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Additional ESLint rules for Node.js

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eslint-community/eslint-plugin-n

 
 

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forked fromeslint-plugin-node v11.1.0. as the original repository seemsno longer maintained.

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Additional ESLint rules for Node.js

🎨 Playground

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💿 Install & Usage

npm install --save-dev eslint eslint-plugin-n
VersionSupported Node.jsSupported ESLint VersionStatus
17.x^18.18.0 || ^20.9.0 || >=21.1.0>=8.23.0🏃‍♂️actively maintained
16.x>=16.0.0>=7.0.0⚠️EOL
15.x>=12.22.0>=7.0.0⚠️EOL

Note: It recommends a use ofthe "engines" field of package.json. The "engines" field is used byn/no-unsupported-features/* rules.

eslint.config.js (requires eslint>=v8.23.0)

constnodePlugin=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:

constnodePlugin=require("eslint-plugin-n")module.exports=[{plugins:{n:nodePlugin},rules:{"n/exports-style":["error","module.exports"]}}]

.eslintrc.json (legacy example)

{"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:

{"parserOptions": {"ecmaVersion":2021    },"plugins": ["n"],"rules": {"n/exports-style": ["error","module.exports"]    }}

package.json (An example)

{"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 configurationversion
  2. ESLintshared settingnode.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 since16 is the maintained lts (see alsoNode.js Release Working Group).

For Node.js packages, using the [engines] field is recommended because it's the official way to indicate support:

{"name":"your-module","version":"1.0.0","engines": {"node":">=16.0.0"    }}

ForShareable Configs or packages with a different development environment (e.g. pre-compiled, web package, etc.), you can configure ESLint withsettings.node.version to specify support.

📖 Rules

💼Configurations enabled in.
🟢 Set in therecommended-moduleconfiguration.
✅ Set in therecommended-scriptconfiguration.
🔧 Automatically fixable by the--fix CLI option.
❌ Deprecated.

Name                                 Description💼🔧
callback-returnrequirereturn statements after callbacks
exports-styleenforce eithermodule.exports orexports🔧
file-extension-in-importenforce the style of file extensions inimport declarations🔧
global-requirerequirerequire() calls to be placed at top-level module scope
handle-callback-errrequire error handling in callbacks
hashbangrequire correct usage of hashbang🟢 ✅🔧
no-callback-literalenforce Node.js-style error-first callback pattern is followed
no-deprecated-apidisallow deprecated APIs🟢 ✅
no-exports-assigndisallow the assignment toexports🟢 ✅
no-extraneous-importdisallowimport declarations which import extraneous modules🟢 ✅
no-extraneous-requiredisallowrequire() expressions which import extraneous modules🟢 ✅
no-hide-core-modulesdisallow third-party modules which are hiding core modules
no-missing-importdisallowimport declarations which import non-existence modules🟢 ✅
no-missing-requiredisallowrequire() expressions which import non-existence modules🟢 ✅
no-mixed-requiresdisallowrequire calls to be mixed with regular variable declarations
no-new-requiredisallownew operators with calls torequire
no-path-concatdisallow string concatenation with__dirname and__filename
no-process-envdisallow the use ofprocess.env
no-process-exitdisallow the use ofprocess.exit()🟢 ✅
no-restricted-importdisallow specified modules when loaded byimport declarations
no-restricted-requiredisallow specified modules when loaded byrequire
no-syncdisallow synchronous methods
no-top-level-awaitdisallow top-levelawait in published modules
no-unpublished-bindisallowbin files that npm ignores🟢 ✅
no-unpublished-importdisallowimport declarations which import private modules🟢 ✅
no-unpublished-requiredisallowrequire() expressions which import private modules🟢 ✅
no-unsupported-features/es-builtinsdisallow unsupported ECMAScript built-ins on the specified version🟢 ✅
no-unsupported-features/es-syntaxdisallow unsupported ECMAScript syntax on the specified version🟢 ✅
no-unsupported-features/node-builtinsdisallow unsupported Node.js built-in APIs on the specified version🟢 ✅
prefer-global/bufferenforce eitherBuffer orrequire("buffer").Buffer
prefer-global/consoleenforce eitherconsole orrequire("console")
prefer-global/processenforce eitherprocess orrequire("process")
prefer-global/text-decoderenforce eitherTextDecoder orrequire("util").TextDecoder
prefer-global/text-encoderenforce eitherTextEncoder orrequire("util").TextEncoder
prefer-global/urlenforce eitherURL orrequire("url").URL
prefer-global/url-search-paramsenforce eitherURLSearchParams orrequire("url").URLSearchParams
prefer-node-protocolenforce using thenode: protocol when importing Node.js builtin modules.🔧
prefer-promises/dnsenforcerequire("dns").promises
prefer-promises/fsenforcerequire("fs").promises
process-exit-as-throwrequire thatprocess.exit() expressions use the same code path asthrow🟢 ✅
shebangrequire correct usage of hashbang🔧

🔧 Configs

Name
🟢recommended-module
recommended-script

About each config:

  • recommended: Considers both CommonJS and ES Modules. If"type":"module" field 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 isnot recommended for production use because it may change with every minor and major version. Use at your own risk.

These preset configs:

  • enableno-process-exit rule becausethe official document does not recommend a use ofprocess.exit().
  • enable plugin rules indicated by emojis in therules table.
  • add{ecmaVersion: 2021} and etc intoparserOptions.
  • add proper globals intoglobals.
  • add this plugin intoplugins.

👫 FAQ

  • Q: Theno-missing-import /no-missing-require rules don't work with nested folders in SublimeLinter-eslint

  • A: Seecontext.getFilename() 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 configflat/mixed-esm-and-cjs, an example:

constnodePlugin=require("eslint-plugin-n");module.exports=[  ...nodePlugin.configs["flat/mixed-esm-and-cjs"],{rules:{"n/exports-style":["error","module.exports"],},},]

🚥 Semantic Versioning Policy

eslint-plugin-n followssemantic versioning andESLint's 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'sdeprecation policy.

📰 Changelog

❤️ 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 ofnpm test command.
  • npm run clean removes the coverage result ofnpm test command.

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