eslint-unicorn

library55.0.0jsnpmunverified

ESLint plugin providing more than 100 powerful rules for enforcing consistent, error-free code style and catching common mistakes. Current stable version is 55.0.0, with frequent releases (often multiple per month). Key differentiators include a broad focus beyond stylistic concerns (e.g., security, performance, best practices), automatic fixing for many rules, and strong integration with XO. It requires ESLint >=8.56.0 and Node >=18.18, and ships TypeScript definitions.

testing devops

npm install eslint-unicorn

github ↗package ↗

INSTALL

IMPORT

SIG · ESLINT-UNICORN

eslint-unicorn

testingjavascriptv55.0.0

Install

—

Import

—

Disk

—

Pass rate

0/ 6

Env Coverage0 / 6

glibc

18–22

musl

18–22

Install & Compatibility

Where this runs

tested against v? · npm install

Install × environment matrix

Each cell = how many times install + import succeeded across repeated harness runs. Partial = flaky.
glibc = Debian/Ubuntu slim · musl = Alpine Linux

musl

node 18–226 runs

build_error

glibc

node 18–226 runs

build_error

Code

Verified usage

Verified import paths — ran on the pinned version, not inferred.

eslintPluginUnicorn

✓ import eslintPluginUnicorn from 'eslint-plugin-unicorn';

✗ const eslintPluginUnicorn = require('eslint-plugin-unicorn').default;

Default export is the plugin object. In CommonJS, use `require('eslint-plugin-unicorn')` directly without .default.

configs.recommended

✓ import eslintPluginUnicorn from 'eslint-plugin-unicorn'; eslintPluginUnicorn.configs.recommended

✗ const { configs } = require('eslint-plugin-unicorn');

Access recommended config via the default export. In CJS, use `require('eslint-plugin-unicorn').configs.recommended`.

rules

✓ import eslintPluginUnicorn from 'eslint-plugin-unicorn'; eslintPluginUnicorn.rules['unicorn/better-regex']

✗ const rules = require('eslint-plugin-unicorn/rules');

Rules are accessed via the plugin object's 'rules' property. There is no separate 'rules' export.

Shows how to set up eslint-plugin-unicorn with flat config (ESLint >=8.56.0) using the recommended preset and additional rules.

import eslintPluginUnicorn from 'eslint-plugin-unicorn'; import globals from 'globals'; export default [ eslintPluginUnicorn.configs.recommended, { languageOptions: { globals: globals.builtin, }, plugins: { unicorn: eslintPluginUnicorn, }, rules: { 'unicorn/better-regex': 'error', 'unicorn/catch-error-name': 'error', }, }, ];

Debug

Known issues

breakingMinimum Node.js version is 18.18 starting from v60.0.0

fix

Update Node.js to >=18.18 or pin eslint-plugin-unicorn to <60.0.0.

affects: >=60.0.0

deprecatedRule 'no-array-push-push' renamed to 'prefer-single-call' in v59.0.0

fix

Replace 'unicorn/no-array-push-push' with 'unicorn/prefer-single-call'.

affects: >=59.0.0

deprecatedRule 'no-length-as-slice-end' renamed to 'no-unnecessary-slice-end' in v59.0.0

fix

Replace 'unicorn/no-length-as-slice-end' with 'unicorn/no-unnecessary-slice-end'.

affects: >=59.0.0

breakingESLint <8.56.0 is no longer supported (flat config required starting v55?)

fix

Upgrade ESLint to >=8.56.0 and migrate to flat config (eslint.config.js).

affects: >=55.0.0

gotchaFlat config (eslint.config.js) requires explicit import of plugin; global plugins no longer work

fix

Import the plugin in eslint.config.js as shown in the quickstart.

affects: >=55.0.0

Errors

Common errors & fixes

Oops! Something went wrong! :( ESLint: 8.x.x. eslint-plugin-unicorn: 55.x.x. No configuration matching.

Using older ESLint version or missing flat config migration

fix

Update ESLint to >=8.56.0 and use eslint.config.js.

Error: Cannot find module 'eslint-plugin-unicorn'

Package not installed or missing in node_modules

fix

Run 'npm install --save-dev eslint eslint-plugin-unicorn'.

TypeError: eslintPluginUnicorn is not a function

Incorrectly importing default export in CommonJS

fix

Use 'const eslintPluginUnicorn = require('eslint-plugin-unicorn');' (no .default).

Upgrade

Version history

55.0.0latest on npm

Audit

Dependencies

eslintrequiredpeer dependency required for plugin to run

globalsoptionalcommonly used alongside to provide builtin globals in flat config

Agent activity

2 hits · last 30 days

node

Resources

githubhttps://github.com/sindresorhus/eslint-plugin-unicorn ↗

packagehttps://www.npmjs.com/package/eslint-unicorn ↗