# eslint-plugin-node

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Additional ESLint's rules for Node.js

## 💿 Install & Usage

```
$ npm install --save-dev eslint eslint-plugin-node
```

- Requires Node.js `>=6.0.0`
- Requires ESLint `>=4.19.1` (`plugin:node/recommended` preset requires `>=5.0.0`)

**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 `node/no-unsupported-features/*` rules.

**.eslintrc.json** (An example)

```json
{
    "extends": ["eslint:recommended", "plugin:node/recommended"],
    "rules": {
        "node/exports-style": ["error", "module.exports"],
        "node/prefer-global/buffer": ["error", "always"],
        "node/prefer-global/console": ["error", "always"],
        "node/prefer-global/process": ["error", "always"],
        "node/prefer-global/url-search-params": ["error", "always"],
        "node/prefer-global/url": ["error", "always"]
    }
}
```

**package.json** (An example)

```json
{
    "name": "your-module",
    "version": "1.0.0",
    "engines": {
        "node": ">=6.0.0"
    }
}
```

## 📖 Rules

- ⭐️ - the mark of recommended rules.
- ✒️ - the mark of fixable rules.

<!--RULES_TABLE_START-->
### Possible Errors

| Rule ID | Description |    |
|:--------|:------------|:--:|
| [node/no-extraneous-import](./docs/rules/no-extraneous-import.md) | disallow `import` declarations of extraneous packages |  |
| [node/no-extraneous-require](./docs/rules/no-extraneous-require.md) | disallow `require()` expressions of extraneous packages | ⭐️ |
| [node/no-missing-import](./docs/rules/no-missing-import.md) | disallow `import` declarations of missing files |  |
| [node/no-missing-require](./docs/rules/no-missing-require.md) | disallow `require()` expressions of missing files | ⭐️ |
| [node/no-unpublished-bin](./docs/rules/no-unpublished-bin.md) | disallow 'bin' files which are ignored by npm | ⭐️ |
| [node/no-unpublished-import](./docs/rules/no-unpublished-import.md) | disallow `import` declarations of private things |  |
| [node/no-unpublished-require](./docs/rules/no-unpublished-require.md) | disallow `require()` expressions of private things | ⭐️ |
| [node/no-unsupported-features/es-builtins](./docs/rules/no-unsupported-features/es-builtins.md) | disallow unsupported ECMAScript built-ins on the specified version | ⭐️ |
| [node/no-unsupported-features/es-syntax](./docs/rules/no-unsupported-features/es-syntax.md) | disallow unsupported ECMAScript syntax on the specified version | ⭐️ |
| [node/no-unsupported-features/node-builtins](./docs/rules/no-unsupported-features/node-builtins.md) | disallow unsupported Node.js built-in APIs on the specified version | ⭐️ |
| [node/process-exit-as-throw](./docs/rules/process-exit-as-throw.md) | make `process.exit()` expressions the same code path as `throw` | ⭐️ |
| [node/shebang](./docs/rules/shebang.md) | enforce the correct usage of shebang | ⭐️✒️ |

### Best Practices

| Rule ID | Description |    |
|:--------|:------------|:--:|
| [node/no-deprecated-api](./docs/rules/no-deprecated-api.md) | disallow deprecated APIs | ⭐️ |

### Stylistic Issues

| Rule ID | Description |    |
|:--------|:------------|:--:|
| [node/exports-style](./docs/rules/exports-style.md) | enforce either `module.exports` or `exports` |  |
| [node/prefer-global/buffer](./docs/rules/prefer-global/buffer.md) | enforce either `Buffer` or `require("buffer").Buffer` |  |
| [node/prefer-global/console](./docs/rules/prefer-global/console.md) | enforce either `console` or `require("console")` |  |
| [node/prefer-global/process](./docs/rules/prefer-global/process.md) | enforce either `process` or `require("process")` |  |
| [node/prefer-global/text-decoder](./docs/rules/prefer-global/text-decoder.md) | enforce either `TextDecoder` or `require("util").TextDecoder` |  |
| [node/prefer-global/text-encoder](./docs/rules/prefer-global/text-encoder.md) | enforce either `TextEncoder` or `require("util").TextEncoder` |  |
| [node/prefer-global/url-search-params](./docs/rules/prefer-global/url-search-params.md) | enforce either `URLSearchParams` or `require("url").URLSearchParams` |  |
| [node/prefer-global/url](./docs/rules/prefer-global/url.md) | enforce either `URL` or `require("url").URL` |  |

### Deprecated rules

These rules have been deprecated in accordance with the [deprecation policy](https://eslint.org/docs/user-guide/rule-deprecation), and replaced by newer rules:

| Rule ID | Replaced by |
|:--------|:------------|
| [node/no-hide-core-modules](./docs/rules/no-hide-core-modules.md) | (nothing) |
| [node/no-unsupported-features](./docs/rules/no-unsupported-features.md) | [node/no-unsupported-features/es-syntax](./docs/rules/no-unsupported-features/es-syntax.md) and [node/no-unsupported-features/es-builtins](./docs/rules/no-unsupported-features/es-builtins.md) |

<!--RULES_TABLE_END-->

## 🔧 Configs

This plugin provides `plugin:node/recommended` preset config.
This preset config:

- enables the environment of ES2015 (ES6) and Node.js.
- enables rules which are given :star: in the above table.
- enables [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()`.
- adds `{ecmaVersion: 2019}` into `parserOptions`.
- adds `Atomics` and `SharedArrayBuffer` into `globals`.
- adds this plugin into `plugins`.

## 👫 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.

## 🚥 Semantic Versioning Policy

`eslint-plugin-node` 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.

## 📰 Changelog

- [GitHub Releases](https://github.com/mysticatea/eslint-plugin-node/releases)

## 💎 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.