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Biome v2.0 Beta - Comprehensive JavaScript/TypeScript toolchain combining linting, formatting, type-checking, bundling, testing, & more

 

🌟 What Is Biome?



Biome is a comprehensive JavaScript/TypeScript toolchain combining linting, formatting, type-checking, bundling, testing, and more. It started as a continuation [of the Facebook’s Rome project](elite one) and is now a standalone open‑source project maintained by its original contributors github.com+12i-programmer.info+12segmentfault.com+12.

🚀 v2.0 Beta Launch (March 24 – June 2025)

The Biome team announced the v2.0 Beta release on March 24, 2025, and coverage followed in June . The update brings major enhancements and lays the groundwork for a robust final version.

How to try it:

bash

npm install --save-dev --save-exact @biomejs/biome@beta
npx @biomejs/biome@beta migrate --write

You'll also need the prerelease versions of Biome IDE extensions. Docs are hosted at next.biomejs.dev github.com+7biomejs.dev+7next.biomejs.dev+7.

🔧 Key Enhancements in v2.0 Beta

1. Plugin System (GritQL)

You can now author custom lint rules using a pattern-based DSL called GritQL. For instance, a plugin can flag all uses of Object.assign() and suggest spread syntax instead next.biomejs.dev+5biomejs.dev+5news.ycombinator.com+5.

2. Domains

Lint rules are grouped into domains (framework/technology-specific groups), such as next, react, solid, and test. Biome auto-detects dependencies in your package.json to enable relevant domains by default github.com+10biomejs.dev+10segmentfault.com+10.

Example config:

json

"linter": {
  "domains": {
    "react": "recommended",
    "solid": "none"
  }
}

3. Multi‑file Analysis

Rules can now analyze across files—enabling checks like noImportCycles, noPrivateImports, and improved import-extension accuracy. This is powered by a new file-scanning pipeline, though it may introduce some performance overhead i-programmer.info+3biomejs.dev+3next.biomejs.dev+3.

4. Proof‑of‑Concept noFloatingPromises

Biome debuts a type-aware lint rule to catch unhandled promises—especially those without .catch() or await. It flags issues like:

js

asyncFunc().then(() => {});

Though currently limited to simple types and single-file analysis, it's a strong step toward safer, type-informed linting github.com+10biomejs.dev+10news.ycombinator.com+10.

5. Import Organizer Revamp

The import organizer merges** duplicates, enforces group sorting, and lets you define custom ordering (e.g., Node built-ins first, then internal packages, then externals) next.biomejs.dev+4biomejs.dev+4news.ycombinator.com+4.

6. Assists

“Biomes Assist” allows non‑diagnostic actions—such as sorting object keys or JSX attributes—without throwing lint errors i-programmer.info+4biomejs.dev+4news.ycombinator.com+4.

7. Enhanced Suppressions

You can suppress diagnostics flexibly:

8. Experimental HTML Formatter

For the first time, Biome ships an HTML formatter (preview). It formats .html files—respecting Prettier-like options—but doesn't yet support embedded markup in Vue/Svelte segmentfault.com+6biomejs.dev+6i-programmer.info+6.

🆕 New Lint Rules

The v2.0 beta introduces many built-in rules:

  • noAwaitInLoop

  • noBitwiseOperators

  • noDestructuredProps

  • noFloatingPromises

  • noImportCycles

  • noPrivateImports

  • noTsIgnore

  • noUnwantedPolyfillio

  • useConsistentObjectDefinition

  • useForComponent reddit.com+9biomejs.dev+9app.daily.dev+9

🔄 Breaking Changes & Cleanup

Biome 2.0 includes multiple breaking changes:

  • include and ignore replaced by includes

  • Style rules are no longer recommended by default

  • Several legacy/deprecated rules removed (e.g., noConsoleLog)

  • Removed older options including those referencing Rome

  • New config option: javascript.parser.jsxEverywhere

  • Monorepo enhancements: noUndeclaredDependencies now resolves based on local package.json

  • .editorconfig support enabled by default; JSON formatting aligned with package managers segmentfault.com+11biomejs.dev+11next.biomejs.dev+11

📣 Community & Feedback

The beta is now public and the team requests users to test and share feedback—especially regarding performance and correctness. Note that a few users have flagged slower builds or config migration quirks (e.g., beta.2 issues on certain OS setups) .

🎯 Why It Matters

  • Unified toolchain: Reinforces Biome’s mission as a one-stop engine for linting, formatting, bundling, and testing.

  • Type‑aware improvements: Lightweight type-informed linting without relying on tsc.

  • Customizability & UX: Plugins, domains, assists, and suppressions give fine-grained control.

  • HTML support: Opens the door to formatting web-based templating languages.

🧭 What to Do Next

If you're working in JavaScript/TypeScript:

  1. Try the beta via npm and run migrate.

  2. Activate plugin support and test GritQL.

  3. Experiment with domains and new lint rules.

  4. Enable the experimental HTML formatter.

  5. Share any slowdowns or bugs on the Biome repo to help stabilize the final release.

✅ In Summary

Biome v2.0 Beta is a major leap forward—embracing type-aware linting, cross-file analysis, plugin architecture, enhanced formatting, and a richer user experience. It demonstrates strong momentum toward replacing fragmented tools (ESLint, Prettier, etc.) with a unified, performant developer toolchain.

Let me know if you'd like a deep dive into any specific feature—such as plugin authoring, performance benchmarks, or migration strategies!

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