TypeScript 5.6.0

Issues

• Crashes on transform and parse (from assertion/debug failures)

  BugCrashDomain: API: TransformsEffort: CasualHelp Wanted
  microsoft/TypeScript#58924 · Filter by author Roise-yue opened on Jun 19, 2024 · TypeScript 5.6.0
  5

  

• When relatively importing a .d.ts file in a declaration file, TypeScript loads a .ts file instead

  Needs Investigation
  microsoft/TypeScript#58353 · Filter by author lucacasonato opened on Apr 29, 2024 · TypeScript 5.6.0
  8

  

• Defer TransformFlags Calculation

  Domain: PerformanceExperimentation NeededSuggestion
  microsoft/TypeScript#58395 · Filter by author DanielRosenwasser opened on May 1, 2024 · TypeScript 5.6.0
  2

• Reachability analysis of never for yield* is unchecked

  Needs Investigation
  microsoft/TypeScript#58582 · Filter by author rixtox opened on May 20, 2024 · TypeScript 5.6.0
  2

  

• TypeScript emits d.ts file that is invalid for complex mapped type.

  BugDomain: Declaration Emit
  microsoft/TypeScript#58688 · Filter by author CraigMacomber opened on May 29, 2024 · TypeScript 5.6.0
  

• Bad error when using import() type within JSDoc tag @implements

  BugDomain: JSDoc
  microsoft/TypeScript#58542 · Filter by author jaydenseric opened on May 15, 2024 · TypeScript 5.6.0
  2

  

• Compiler cannot handle promise.then(null | undefined)

  Needs Investigation
  microsoft/TypeScript#58619 · Filter by author blackdyedsheep opened on May 22, 2024 · TypeScript 5.6.0
  8

  

• "The inferred type of X cannot be named without a reference to Y" (TS2742) still happens, when working with npm link to link packages manually

  Experience EnhancementNeeds Investigation
  microsoft/TypeScript#58914 · Filter by author Teascade opened on Jun 18, 2024 · TypeScript 5.6.0
  19

  

• Typescript 5.5 performance regression on arktype

  BugDomain: Performance
  microsoft/TypeScript#58805 · Filter by author DanielRosenwasser opened on Jun 7, 2024 · TypeScript 5.6.0
  2

• Incorrect class #private fields initialization order with target ES2022 and useDefineForClassFields set to false

  Needs Investigation
  microsoft/TypeScript#54206 · Filter by author Michsior14 opened on May 10, 2023 · TypeScript 5.6.0
  14

  

• Investigate Wildcard Matching Performance

  Domain: PerformanceSuggestion
  microsoft/TypeScript#59058 · Filter by author DanielRosenwasser opened on Jun 27, 2024 · TypeScript 5.6.0
  2