Changelog

microsoft/typescript-go · · 21 commits

Filesystem watcher lands, plus key fixes

Major fswatch addition and a cluster of compiler/emit fixes across JSX, async super, metadata, and tsconfig parsing.

ahejlsberg jakebailey a-tarasyuk

fswatch package added with cross-OS CI (jakebaileyc0b4c4e) A new internal/fswatch package was ported in with support code, tests, docs, and workflow plumbing to run it on BSD variants in CI. This is a substantial new subsystem for file watching and a big step toward more robust watch-mode behavior.

Decorator metadata now falls back for BigInt below ES2020 (433bc1e) emitDecoratorMetadata now emits a runtime-safe BigInt fallback when targeting pre-ES2020 instead of always assuming BigInt exists. That fixes invalid output for older targets and makes decorator metadata emission safer across more compile targets.

Async super handling fixed in default parameters (bef4582) Downlevel async transform now correctly preserves and rewrites super references that appear in default parameter initializers, including inside async arrow functions. This closes a real emit bug that could generate incorrect code for inheritance-heavy async patterns.

Expando property flow analysis now reaches function expressions (ahejlsberge5f8968) Control-flow analysis was extended so dotted-name assignments on function expressions and arrows are treated like expandos instead of stopping at the variable declaration. That improves narrowing and fixes false results in scenarios involving function-valued objects with assigned properties.

tsconfig include validation now rejects **/../ patterns (40f6707) Parsing now reports the parent-traversal-after-recursive-wildcard error for include specs like **/../*.ts, matching expected tsconfig rules. The fix also avoids crashing when attaching diagnostics to missing JSON array elements.

Syntactic errors now suppress follow-on option diagnostics (306f69d) GetDiagnosticsOfAnyProgram now stops after syntactic diagnostics when errors are already present, instead of piling on unrelated option/global/semantic diagnostics. This makes tsc output cleaner and closer to expected behavior in broken files.

Other misc changes

  • JSX uppercase hex entities now match tsc behavior (2e3f36b)
  • Auto-accessor type resolution fix (ahejlsberg95a42cf)
  • JSDoc from contextual type used in hover when available (ahejlsberg6c88330)
  • CommonJS shorthand destructuring rewrite fix (90c540a)
  • Incompatible function type diagnostics now use tuple labels for parameter names (336f59c)
  • Namespace imports elided when only used by type-only export aliases (c4cf203)
  • Enum member emit fixed for escaped identifiers (244cda9)
  • Null enum values handled in tsconfig parsing (9874733)
  • Async arrow this capture fixed in static field emit (109f18b)
  • import.defer preserved in CommonJS emit (a-tarasyuk503ea95)
  • macOS F_GETPATH realpath fix (jakebailey704847d)
  • Format selection no longer deletes comments when selection ends in trivia (eb6de00)
  • VS-prefixed type naming cleanup across LSP/LS internals (jakebailey9a48038)