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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.
Additional ESLint rules for Node.js
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 | 🏃♂️actively maintained |
16.x | >=16.0.0 | >=7.0.0 | |
15.x | >=12.22.0 | >=7.0.0 |
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" }}
The rules get the supported Node.js version range from the following, falling back to the next if unspecified:
- Rule configuration
version
- ESLintshared setting
node.version
package.json
[engines
] field>=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.
💼Configurations enabled in.
🟢 Set in therecommended-module
configuration.
✅ Set in therecommended-script
configuration.
🔧 Automatically fixable by the--fix
CLI option.
❌ Deprecated.
Name | Description | 💼 | 🔧 | ❌ |
---|---|---|---|---|
callback-return | requirereturn statements after callbacks | |||
exports-style | enforce eithermodule.exports orexports | 🔧 | ||
file-extension-in-import | enforce the style of file extensions inimport declarations | 🔧 | ||
global-require | requirerequire() calls to be placed at top-level module scope | |||
handle-callback-err | require error handling in callbacks | |||
hashbang | require correct usage of hashbang | 🟢 ✅ | 🔧 | |
no-callback-literal | enforce Node.js-style error-first callback pattern is followed | |||
no-deprecated-api | disallow deprecated APIs | 🟢 ✅ | ||
no-exports-assign | disallow the assignment toexports | 🟢 ✅ | ||
no-extraneous-import | disallowimport declarations which import extraneous modules | 🟢 ✅ | ||
no-extraneous-require | disallowrequire() expressions which import extraneous modules | 🟢 ✅ | ||
no-hide-core-modules | disallow third-party modules which are hiding core modules | ❌ | ||
no-missing-import | disallowimport declarations which import non-existence modules | 🟢 ✅ | ||
no-missing-require | disallowrequire() expressions which import non-existence modules | 🟢 ✅ | ||
no-mixed-requires | disallowrequire calls to be mixed with regular variable declarations | |||
no-new-require | disallownew operators with calls torequire | |||
no-path-concat | disallow string concatenation with__dirname and__filename | |||
no-process-env | disallow the use ofprocess.env | |||
no-process-exit | disallow the use ofprocess.exit() | 🟢 ✅ | ||
no-restricted-import | disallow specified modules when loaded byimport declarations | |||
no-restricted-require | disallow specified modules when loaded byrequire | |||
no-sync | disallow synchronous methods | |||
no-top-level-await | disallow top-levelawait in published modules | |||
no-unpublished-bin | disallowbin files that npm ignores | 🟢 ✅ | ||
no-unpublished-import | disallowimport declarations which import private modules | 🟢 ✅ | ||
no-unpublished-require | disallowrequire() expressions which import private modules | 🟢 ✅ | ||
no-unsupported-features/es-builtins | disallow unsupported ECMAScript built-ins on the specified version | 🟢 ✅ | ||
no-unsupported-features/es-syntax | disallow unsupported ECMAScript syntax on the specified version | 🟢 ✅ | ||
no-unsupported-features/node-builtins | disallow unsupported Node.js built-in APIs on the specified version | 🟢 ✅ | ||
prefer-global/buffer | enforce eitherBuffer orrequire("buffer").Buffer | |||
prefer-global/console | enforce eitherconsole orrequire("console") | |||
prefer-global/process | enforce eitherprocess orrequire("process") | |||
prefer-global/text-decoder | enforce eitherTextDecoder orrequire("util").TextDecoder | |||
prefer-global/text-encoder | enforce eitherTextEncoder orrequire("util").TextEncoder | |||
prefer-global/url | enforce eitherURL orrequire("url").URL | |||
prefer-global/url-search-params | enforce eitherURLSearchParams orrequire("url").URLSearchParams | |||
prefer-node-protocol | enforce using thenode: protocol when importing Node.js builtin modules. | 🔧 | ||
prefer-promises/dns | enforcerequire("dns").promises | |||
prefer-promises/fs | enforcerequire("fs").promises | |||
process-exit-as-throw | require thatprocess.exit() expressions use the same code path asthrow | 🟢 ✅ | ||
shebang | require correct usage of hashbang | 🔧 | ❌ |
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 of
process.exit()
. - enable plugin rules indicated by emojis in therules table.
- add
{ecmaVersion: 2021}
and etc intoparserOptions
. - add proper globals into
globals
. - add this plugin into
plugins
.
Q: The
no-missing-import
/no-missing-require
rules don't work with nested folders in SublimeLinter-eslintA: 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 config
flat/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"],},},]
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.
Welcome contributing!
Please use GitHub's Issues/PRs.
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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