CSS and HTML capabilities expanded
Biome added end-to-end support for CSS @custom-media, including parsing, formatting, linting, and AST updates. HTML also got a meaningful boost with Angular attribute parsing/formatting, Vue shorthand stability fixes, better HTML/SVG tag handling, and a few a11y refinements.
Type inference and promise/lint accuracy improved
A large share of the week focused on Salsa/type-aware infrastructure. Biome hardened inference across overloads, aliases, default namespace imports, and cross-module cases, which fed directly into better diagnostics for rules like noMisusedPromises, noFloatingPromises, noUnnecessaryConditions, and useIncludes.
Formatter and parser bugs were fixed in several languages
The formatter now keeps comments in the right place for on-type formatting, CSS declarations before !important, and partial-document cases. Markdown block quotes, Vue parsing, and a handful of HTML/CSS edge cases were also corrected to avoid crashes and misformatted output.
New and updated lint behavior
Biome introduced noNegationInEqualityCheck to catch precedence bugs like !foo === bar, and rewrote noThenProperty for both speed and better token/comment handling. Several existing type-aware rules were migrated onto newer inference APIs, improving consistency while preserving coverage through added tests.
CLI, workspace, and internal cleanup
process_file was refactored to work statelessly with workspace writes and avoid a type-aware deadlock risk, while workspace sync and logging were hardened. The codebase also saw internal API cleanup (Text -> TokenText), resolver improvements, and various dependency/workflow updates.
Other misc changes
- Dependency bumps and lockfile refreshes across the week.
- Snapshot, docs, and changeset updates for the new parser/lint behavior.
- Minor release automation, test, and tooling maintenance.