eslint-plugin-unicorn

More than 300 powerful ESLint rules

Most rules target JavaScript and TypeScript, but some also lint CSS, HTML, JSON, and Markdown when used with the matching ESLint language plugin.

Propose a new rule ➡

We do not accept pull requests because of too much AI slop.

Install

npm install --save-dev eslint eslint-plugin-unicorn

Requires ESLint >=10.4, flat config, and ESM.

You might want to check out XO, which includes this plugin.

Usage

Use a preset config or configure each rule in eslint.config.js.

If you don't use a preset, set the same languageOptions as shown below.

import unicorn from 'eslint-plugin-unicorn';
import {defineConfig} from 'eslint/config';
import globals from 'globals';

export default defineConfig([
    {
        files: ['**/*.js'],
        languageOptions: {
            globals: globals.builtin,
        },
        plugins: {
            unicorn,
        },
        rules: {
            'unicorn/prefer-module': 'error',
            'unicorn/…': 'error',
        },
    },
    // …
]);

For TypeScript, scope Unicorn to TypeScript files and configure a TypeScript parser for the same config object:

import typescriptEslintParser from '@typescript-eslint/parser';
import unicorn from 'eslint-plugin-unicorn';
import {defineConfig} from 'eslint/config';
import globals from 'globals';

export default defineConfig([
    {
        files: ['**/*.ts'],
        languageOptions: {
            globals: globals.builtin,
            parser: typescriptEslintParser,
        },
        plugins: {
            unicorn,
        },
        rules: {
            'unicorn/prefer-module': 'error',
            'unicorn/…': 'error',
        },
    },
    // …
]);

Rules

💼 Configurations enabled in.\ ✅ Set in the recommended configuration.\ ☑️ Set in the unopinionated configuration.\ 🔧 Automatically fixable by the --fix CLI option.\ 💡 Manually fixable by editor suggestions.\ 💭 Requires type information.