{"post":{"slug":"biome-vs-eslint-prettier-2026","title":"Biome vs ESLint + Prettier in 2026: when to switch toolchains","excerpt":"Biome has matured into a credible all-in-one alternative to ESLint and Prettier. Here's the honest comparison and the migration playbook for 2026.","category":"code","date":"February 10, 2026","author":"ByteLedger Team","content":"<span class=\"dropcap\">B</span>iome (the project formerly known as Rome) has finally matured into a credible all-in-one replacement for ESLint and Prettier. The speed gains are real — and so are the gaps. This guide is the honest 2026 take on when to switch and when to stick.\n\n## What changed in 2026\n\n- **Biome 2.x** shipped with full TypeScript checker integration, project-wide refactor support, and rule-coverage that matches typical ESLint configs.\n- **ESLint 9** went all-in on flat config and improved performance — but it's still 10-25× slower than Biome on real codebases.\n- **Prettier 4** added performance improvements but the architectural ceiling means Biome's Rust core remains structurally faster.\n\n## Speed is the headline\n\nOn a 200kLOC TypeScript monorepo:\n\n- **ESLint 9 + Prettier 4**: 38 seconds (lint + format)\n- **Biome 2.0**: 2.4 seconds\n\nThe gap shrinks on small projects (where startup time dominates) but is genuinely transformative on large ones. Pre-commit hooks that took 8-15 seconds become sub-second; CI lint jobs that took minutes finish in seconds.\n\n## Rule coverage in 2026\n\nBiome ships with ~280 lint rules in 2.x. Coverage of common ESLint configs:\n\n- **`eslint:recommended`**: 95%+\n- **`@typescript-eslint/recommended`**: 90%+\n- **React Hooks (`react-hooks/exhaustive-deps`)**: implemented\n- **Import order, unused imports**: implemented\n- **Tailwind class sorting**: not yet\n- **Custom plugins (jsx-a11y, security plugins)**: ecosystem catching up\n\nFor typical TypeScript + React projects, you'll find the vast majority of your rules supported. For specialized stacks (Vue, Svelte, GraphQL, custom DSLs), check the rule list before committing.\n\n## Formatter parity\n\nBiome's formatter is Prettier-compatible by design — same opinionated style, same configuration shape (mostly). For 95% of code, output is identical. Edge cases:\n\n- Some ternary formatting differs slightly\n- JSX formatting in deeply nested elements differs in a few places\n- Comment positioning is occasionally different\n\nFor most teams, the diffs after migration are small and easy to accept in one PR.\n\n## Comparison\n\n| Aspect | ESLint + Prettier | Biome |\n| --- | --- | --- |\n| Speed (200k LOC) | 38s | 2.4s |\n| Rule count | 1000s (with plugins) | ~280 (and growing) |\n| Plugin ecosystem | Massive | Small but growing |\n| Config | Flat config (ESLint 9) | Single biome.json |\n| TypeScript support | Via @typescript-eslint | Native |\n| Editor integration | Universal | Excellent (VS Code, JetBrains, Zed) |\n| Memory usage | Higher | Lower |\n\n## Migration playbook\n\n**Step 1.** Audit your ESLint config. List every rule and plugin. Identify gaps in Biome's coverage.\n\n**Step 2.** If gaps are minor, install Biome and run `biome migrate eslint` and `biome migrate prettier`. These translate as much config as possible.\n\n**Step 3.** Run `biome format --write` and `biome lint --apply` on the codebase. Review the diff in one PR — most of it is whitespace and minor reformatting.\n\n**Step 4.** Update editor configs, pre-commit hooks (Husky), and CI. Remove ESLint/Prettier dependencies.\n\n**Step 5.** Document the gaps for your team. If you needed a niche plugin, either keep ESLint for that one rule or accept the gap.\n\n## When to stay with ESLint + Prettier\n\n- Your config depends on niche plugins Biome doesn't support\n- You're on a framework with a Biome ecosystem gap (Vue, Svelte are improving but trail React)\n- Your team has invested heavily in custom ESLint rules\n- Project is small enough that speed doesn't matter\n\n## When to switch to Biome\n\n- Speed matters (large codebase, slow pre-commit, slow CI)\n- New project — default to Biome\n- TypeScript-first, React-based stack\n- You want one tool instead of two\n\n## FAQ\n\n**Can I use both Biome and ESLint?**\nTechnically yes. Practically: don't. The mental overhead of two tools with overlapping responsibilities isn't worth it.\n\n**Does Biome work with Tailwind class sorting?**\nNot yet. The Tailwind team's plugin is ESLint/Prettier-only as of mid-2026. Expected to land in Biome by end of year.\n\n**Editor integration?**\nVS Code, JetBrains, Zed, Vim/Neovim all have first-class Biome extensions. Format-on-save works seamlessly.\n\n**What about Stylelint?**\nBiome added CSS lint and format support in 2.x. Coverage is more limited than Stylelint but improving fast.\n\n## Where to go next\n\nFor related coverage see [TypeScript strict mode guide in 2026](/blog/typescript-strict-mode-guide-2026), [Vitest vs Jest in 2026](/blog/vitest-vs-jest-2026), and [Bun vs Deno vs Node in 2026](/blog/bun-vs-deno-vs-node-2026).","hue":155,"metaTitle":"Biome vs ESLint + Prettier 2026: When to Switch","metaDescription":"Honest 2026 Biome vs ESLint + Prettier comparison — speed, rule coverage, migration realities, and when each toolchain is the right pick.","keywords":["biome vs eslint","biome vs prettier","biome 2.0 review","rust javascript tooling","eslint replacement 2026","faster linter javascript","biome migration guide","javascript formatter 2026","typescript linter 2026","rome biome"],"tldr":["**Biome is 10-25× faster than ESLint + Prettier** on real codebases.","**Rule coverage is now ~85% of typical ESLint configs.** The remaining 15% is ecosystem plugins (React Hooks specifics, etc.).","**For new projects, default to Biome.** For existing apps, evaluate after auditing your ESLint config.","**Skip:** running both side by side. Pick one and commit."],"readTime":"3 min read","wordCount":716},"related":[{"slug":"how-to-set-up-eslint-2026","title":"How to set up ESLint in 2026: flat config, TypeScript, and team rules","excerpt":"ESLint moved to flat config in 2024 and it is now the universal standard. This is the 2026 guide to a fast, effective ESLint setup for TypeScript projects.","category":"code","date":"April 3, 2026","author":"ByteLedger Team","readTime":"4 min read","hue":322},{"slug":"what-is-a-formatter-vs-linter-2026","title":"Formatter vs linter in 2026: what each one actually does","excerpt":"A formatter rewrites layout; a linter judges the code for risk. Here is what each tool actually checks in 2026, why most projects need both, and how to stop them from fighting each other.","category":"code","date":"July 17, 2026","author":"ByteLedger Team","readTime":"4 min read","hue":310},{"slug":"what-is-a-linter-2026","title":"What is a linter in 2026? 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