DEV Community

Alex Spinov
Alex Spinov

Posted on

Biome Has a Free Toolchain That Replaces ESLint + Prettier — 35x Faster, One Config File

#webdev #javascript #typescript #tooling

The Tooling Problem

Your JavaScript project has:

  • .eslintrc.js (150 rules configured)
  • .prettierrc (formatting preferences)
  • eslint-config-prettier (to make them not fight)
  • 50+ eslint plugins in node_modules
  • 30-second lint time on CI

Biome replaces all of it. One tool. One config. Written in Rust. 35x faster than ESLint.

What Biome Gives You

Linting + Formatting in One Tool 

# Format AND lint in one command
biome check --write .

# Just format
biome format --write .

# Just lint
biome lint .
Enter fullscreen mode Exit fullscreen mode

No more ESLint-Prettier conflicts. Biome's formatter and linter are designed to work together.

300+ Lint Rules (Built In) 

{
  "linter": {
    "rules": {
      "suspicious": {
        "noDoubleEquals": "error",
        "noExplicitAny": "warn"
      },
      "complexity": {
        "noForEach": "warn"
      },
      "correctness": {
        "noUnusedVariables": "error"
      }
    }
  }
}
Enter fullscreen mode Exit fullscreen mode

Covers: ESLint core, typescript-eslint, eslint-plugin-react, eslint-plugin-jsx-a11y, eslint-plugin-import — all built in.

Performance

Tool 1,000 files 10,000 files
ESLint + Prettier 12s 120s
Biome 0.3s 3.4s

35x faster. On CI, that's the difference between a 2-minute wait and instant feedback.

Import Sorting 

{
  "organizeImports": {
    "enabled": true
  }
}
Enter fullscreen mode Exit fullscreen mode

No more eslint-plugin-import or @trivago/prettier-plugin-sort-imports. Built in.

CSS and JSON Support 

biome format --write "src/**/*.css"
biome lint "src/**/*.json"
Enter fullscreen mode Exit fullscreen mode

Lints and formats CSS, JSON, and JSONC files too.

Migration From ESLint 

biome migrate eslint --write
Enter fullscreen mode Exit fullscreen mode

Reads your .eslintrc and generates equivalent biome.json. One command migration.

Quick Start 

npm install --save-dev @biomejs/biome
npx biome init
npx biome check --write .
Enter fullscreen mode Exit fullscreen mode

Why This Matters

JavaScript tooling shouldn't take longer than your code to run. Biome proves that linting + formatting can be instant, configured in one file, and installed as one dependency.

Building developer tools? Check out my web scraping actors on Apify Store — get structured data for your projects. For custom solutions, email spinov001@gmail.com.

Top comments (0)