Issues

• Incremental builds miss diagnostics after UMD declaration changes

  BugDomain: tsc: --incremental
  microsoft/TypeScript#64967 · Filter by author Dunqing opened on Oct 26, 2026 · Backlog

• /** */ Style comments in code examples don't convert correctly

  Possible Improvement
  microsoft/TypeScript#64961 · Filter by author adligo opened on Oct 25, 2026 · Backlog

• Type annotations cause contextual this in object literal returned from an async function to be inferred as Promise<This> | This

  Bug
  microsoft/TypeScript#64954 · Filter by author kanashimia opened on Oct 25, 2026 · Backlog

• 7.1 regression: comparing a recursive -? mapped type is quadratic in the number of properties and hits TS2589 (since typescript-go#4820)

  Bug
  microsoft/TypeScript#64950 · Filter by author matej21 opened on Oct 24, 2026 · Backlog
  1

• Formatter README links rules.ts and names createRulesMap, which the Go port does not have

  Bug
  microsoft/TypeScript#64939 · Filter by author lgriffin opened on Oct 23, 2026 · Backlog

• Signature help shows no JSDoc for a const with a function type annotation

  BugDomain: LS: Signature Help
  microsoft/TypeScript#64937 · Filter by author andreww2012 opened on Oct 23, 2026 · Backlog
  1

• 7.1 regression: circular type alias accepts an assignment it should reject (opposite of #64891)

  Bug
  microsoft/TypeScript#64930 · Filter by author Nabil372 opened on Oct 22, 2026 · Backlog

• Excess synthetic-this member allocations in nongeneric mapped interface inheritance

  Domain: PerformancePossible Improvement
  microsoft/TypeScript#64925 · Filter by author 777genius opened on Oct 22, 2026 · Backlog

• API: parameter documentation (getDocumentationComment / getJsDocTags) diverges from the classic services in TypeScript 7.1

  BugDomain: API
  microsoft/TypeScript#64919 · Filter by author WinterYukky opened on Oct 22, 2026 · Backlog

• API: snapshot.update with both removePrograms and createPrograms crashes tsgo (nil dereference in ProjectCollectionBuilder.HandleAPIRequest)

  BugCrashDomain: API
  microsoft/TypeScript#64911 · Filter by author johnnyreilly opened on Oct 21, 2026 · Backlog

• JSDocTypeLiteral.jsdocPropertyTags returns only the first tag

  Bug
  microsoft/TypeScript#64899 · Filter by author mourner opened on Oct 21, 2026 · Backlog

• emitDecoratorMetadata emits a ReferenceError for a default import type from an unresolvable module

  Bug
  microsoft/TypeScript#64889 · Filter by author blickly opened on Oct 20, 2026 · Backlog
  1

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

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

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

  BugCrashDomain: tsc: --incremental
  microsoft/TypeScript#64875 · Filter by author YevheniiKotyrlo opened on Oct 19, 2026 · Backlog
  4

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

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

• Support Jujutsu conflict markers

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

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

  Domain: PerformancePossible Improvement
  microsoft/TypeScript#64848 · Filter by author turadg opened on Oct 16, 2026 · Backlog
  1

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

  BugDomain: tsc: --incrementalDomain: tsc -b
  microsoft/TypeScript#64838 · Filter by author jasonkuhrt opened on Oct 15, 2026 · Backlog
  1

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

  BugDomain: LS: Auto-import
  microsoft/TypeScript#64820 · Filter by author lsh4711 opened on Oct 14, 2026 · Backlog
  2

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

  BugCrashDomain: check: Control Flow
  microsoft/TypeScript#64813 · Filter by author YuanchengJiang opened on Oct 14, 2026 · Backlog

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

  BugDomain: Declaration Emit
  microsoft/TypeScript#64812 · Filter by author sindresorhus opened on Oct 14, 2026 · Backlog

• Language server (tsc --lsp) exits with code 1 after shutdown and exit

  Bug
  microsoft/TypeScript#64742 · Filter by author creasty opened on Oct 12, 2026 · Backlog
  1

• export * resolution allocates per re-exported name, slowing checks of barrels over large modules

  Possible Improvement
  microsoft/TypeScript#64719 · Filter by author gwkline opened on Oct 10, 2026 · Backlog

• Declaration emit renames value references when a shadowed type parameter shares its parameter's name

  Bug
  microsoft/TypeScript#64706 · Filter by author jasonkuhrt opened on Oct 9, 2026 · Backlog
  3

• False negative issues in function type parameters of ts2824

  Bug
  microsoft/TypeScript#64705 · Filter by author bvanjoi opened on Oct 9, 2026 · Backlog