biome linting formatting javascript tooling

Biome v1 ships formatter options and lint command

JSX quote styles, arrow function parentheses control, and a dedicated `biome lint` command reduce formatter noise and configuration boilerplate.

June 9, 2026

Summary

Splitting lint from format operations lets you run lighter checks in CI pipelines. New formatter options eliminate quote/paren style debates without third-party plugins. Configuration composition via `extends` scales multi-team setups.

Why it matters

Implementation verdict

Replaces prettier configuration for quote/paren handling in JavaScript projects. Requires `npm install --save-exact @biomejs/biome@1.0.0`. Worth adopting now if you're already on Biome; migration cost is low (config file updates). Breaking CLI changes require reading changelog before upgrade.

Sources

1.support for formatting the preferred quote kind in JSX
2.support for formatting parenthesis in arrow functions only when they are needed
3.The command biome check will now emit error diagnostics for code not formatted and exits with an error code
4.With biome lint, Biome will only run lint rules against files
5.You can now break down your configuration file into different files and join them using the new extends property

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