ESLint Formatter Pico Stylish

A lightweight, secure alternative to ESLint's built-in "stylish" formatter that uses picocolors instead of chalk.

Why This Package Exists

This project was created to address several issues with ESLint's built-in stylish formatter:

• Security Concerns: ESLint's "stylish" formatter relies on chalk, which has experienced security vulnerabilities as part of supply chain attacks
• Dependency Resolution Issues: Chalk 5 is ESM-only, but ESLint still requires CommonJS for formatters, forcing the built-in formatter to use chalk 4
• Package Resolution Conflicts: Many projects mitigate this by enforcing specific chalk v5 versions via yarn resolutions or similar mechanisms, which breaks ESLint's formatter
• Heavy Dependencies: Chalk comes with its own dependency tree, adding unnecessary weight

Solution

This formatter mirrors the exact output format of ESLint's built-in "stylish" formatter while using:

• picocolors: A tiny, fast, and secure alternative to chalk with zero dependencies
• TypeScript: Provides type safety and allows for future enhancements
• CommonJS: Compatible with ESLint's formatter requirements

Installation

npm install @bob-obringer/eslint-formatter-pico-stylish
# or
yarn add @bob-obringer/eslint-formatter-pico-stylish
# or
pnpm add @bob-obringer/eslint-formatter-pico-stylish

Usage

Use the formatter with ESLint's --format option:

eslint --format @bob-obringer/eslint-formatter-pico-stylish .

Or configure it in your ESLint configuration file:

{
  "format": "@bob-obringer/eslint-formatter-pico-stylish"
}

Output

The formatter produces identical output to ESLint's built-in "stylish" formatter:

/path/to/file.js
  1:1  error    Unexpected token  syntax-error
  2:5  warning  'foo' is defined but never used  no-unused-vars

✖ 2 problems (1 error, 1 warning)
  0 errors and 1 warning potentially fixable with the `--fix` option.

Features

• ✅ Identical output to ESLint's built-in stylish formatter
• ✅ Zero dependencies (picocolors has no dependencies)
• ✅ Tiny bundle size
• ✅ TypeScript support
• ✅ CommonJS compatible
• ✅ Secure alternative to chalk-based formatters

Dependencies

• picocolors - The smallest and fastest library for terminal colors

License

MIT

Contributing

Issues and pull requests are welcome on GitHub.