Type system and declaration lowering got much deeper
Big expansion in generated global types and lowering — Biome substantially widened its type model, adding support for indexed access types, keyof in generic operands, predefined types with generics, generic constructors, function/overloaded call signatures, Array.from, RegExp, builtin constructors, Iterable, Math, and readonly/const-generic inference. This should improve exhaustiveness, builtin understanding, and downstream analysis precision across the JS/TS ecosystem.
Resolver and language-server workflows improved
Workspace resolution and file watching became more robust — The resolver was reworked to use salsa-backed inputs so manifest and path-mapping changes stay in sync in long-running workspaces without touching importing files. In parallel, the LSP now scopes file watchers per workspace folder and falls back safely for older clients, tightening incremental behavior in multi-root setups.
Parser, analyzer, and suppression handling were hardened
Several correctness bugs in parsing and embedded analysis were fixed — Biome now handles suppression comments more accurately in YAML, HTML-ish snippets, JavaScript embeddings, and Svelte blocks. It also fixed tricky TypeScript parsing around <</instantiation expressions and corrected HTML regex lexing, reducing false parse errors and making ignores behave where developers expect them.
Linting and autofix behavior became more trustworthy
Multiple rules were refined or added — New nursery rules landed for Tailwind raw colors, logical CSS properties, and meaningless void usage. Existing rules were tightened for self-recursive arrow functions, focused-test detection, negative-index handling, for...of suggestions, infinite truthy loops, and frame-sizing, while config handling was corrected so disabled domains and invalid config files no longer hide expected diagnostics.
Formatter and CLI fixes cleaned up edge cases
Formatter and CLI output got a round of polish — Fixes landed for YAML suppression placement, Svelte block comments, GritQL spacing, plugin load error reporting, and noOctalEscape/string-concat autofixes so rewrites preserve code meaning and diagnostics are easier to act on.
Other misc changes
- Added benchmarks and fixtures for complex module-graph/type-inference workloads
- Updated tests, snapshots, and internal analyzer plumbing throughout the week
- Misc dependency, docs, and release-note maintenance