Issues

• --experimentalDecorators: decorated abstract property is emitted as a class field (regression in 7.0)

  microsoft/TypeScript#64980 · Filter by author simleb opened on Oct 27, 2026

• Missing namespace qualifier in import = emit across merged namespaces

  microsoft/TypeScript#64975 · Filter by author magic-akari opened on Oct 27, 2026

• 7.1: destructured parameter with a = {} default loses its contextual type (TS7031)

  microsoft/TypeScript#64974 · Filter by author raimonade opened on Oct 26, 2026
  1

• 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

• Preserve narrowing in closures for imports that resolve to const variables

  Suggestion
  microsoft/TypeScript#64959 · Filter by author mcmimik opened on Oct 25, 2026

• type Exclude on class hierarchy resolves to never

  Question
  microsoft/TypeScript#64957 · Filter by author xtnw opened on Oct 25, 2026
  4

• 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

• Unsaved export not offered for auto-import after reopening the importing file

  Bug
  microsoft/TypeScript#64953 · Filter by author johnsoncodehk 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

• Stack overflow in getEffectsSignature for long comma-separated call chains (e.g. minified bundles with allowJs)

  Won't Fix
  microsoft/TypeScript#64948 · Filter by author u9g opened on Oct 24, 2026
  4

• [ServerErrors][JavaScript] main

  Needs Investigation
  microsoft/TypeScript#64947 · Filter by author typescript-automation opened on Oct 23, 2026
  4

• File changed on disk with a content-mapped or .d.ts extension never triggers workspace/diagnostic/refresh

  microsoft/TypeScript#64943 · Filter by author mrlubos opened on Oct 23, 2026

• 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

• Defining a type with inferred generic parameters

  Suggestion
  microsoft/TypeScript#64938 · Filter by author denis-migdal opened on Oct 23, 2026
  2

• 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

• Allow content mappers emit diagnostics with different severity levels

  Suggestion
  microsoft/TypeScript#64932 · Filter by author blt-r opened on Oct 23, 2026
  2

• 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

• Native token lookup allocates a visitor on each AST descent step

  Possible Improvement
  microsoft/TypeScript#64929 · Filter by author Tom4ikss opened on Oct 22, 2026 · Backlog

• augmentExportEquals2 fixture has a duplicate @filename directive

  Bug
  microsoft/TypeScript#64927 · Filter by author mahesh-desu 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

• [7.1 API] Equivalent of BuilderProgram.getAllDependencies / batched module resolution

  microsoft/TypeScript#64920 · Filter by author nicojs opened on Oct 22, 2026

• 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

• "Content mapper file extension '.const.json' is a built-in extension and cannot be registered by a content mapper." error is misleading

  Domain: Error MessagesPossible Improvement
  microsoft/TypeScript#64917 · Filter by author DetachHead opened on Oct 22, 2026 · Backlog

• Content mappers: pass an import's query or attributes to transform

  Needs Investigation
  microsoft/TypeScript#64912 · Filter by author colinhacks opened on Oct 21, 2026