Formatter and parser coverage expanded a lot
Biome spent most of the month widening language support and fixing long-standing formatting edge cases. Markdown saw the biggest churn, with multiple parser/formatter refactors, prose wrapping, better list/blockquote/code handling, and improved CommonMark compatibility. YAML also got major attention: flow mappings, block scalars, document markers, directives, explicit entries, quote normalization, and comment placement all became more robust. CSS/SCSS and HTML/Svelte/Vue/Astro templates likewise picked up many correctness fixes, including SCSS-only syntax gating, selector/comment placement fixes, verbatim whitespace handling, Angular and Svelte declaration tag support, and more reliable embedded-node parsing.
Type-aware linting and inference were substantially overhauled
July was a big month for Biome’s typed analysis stack. A new Salsa-based inference engine landed, followed by multiple refactors to module graphs, globals, raw type collection, structural mapping, and import-cycle handling. These changes also improved performance and reduced false positives/negatives in rules like noMisusedPromises, noFloatingPromises, useAwaitThenable, useNullishCoalescing, noMisleadingReturnType, noUnnecessaryConditions, and noUnresolvedImports. Several rules gained broader real-world coverage for overloads, tuple spreads, aliased generics, TypeScript wrappers, and incomplete inference results.
LSP, daemon, and workspace stability got a lot better
There were several high-impact editor/runtime fixes: a workspace/LSP deadlock was resolved, the daemon proxy was hardened so one disconnected client no longer kills shared service sessions, stale Unix sockets are now cleaned up on startup, and workspace/database plumbing was refactored for better correctness. Biome also improved on-type formatting behavior, aligned trigger characters, and made CLI/server workspace writes more stateless to avoid lockups during server-backed formatting and linting.
New rules and rule options broadened linting
The lint surface grew with noNegationInEqualityCheck, noRestrictedProperties, and noTailwindArbitraryValue, plus new options for existing rules like useNullishCoalescing, useDomQuerySelector, and noProcessEnv. Several HTML accessibility rules were updated to understand dynamic/shorthand attributes across Vue, Svelte, Astro, and Angular, which cut down false positives in template-heavy codebases. Tailwind class sorting also got smarter, especially around v4 signatures, functional utilities, and important/negative variants.
Performance and CLI output improved
Formatter performance was trimmed with faster width calculation and printer hot-path inlining, and HTML linting got faster by switching to tag-kind matching. Profiling output became more useful with plugin-name split timings and a dedicated inference profiler. The CLI’s rdjson output now includes explicit severities, --stdin-file-path respects nested config more reliably, and help/reporter docs were polished for clarity.
Other misc changes
Release automation, dependency bumps, snapshot refreshes, benchmark plumbing, and assorted small bug fixes across CSS, HTML, Markdown, Svelte, Vue, and YAML.