Issues

• Escaped in / instanceof after a class field initializer is parsed as a binary operator instead of a new member

  microsoft/TypeScript#64883 · Filter by author JLHwung opened on Oct 20, 2026

• 7.1 regression: import resolving to a non-module file falls back to a pattern ambient module instead of TS2306

  microsoft/TypeScript#64882 · Filter by author harshmandan opened on Oct 20, 2026

• Incremental compile panics on a failed output write, or never retries it

  microsoft/TypeScript#64875 · Filter by author YevheniiKotyrlo opened on Oct 19, 2026
  4

• Some JS API types don't match their runtime values

  microsoft/TypeScript#64864 · Filter by author auvred opened on Oct 19, 2026

• Panic in getSignaturesOfType on a decorator's contextual type in JS API

  microsoft/TypeScript#64863 · Filter by author auvred opened on Oct 19, 2026

• TS7 LSP: every didOpen rebuilds and deletes a non-matching referenced project

  microsoft/TypeScript#64862 · Filter by author Kiborgik opened on Oct 19, 2026

• [api] No replacement for ts.transform / TransformationContext / custom transformers in program.emit

  microsoft/TypeScript#64861 · Filter by author Smrtnyk opened on Oct 19, 2026

• [api] Add back missing: factory.createUniqueName / createTempVariable (generated identifiers)

  microsoft/TypeScript#64860 · Filter by author Smrtnyk opened on Oct 19, 2026

• [API] Printer attaches source comments to synthesized nodes because the node encoder sends pos -1 as 0

  microsoft/TypeScript#64859 · Filter by author Smrtnyk opened on Oct 19, 2026

• "This expression is not callable." false positive on union of generic functions where the call is valid for all types in the union

  Design Limitation
  microsoft/TypeScript#64855 · Filter by author DetachHead opened on Oct 18, 2026
  2

• Support Jujutsu conflict markers

  microsoft/TypeScript#64852 · Filter by author rf- opened on Oct 17, 2026
  1

• [ServerErrors][TypeScript] main

  microsoft/TypeScript#64851 · Filter by author typescript-automation opened on Oct 17, 2026
  3

• [ServerErrors][JavaScript] main

  microsoft/TypeScript#64849 · Filter by author typescript-automation opened on Oct 16, 2026
  6

• TypeScript 7.1 regression: quadratic root scanning in settled no-op builds

  microsoft/TypeScript#64848 · Filter by author turadg opened on Oct 16, 2026
  1

• Incremental tsc --build reports a different result from a clean build after a change to package.json dependencies

  microsoft/TypeScript#64838 · Filter by author jasonkuhrt opened on Oct 15, 2026
  1

• tsc -b can hang when two referenced projects extend into one circular extends chain

  Bug
  microsoft/TypeScript#64833 · Filter by author cplieger opened on Oct 15, 2026
  

• Content mappers: go-to-definition on an module specifier returns nothing when the target file has more than one span-map segment

  Needs Investigation
  microsoft/TypeScript#64828 · Filter by author NullVoxPopuli opened on Oct 15, 2026 · TypeScript 7.1.1 RC
  1

  

• Support package maps

  microsoft/TypeScript#64827 · Filter by author arcanis opened on Oct 15, 2026

• [api] createSnapshot panics opening a project that extends into a circular extends chain

  microsoft/TypeScript#64824 · Filter by author cplieger opened on Oct 15, 2026

• Changing importModuleSpecifier or importModuleSpecifierEnding does not update auto-import specifiers in open files

  microsoft/TypeScript#64820 · Filter by author lsh4711 opened on Oct 14, 2026
  2

• Crash: Unhandled case in resolveStructuredTypeMembers when switching on an evolving [] array inside a loop

  microsoft/TypeScript#64813 · Filter by author YuanchengJiang opened on Oct 14, 2026

• Declaration emit cannot name an exported unique symbol property key unless the file already imports it

  microsoft/TypeScript#64812 · Filter by author sindresorhus opened on Oct 14, 2026

• Native LSP watcher shutdown races subscription publication and panics on a nil map

  microsoft/TypeScript#64810 · Filter by author vizanto opened on Oct 14, 2026

• === narrowing of a primitive union now produces a non-widening literal type (regression from microsoft/typescript-go#4781)

  Bug
  microsoft/TypeScript#64766 · Filter by author sophiebits opened on Oct 13, 2026 · TypeScript 7.1.1 RC

• Declaration emit writes = Infinity initializers for overflowing number literals (invalid .d.ts, TS1254)

  Bug
  microsoft/TypeScript#64760 · Filter by author sidcraftscode opened on Oct 13, 2026