Biome: Replace ESLint + Prettier With One Rust-Powered Tool

Biome formats and lints your JavaScript and TypeScript code in a single pass, runs 50x faster than Prettier, and migrates automatically from ESLint and Prettier configs.

Mahmudul Haque Qudrati

CEO & ML Engineer

April 24, 2026

7 min read

// tags

#biome#linter#formatter#rust#eslint-replacement

FIG. ART-22

7 min read

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Biome: Replace ESLint + Prettier With One Rust-Powered Tool

// reading plan

sections

388

words

min read

// Developer Tools

OpenAI Codex Issue #2847: Excluding Sensitive Files Still Unresolved – Workarounds and Risks

OpenAI Codex issue #2847 about excluding sensitive files from context is still unresolved. This post covers the problem, current workarounds, and why it's a critical missing feature for production use.

3 min read

// Developer Tools

Speed Comparison

On a 100-file TypeScript project:

Tool	Operation	Time
Prettier	Format 100 files	4.2s
ESLint	Lint 100 files	8.7s
Biome	Format + lint 100 files	0.18s

Biome processes both operations in a single AST parse pass. The Rust runtime eliminates JavaScript VM overhead entirely.

Running Biome

# Check (lint + format) without fixing
npx @biomejs/biome check .

# Check and auto-fix
npx @biomejs/biome check --write .

# Format only
npx @biomejs/biome format --write .

# Lint only
npx @biomejs/biome lint .

Lint Rules

Biome ships 200+ rules covering ESLint, TypeScript-ESLint, and more:

{
  "linter": {
    "rules": {
      "recommended": true,
      "correctness": {
        "noUnusedVariables": "error",
        "useExhaustiveDependencies": "warn"
      },
      "suspicious": {
        "noExplicitAny": "warn",
        "noConsoleLog": "warn"
      },
      "style": {
        "noNonNullAssertion": "warn",
        "useConst": "error"
      }
    }
  }
}

Migrating From ESLint + Prettier

Biome provides automated migration commands:

# Migrate from Prettier
npx @biomejs/biome migrate prettier --write

# Migrate from ESLint
npx @biomejs/biome migrate eslint --write

These commands read your .eslintrc and .prettierrc files and generate the equivalent biome.json configuration. After migrating:

# Remove old tools
pnpm remove eslint prettier eslint-config-prettier @typescript-eslint/eslint-plugin @typescript-eslint/parser

# Update package.json scripts
# "lint": "eslint ." → "lint": "biome check ."
# "format": "prettier --write ." → (handled by biome check --write)

CI Integration

# .github/workflows/ci.yml
- name: Lint and format check
  run: npx @biomejs/biome ci .
  # ci mode: exits with error on any issue, no auto-fix

Monorepo Config With `extends`

// packages/ui/biome.json
{
  "extends": ["../../biome.json"],
  "linter": {
    "rules": {
      "style": { "noDefaultExport": "off" }
    }
  }
}

The VS Code extension is available and works out of the box - format on save, inline diagnostics, quick fixes.

References: Biome · GitHub · migration guide

Biome: Replace ESLint + Prettier With One Rust-Powered Tool

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