Issues

• Conditional type unexpectedly non-distributive with never

  Bug
  microsoft/TypeScript#57343 · by Filter by author rotu was closed on Feb 9, 2024 · TypeScript 5.4.0
  1

  

• Inconsistent intersections of string literal types and pattern string mapping types

  BugFix Available
  microsoft/TypeScript#57192 · by Filter by author ahejlsberg was closed on Jan 28, 2024 · TypeScript 5.4.0
  

• Unflagged used before its declaration for const enum when isolatedModules is enabled

  BugFix Available
  microsoft/TypeScript#57173 · by Filter by author frigus02 was closed on Jan 30, 2024 · TypeScript 5.4.0
  

• 5.4 breaks @types/node when using isolatedModules

  BugFix Available
  microsoft/TypeScript#57136 · by Filter by author nicolo-ribaudo was closed on Jan 24, 2024 · TypeScript 5.4.0
  

• ClassFieldDecoratorContext has addInitializer method which is not part of the spec.

  Working as Intended
  microsoft/TypeScript#57096 · by Filter by author phiresky was closed on Jan 19, 2024 · TypeScript 5.4.0
  4

  

• Revise mapped tuple type instantiation logic

  Author: TeamFor Milestone Bug
  Unread
  microsoft/TypeScript#57031·by ahejlsberg was merged Oct 16, 2025
  34

  

• Incremental compile can spend time type checking files with @ts-nocheck

  Fix AvailableNeeds Investigation
  microsoft/TypeScript#56956 · by Filter by author wnayes was closed on May 21, 2024 · TypeScript 5.4.0
  1

  

• Bundler module resolution fails to resolve colocated declaration file

  Fix AvailableNeeds Investigation
  microsoft/TypeScript#56933 · by Filter by author Methuselah96 was closed on Feb 2, 2024 · TypeScript 5.4.0
  2

  

• Path completions with wildcard "exports" drop necessary file extensions

  BugDomain: LS: Completion ListsFix Available
  microsoft/TypeScript#56929 · by Filter by author andrewbranch was closed on Feb 7, 2024 · TypeScript 5.4.0
  1

  

• Preserve type refinements in closures created past last assignment

  Author: TeamFor Backlog Bug
  Unread
  microsoft/TypeScript#56908·by ahejlsberg was merged Oct 16, 2025
  82

  

• Readonly<[...unknown[], infer L]> and readonly [...unknown[], infer L] exhibit inconsistent behavior.

  BugFix Available
  microsoft/TypeScript#56888 · by Filter by author 13OnTheCode was closed on Jan 19, 2024 · TypeScript 5.4.0
  7

  

• [API] getImpliedNodeFormatForFile can't be used because the first argument is of an internal type

  BugDomain: APIFix Available
  microsoft/TypeScript#56852 · by Filter by author ericmorand was closed on Jan 3, 2024 · TypeScript 5.4.0
  1

  

• typescript.preferences.preferTypeOnlyAutoImports not working with TypeScript 5.3?

  Needs Investigation
  microsoft/TypeScript#56832 · by Filter by author johnnyreilly was closed on Jan 3, 2024 · TypeScript 5.4.0
  3

  

• unique symbol type annotation not respected in JS

  BugDomain: JSDocFix Available
  microsoft/TypeScript#56800 · by Filter by author sandersn was closed on Jan 2, 2024 · TypeScript 5.4.0
  1

  

• Add NoInfer<T> intrinsic represented as special substitution type

  Author: TeamFor Uncommitted Bug
  Unread
  microsoft/TypeScript#56794·by ahejlsberg was merged Oct 16, 2025
  56

  

• Exported const type parameters is not renamed in constraint in another const in type declarations

  BugDomain: Declaration EmitFixed
  microsoft/TypeScript#56783 · by Filter by author mcheshkov was closed on Sep 19, 2026 · TypeScript 5.4.0
  5

  

• Ignore non-ts/js files in move to file refactor

  7.0 LS MigrationBugDomain: LS: Refactorings
  microsoft/TypeScript#56749 · by Filter by author jasonlyu123 was closed on Dec 3, 2025 · TypeScript 5.4.0
  9

  

• unique symbol quick info is different in JS than TS

  BugFix Available
  microsoft/TypeScript#56737 · by Filter by author sandersn was closed on Jan 2, 2024 · TypeScript 5.4.0
  3

  

• Unique Symbol resolution with JSDoc

  Domain: JSDocNeeds Investigation
  microsoft/TypeScript#56757 · by Filter by author 8HoLoN was closed on Dec 15, 2023 · TypeScript 5.4.0
  10

  

• Non-homomorphic instantiation of a homomorphic mapped type is not spreadable when it has an array constraint

  BugFix Available
  microsoft/TypeScript#56726 · by Filter by author Andarist was closed on Feb 19, 2024 · TypeScript 5.4.0
  

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

  BugFix Available
  microsoft/TypeScript#56718 · by Filter by author CraigMacomber was closed on Jan 9, 2024 · TypeScript 5.4.0
  

• No error when referencing a value that was re-exported with export type *

  BugFix Available
  microsoft/TypeScript#56648 · by Filter by author Oblosys was closed on Jan 31, 2024 · TypeScript 5.4.0
  1

  

• Support for "const modifier on type parameters" with JSDoc

  Fix AvailableNeeds Investigation
  microsoft/TypeScript#56634 · by Filter by author leibale was closed on Dec 15, 2023 · TypeScript 5.4.0
  6

  

• Declaration emit fails to import symbol on function auto-property

  BugDomain: Declaration EmitFixed
  microsoft/TypeScript#56630 · by Filter by author webstrand was closed on Sep 19, 2026 · TypeScript 5.4.0
  1

  

• Index signatures not supported in inlay hints

  BugDomain: LS: Inlay HintsFixedOld-Crawler-Detected
  microsoft/TypeScript#56605 · by Filter by author DanielRosenwasser was closed on Nov 29, 2023 · TypeScript 5.4.0
  2