eslint-plugin-n
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Additional ESLint's rules for Node.js
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# eslint-plugin-n
> forked from [eslint-plugin-node](https://www.npmjs.com/package/eslint-plugin-node) v11.1.0. as the original repository seems [no longer maintained](https://github.com/mysticatea/eslint-plugin-node/issues/300).
[](https://www.npmjs.com/package/eslint-plugin-n)
[](https://www.npmjs.com/package/eslint-plugin-n)
[](https://github.com/eslint-community/eslint-plugin-n/actions)
Additional ESLint rules for Node.js
## šØ Playground
[online-playground](https://eslint-online-playground.netlify.app/#eNp1jzEOwjAMRa9SeWFpYS8rOwtiIQxRalWBxIniFIFQ747bCASV2BK/Lz//J3AyG7xrHx2uLwwtWB9DytXKW2ZLfVP+q60iqGGN7CzlZCQbSNJPRVWlAO8ZqWMFbXWS3xxqE5rgvcyxU1BLKrqht9TS5oec67Kj0PcO+gI6MaZ9zDYUPEtnrfH6iIkFTHMFTmfkLLZ3gsOQDB4eEUvAh25w8p74qGiUTlGbq+6n9t+NOrztME4nkrG40M79/hgLbEqbZnHXRzu+APYwfks=)
## šæ Install & Usage
```sh
npm install --save-dev eslint eslint-plugin-n
```
| Version | Supported Node.js | Supported ESLint Version | Status |
|---------|-------------------|---------------------------|--------|
| 17.x | `^18.18.0 \|\| ^20.9.0 \|\| >=21.1.0` | `>=8.23.0` | šāāļøactively maintained |
| 16.x | `>=16.0.0` | `>=7.0.0` | ā ļøEOL |
| 15.x | `>=12.22.0` | `>=7.0.0` | ā ļøEOL |
**Note:** It recommends a use of [the "engines" field of package.json](https://docs.npmjs.com/files/package.json#engines). The "engines" field is used by `n/no-unsupported-features/*` rules.
### [`eslint.config.js`](https://eslint.org/docs/latest/use/configure/configuration-files-new) (requires eslint>=v8.23.0)
```js
const nodePlugin = require("eslint-plugin-n")
module.exports = [
nodePlugin.configs["flat/recommended-script"],
{
rules: {
"n/exports-style": ["error", "module.exports"]
}
}
]
```
To setup without the recommended configs, you'll need to add the plugin:
```js
const nodePlugin = require("eslint-plugin-n")
module.exports = [
{
plugins: {n: nodePlugin},
rules: {
"n/exports-style": ["error", "module.exports"]
}
}
]
```
### **[.eslintrc.json](https://eslint.org/docs/latest/use/configure/configuration-files)** (legacy example)
```jsonc
{
"extends": ["eslint:recommended", "plugin:n/recommended"],
"parserOptions": {
"ecmaVersion": 2021
},
"rules": {
"n/exports-style": ["error", "module.exports"]
}
}
```
To setup without the recommended rules you'll need to add the plugin:
```jsonc
{
"parserOptions": {
"ecmaVersion": 2021
},
"plugins": ["n"],
"rules": {
"n/exports-style": ["error", "module.exports"]
}
}
```
**package.json** (An example)
```json
{
"name": "your-module",
"version": "1.0.0",
"type": "commonjs",
"engines": {
"node": ">=8.10.0"
}
}
```
### Configured Node.js version range
The rules get the supported Node.js version range from the following, falling back to the next if unspecified:
1. Rule configuration `version`
2. ESLint [shared setting](http://eslint.org/docs/user-guide/configuring.html#adding-shared-settings) `node.version`
3. `package.json` [`engines`] field
4. `>=16.0.0`
If you omit the [engines] field, this rule chooses `>=16.0.0` as the configured Node.js version since `16` is the maintained lts (see also [Node.js Release Working Group](https://github.com/nodejs/Release#readme)).
For Node.js packages, using the [`engines`] field is recommended because it's the official way to indicate support:
```json
{
"name": "your-module",
"version": "1.0.0",
"engines": {
"node": ">=16.0.0"
}
}
```
For [Shareable Configs](https://eslint.org/docs/latest/developer-guide/shareable-configs) or packages with a different development environment (e.g. pre-compiled, web package, etc.), you can configure ESLint with `settings.node.version` to specify support.
