Issues

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

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

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

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

• augmentExportEquals2 fixture has a duplicate @filename directive

  microsoft/TypeScript#64927 · Filter by author mahesh-desu opened on Oct 22, 2026

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

  microsoft/TypeScript#64925 · Filter by author 777genius opened on Oct 22, 2026

• [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

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

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

  microsoft/TypeScript#64917 · Filter by author DetachHead opened on Oct 22, 2026

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

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

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

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

• JSDocTypeLiteral.jsdocPropertyTags returns only the first tag

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

• panic: Unhandled case in Node.MemberList: KindVariableDeclarationList on merged namespace/enum element access

  Bug
  microsoft/TypeScript#64895 · Filter by author muh-syaipullah opened on Oct 21, 2026
  1

• [7.1 Regression] Unexpected behaviour change from Stronger Distributive Type checks

  Needs Investigation
  microsoft/TypeScript#64892 · Filter by author hkleungai opened on Oct 21, 2026
  

• 7.1 regression: declaration order of recursive generic interfaces changes assignability (TS2322)

  Needs Investigation
  microsoft/TypeScript#64891 · Filter by author chrisolszewski opened on Oct 21, 2026
  1

  

• 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

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

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

• 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

• 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

  Bug
  microsoft/TypeScript#64863 · Filter by author auvred opened on Oct 19, 2026 · TypeScript 7.1.1 RC
  

• 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

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

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

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

  Needs Investigation
  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

  Bug
  microsoft/TypeScript#64859 · Filter by author Smrtnyk opened on Oct 19, 2026 · TypeScript 7.1.1 RC
  

• Support Jujutsu conflict markers

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

• [ServerErrors][TypeScript] main

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