" property in package.json files to specify alternative files to load for bundling. This is useful when bundling for a browser environment. Alternatively, a value of 'browser' can be added to the mainFields option. If false, any "browser" properties in package files will be ignored. 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(), '..')

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 or use builtin-modules with external, and set preferBuiltins to false. e.g.

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

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CONTRIBUTING

LICENSE (MIT)