## š Rules
<!-- begin auto-generated rules list -->
š¼ [Configurations](https://github.com/eslint-community/eslint-plugin-n#-configs) enabled in.\
š¢ Set in the `recommended-module` [configuration](https://github.com/eslint-community/eslint-plugin-n#-configs).\
ā
Set in the `recommended-script` [configuration](https://github.com/eslint-community/eslint-plugin-n#-configs).\
š§ Automatically fixable by the [`--fix` CLI option](https://eslint.org/docs/user-guide/command-line-interface#--fix).\
ā Deprecated.
| NameĀ Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā | Description | š¼ | š§ | ā |
| :------------------------------------------------------------------------------------------- | :-------------------------------------------------------------------------- | :--- | :- | :- |
| [callback-return](docs/rules/callback-return.md) | require `return` statements after callbacks | | | |
| [exports-style](docs/rules/exports-style.md) | enforce either `module.exports` or `exports` | | š§ | |
| [file-extension-in-import](docs/rules/file-extension-in-import.md) | enforce the style of file extensions in `import` declarations | | š§ | |
| [global-require](docs/rules/global-require.md) | require `require()` calls to be placed at top-level module scope | | | |
| [handle-callback-err](docs/rules/handle-callback-err.md) | require error handling in callbacks | | | |
| [hashbang](docs/rules/hashbang.md) | require correct usage of hashbang | š¢ ā
| š§ | |
| [no-callback-literal](docs/rules/no-callback-literal.md) | enforce Node.js-style error-first callback pattern is followed | | | |
| [no-deprecated-api](docs/rules/no-deprecated-api.md) | disallow deprecated APIs | š¢ ā
| | |
| [no-exports-assign](docs/rules/no-exports-assign.md) | disallow the assignment to `exports` | š¢ ā
| | |
| [no-extraneous-import](docs/rules/no-extraneous-import.md) | disallow `import` declarations which import extraneous modules | š¢ ā
| | |
| [no-extraneous-require](docs/rules/no-extraneous-require.md) | disallow `require()` expressions which import extraneous modules | š¢ ā
| | |
| [no-hide-core-modules](docs/rules/no-hide-core-modules.md) | disallow third-party modules which are hiding core modules | | | ā |
| [no-missing-import](docs/rules/no-missing-import.md) | disallow `import` declarations which import non-existence modules | š¢ ā
| | |
| [no-missing-require](docs/rules/no-missing-require.md) | disallow `require()` expressions which import non-existence modules | š¢ ā
| | |
| [no-mixed-requires](docs/rules/no-mixed-requires.md) | disallow `require` calls to be mixed with regular variable declarations | | | |
| [no-new-require](docs/rules/no-new-require.md) | disallow `new` operators with calls to `require` | | | |
| [no-path-concat](docs/rules/no-path-concat.md) | disallow string concatenation with `__dirname` and `__filename` | | | |
| [no-process-env](docs/rules/no-process-env.md) | disallow the use of `process.env` | | | |
| [no-process-exit](docs/rules/no-process-exit.md) | disallow the use of `process.exit()` | š¢ ā
| | |
| [no-restricted-import](docs/rules/no-restricted-import.md) | disallow specified modules when loaded by `import` declarations | | | |
| [no-restricted-require](docs/rules/no-restricted-require.md) | disallow specified modules when loaded by `require` | | | |
| [no-sync](docs/rules/no-sync.md) | disallow synchronous methods | | | |
| [no-top-level-await](docs/rules/no-top-level-await.md) | disallow top-level `await` in published modules | | | |
| [no-unpublished-bin](docs/rules/no-unpublished-bin.md) | disallow `bin` files that npm ignores | š¢ ā
| | |
| [no-unpublished-import](docs/rules/no-unpublished-import.md) | disallow `import` declarations which import private modules | š¢ ā
| | |
| [no-unpublished-require](docs/rules/no-unpublished-require.md) | disallow `require()` expressions which import private modules | š¢ ā
| | |
| [no-unsupported-features/es-builtins](docs/rules/no-unsupported-features/es-builtins.md) | disallow unsupported ECMAScript built-ins on the specified version | š¢ ā
| | |
| [no-unsupported-features/es-syntax](docs/rules/no-unsupported-features/es-syntax.md) | disallow unsupported ECMAScript syntax on the specified version | š¢ ā
| | |
| [no-unsupported-features/node-builtins](docs/rules/no-unsupported-features/node-builtins.md) | disallow unsupported Node.js built-in APIs on the specified version | š¢ ā
| | |
| [prefer-global/buffer](docs/rules/prefer-global/buffer.md) | enforce either `Buffer` or `require("buffer").Buffer` | | | |
| [prefer-global/console](docs/rules/prefer-global/console.md) | enforce either `console` or `require("console")` | | | |
| [prefer-global/process](docs/rules/prefer-global/process.md) | enforce either `process` or `require("process")` | | | |
