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227 lines
7.7 KiB
227 lines
7.7 KiB
[npm]: https://img.shields.io/npm/v/@rollup/plugin-node-resolve |
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[npm-url]: https://www.npmjs.com/package/@rollup/plugin-node-resolve |
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[size]: https://packagephobia.now.sh/badge?p=@rollup/plugin-node-resolve |
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[size-url]: https://packagephobia.now.sh/result?p=@rollup/plugin-node-resolve |
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[![npm][npm]][npm-url] |
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[![size][size]][size-url] |
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[![libera manifesto](https://img.shields.io/badge/libera-manifesto-lightgrey.svg)](https://liberamanifesto.com) |
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# @rollup/plugin-node-resolve |
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🍣 A Rollup plugin which locates modules using the [Node resolution algorithm](https://nodejs.org/api/modules.html#modules_all_together), for using third party modules in `node_modules` |
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## Requirements |
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This plugin requires an [LTS](https://github.com/nodejs/Release) Node version (v8.0.0+) and Rollup v1.20.0+. |
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## Install |
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Using npm: |
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```console |
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npm install @rollup/plugin-node-resolve --save-dev |
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``` |
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## Usage |
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Create a `rollup.config.js` [configuration file](https://www.rollupjs.org/guide/en/#configuration-files) and import the plugin: |
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```js |
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import { nodeResolve } from '@rollup/plugin-node-resolve'; |
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export default { |
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input: 'src/index.js', |
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output: { |
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dir: 'output', |
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format: 'cjs' |
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}, |
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plugins: [nodeResolve()] |
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}; |
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``` |
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Then call `rollup` either via the [CLI](https://www.rollupjs.org/guide/en/#command-line-reference) or the [API](https://www.rollupjs.org/guide/en/#javascript-api). |
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## Package entrypoints |
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This plugin supports the package entrypoints feature from node js, specified in the `exports` or `imports` field of a package. Check the [official documentation](https://nodejs.org/api/packages.html#packages_package_entry_points) 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. |
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## Options |
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### `exportConditions` |
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Type: `Array[...String]`<br> |
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Default: `[]` |
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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. |
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When using `@rollup/plugin-commonjs` v16 or higher, this plugin will use the `['default', 'module', 'require']` conditions when resolving require statements. |
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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. |
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### `browser` |
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Type: `Boolean`<br> |
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Default: `false` |
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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`. |
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> This option does not work when a package is using [package entrypoints](https://nodejs.org/api/packages.html#packages_package_entry_points) |
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### `moduleDirectories` |
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Type: `Array[...String]`<br> |
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Default: `['node_modules']` |
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One or more directories in which to recursively look for modules. |
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### `dedupe` |
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Type: `Array[...String]`<br> |
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Default: `[]` |
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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. |
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```js |
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dedupe: ['my-package', '@namespace/my-package']; |
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``` |
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This will deduplicate bare imports such as: |
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```js |
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import 'my-package'; |
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import '@namespace/my-package'; |
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``` |
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And it will deduplicate deep imports such as: |
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```js |
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import 'my-package/foo.js'; |
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import '@namespace/my-package/bar.js'; |
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``` |
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### `extensions` |
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Type: `Array[...String]`<br> |
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Default: `['.mjs', '.js', '.json', '.node']` |
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Specifies the extensions of files that the plugin will operate on. |
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### `jail` |
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Type: `String`<br> |
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Default: `'/'` |
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Locks the module search within specified path (e.g. chroot). Modules defined outside this path will be ignored by this plugin. |
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### `mainFields` |
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Type: `Array[...String]`<br> |
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Default: `['module', 'main']`<br> |
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Valid values: `['browser', 'jsnext:main', 'module', 'main']` |
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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. |
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### `preferBuiltins` |
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Type: `Boolean`<br> |
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Default: `true` (with warnings if a builtin module is used over a local version. Set to `true` to disable warning.) |
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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. |
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### `modulesOnly` |
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Type: `Boolean`<br> |
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Default: `false` |
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If `true`, inspect resolved files to assert that they are ES2015 modules. |
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### `resolveOnly` |
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Type: `Array[...String|RegExp]`<br> |
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Default: `null` |
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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._ |
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Example: `resolveOnly: ['batman', /^@batcave\/.*$/]` |
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### `rootDir` |
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Type: `String`<br> |
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Default: `process.cwd()` |
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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. |
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``` |
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// Set the root directory to be the parent folder |
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rootDir: path.join(process.cwd(), '..') |
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``` |
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## `ignoreSideEffectsForRoot` |
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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. |
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## Preserving symlinks |
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This plugin honours the rollup [`preserveSymlinks`](https://rollupjs.org/guide/en/#preservesymlinks) option. |
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## Using with @rollup/plugin-commonjs |
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Since most packages in your node_modules folder are probably legacy CommonJS rather than JavaScript modules, you may need to use [@rollup/plugin-commonjs](https://github.com/rollup/plugins/tree/master/packages/commonjs): |
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```js |
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// rollup.config.js |
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import { nodeResolve } from '@rollup/plugin-node-resolve'; |
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import commonjs from '@rollup/plugin-commonjs'; |
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export default { |
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input: 'main.js', |
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output: { |
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file: 'bundle.js', |
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format: 'iife', |
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name: 'MyModule' |
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}, |
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plugins: [nodeResolve(), commonjs()] |
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}; |
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``` |
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## Resolving Built-Ins (like `fs`) |
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By default this plugin will prefer built-ins over local modules, marking them as external. |
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See [`preferBuiltins`](#preferbuiltins). |
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To provide stubbed versions of Node built-ins, use a plugin like [rollup-plugin-node-polyfills](https://github.com/ionic-team/rollup-plugin-node-polyfills) and set `preferBuiltins` to `false`. e.g. |
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```js |
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import { nodeResolve } from '@rollup/plugin-node-resolve'; |
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import nodePolyfills from 'rollup-plugin-node-polyfills'; |
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export default ({ |
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input: ..., |
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plugins: [ |
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nodePolyfills(), |
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nodeResolve({ preferBuiltins: false }) |
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], |
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external: builtins, |
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output: ... |
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}) |
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``` |
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## Resolving require statements |
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According to [NodeJS module resolution](https://nodejs.org/api/packages.html#packages_package_entry_points) `require` statements should resolve using the `require` condition in the package exports field, while es modules should use the `import` condition. |
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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: |
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```js |
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this.resolve(importee, importer, { |
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skipSelf: true, |
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custom: { 'node-resolve': { isRequire: true } } |
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}); |
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``` |
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## Meta |
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[CONTRIBUTING](/.github/CONTRIBUTING.md) |
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[LICENSE (MIT)](/LICENSE)
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