| [prefer-global/text-decoder](docs/rules/prefer-global/text-decoder.md) | enforce either `TextDecoder` or `require("util").TextDecoder` | | | |
| [prefer-global/text-encoder](docs/rules/prefer-global/text-encoder.md) | enforce either `TextEncoder` or `require("util").TextEncoder` | | | |
| [prefer-global/url](docs/rules/prefer-global/url.md) | enforce either `URL` or `require("url").URL` | | | |
| [prefer-global/url-search-params](docs/rules/prefer-global/url-search-params.md) | enforce either `URLSearchParams` or `require("url").URLSearchParams` | | | |
| [prefer-node-protocol](docs/rules/prefer-node-protocol.md) | enforce using the `node:` protocol when importing Node.js builtin modules. | | š§ | |
| [prefer-promises/dns](docs/rules/prefer-promises/dns.md) | enforce `require("dns").promises` | | | |
| [prefer-promises/fs](docs/rules/prefer-promises/fs.md) | enforce `require("fs").promises` | | | |
| [process-exit-as-throw](docs/rules/process-exit-as-throw.md) | require that `process.exit()` expressions use the same code path as `throw` | š¢ ā
| | |
| [shebang](docs/rules/shebang.md) | require correct usage of hashbang | | š§ | ā |
<!-- end auto-generated rules list -->
## š§ Configs
<!-- begin auto-generated configs list -->
| | Name |
| :- | :------------------- |
| š¢ | `recommended-module` |
| ā
| `recommended-script` |
<!-- end auto-generated configs list -->
About each config:
- `recommended`: Considers both CommonJS and ES Modules. If [`"type":"module"` field](https://medium.com/@nodejs/announcing-a-new-experimental-modules-1be8d2d6c2ff#b023) existed in package.json then it considers files as ES Modules. Otherwise it considers files as CommonJS. In addition, it considers `*.mjs` files as ES Modules and `*.cjs` files as CommonJS.
- `recommended-module`: Considers all files as ES Modules.
- `recommended-script`: Considers all files as CommonJS.
- `flat/all`: enables all of the rules shipped with the package. This configuration is **not recommended** for production use because it may change with every minor and major version. Use at your own risk.
These preset configs:
- enable [no-process-exit](http://eslint.org/docs/rules/no-process-exit) rule because [the official document](https://nodejs.org/api/process.html#process_process_exit_code) does not recommend a use of `process.exit()`.
- enable plugin rules indicated by emojis in the [rules table](#-rules).
- add `{ecmaVersion: 2021}` and etc into `parserOptions`.
- add proper globals into `globals`.
- add this plugin into `plugins`.
## š« FAQ
- Q: The `no-missing-import` / `no-missing-require` rules don't work with nested folders in SublimeLinter-eslint
- A: See [context.getFilename() in rule returns relative path](https://github.com/roadhump/SublimeLinter-eslint#contextgetfilename-in-rule-returns-relative-path) in the SublimeLinter-eslint FAQ.
- Q: How to use the flat eslint config with mixed commonjs and es modules?
- A: You can use the new exported flat config `flat/mixed-esm-and-cjs`, an example:
```js
const nodePlugin = require("eslint-plugin-n");
module.exports = [
...nodePlugin.configs["flat/mixed-esm-and-cjs"],
{
rules: {
"n/exports-style": ["error", "module.exports"],
},
},
]
```
## š„ Semantic Versioning Policy
`eslint-plugin-n` follows [semantic versioning](http://semver.org/) and [ESLint's Semantic Versioning Policy](https://github.com/eslint/eslint#semantic-versioning-policy).
- Patch release (intended to not break your lint build)
- A bug fix in a rule that results in it reporting fewer errors.
- Improvements to documentation.
- Non-user-facing changes such as refactoring code, adding, deleting, or modifying tests, and increasing test coverage.
- Re-releasing after a failed release (i.e., publishing a release that doesn't work for anyone).
- Minor release (might break your lint build)
- A bug fix in a rule that results in it reporting more errors.
- A new rule is created.
- A new option to an existing rule is created.
- An existing rule is deprecated.
- Major release (likely to break your lint build)
- A support for old Node version is dropped.
- A support for old ESLint version is dropped.
- An existing rule is changed in it reporting more errors.
- An existing rule is removed.
- An existing option of a rule is removed.
- An existing config is updated.
Deprecated rules follow ESLint's [deprecation policy](https://eslint.org/docs/user-guide/rule-deprecation).
## š° Changelog
- [GitHub Releases](https://github.com/eslint-community/eslint-plugin-n/releases)
## ā¤ļø Contributing
Welcome contributing!
Please use GitHub's Issues/PRs.
### Development Tools
- `npm test` runs tests and measures coverage.
- `npm run coverage` shows the coverage result of `npm test` command.
- `npm run clean` removes the coverage result of `npm test` command.