Issues

• ts2322 incorrectly triggered when importing json

  Duplicate
  microsoft/TypeScript#58734 · by Filter by author MarByteBeep was closed on Jun 16, 2024
  9

• Analyze control flow effects of lambdas passed as arguments

  Author: TeamFor Uncommitted Bug
  Unread
  microsoft/TypeScript#58729·by ahejlsberg was closed Mar 24, 2026
  114

  

• Tuple Restriction Issue: Inconsistent Behavior with Array Methods

  Duplicate
  microsoft/TypeScript#58701 · by Filter by author srosama was closed on Jun 1, 2024
  2

• Mapped types doesn't map the key value for methods when mapping over a generic instantiated with an array

  microsoft/TypeScript#58694 · by Filter by author nicolo-ribaudo was closed on May 29, 2024
  5

• [isolatedDeclarations][5.5] Adding satisfies to a const expression makes it require explicit type annotation

  microsoft/TypeScript#58397 · by Filter by author MichaelMitchell-at was closed on May 2, 2024
  11

• TS2590: Expression produces a union type that is too complex to represent, with simple file using Tuples

  Domain: check: Big UnionsHelp WantedPossible Improvement
  microsoft/TypeScript#58268 · Filter by author ehmicky opened on Apr 21, 2024 · Backlog
  7

• Add Support for Flow's new component syntax

  In DiscussionSuggestion
  microsoft/TypeScript#58246 · Filter by author bruno-gregorio opened on Apr 19, 2024
  9

• Add numeric constraint to type parameter of mapped types with name type and array constraints (take 2)

  For Backlog Bug
  Unread
  microsoft/TypeScript#58237·by Andarist was closed May 1, 2024
  4

• Allow non-polymorphic ("private") extension of base classes

  Awaiting More FeedbackSuggestion
  microsoft/TypeScript#57979 · Filter by author dmchurch opened on Mar 28, 2024
  5

• TypeScript cannot deduce decomposed array type.

  Design Limitation
  microsoft/TypeScript#57904 · by Filter by author jrandolf-old was closed on Mar 22, 2024
  13

• Regression 5.4: the new conditional type constraint is not working with a type parameter representing union type

  Working as Intended
  microsoft/TypeScript#57864 · by Filter by author Alexsey was closed on Mar 23, 2024
  5

• Regression when spreading Types in an Alias: TS1265: A rest element cannot follow another rest element.

  Working as Intended
  microsoft/TypeScript#57828 · by Filter by author pfeileon was closed on Mar 22, 2024
  4

• Distribute mapped types over array/tuple intersections

  Author: TeamFor Uncommitted Bug
  Unread
  microsoft/TypeScript#57801·by ahejlsberg was merged Mar 18, 2024
  9

  

• Option strictMethodType: strictFunctionType for method syntax.

  microsoft/TypeScript#57783 · by Filter by author Conaclos was closed on Mar 15, 2024
  13

• as const does not always narrow array literals to tuple types

  Not a Defect
  microsoft/TypeScript#57727 · by Filter by author jflatow was closed on Mar 15, 2024
  5

• Generic conditional type prematurely resolves to one of the branches instead of deferring

  Needs Investigation
  microsoft/TypeScript#57650 · Filter by author jcalz opened on Mar 5, 2024
  6

  

• Improve best type matching for elementwise elaborations

  For Backlog Bug
  Unread
  microsoft/TypeScript#57537·by Andarist was closed Mar 24, 2026
  22

  

• [ID-Prep] PR2 - Preserve all type triple slash references

  Breaking ChangeFor Backlog Bug
  Unread
  microsoft/TypeScript#57440·by dragomirtitian was closed Mar 8, 2024
  15

  

• Empty array literals without contextual type can lead to unsound index accesses

  Working as Intended
  microsoft/TypeScript#57419 · by Filter by author Andarist was closed on Feb 16, 2024
  11

• Issue deriving tuple types on overridden method

  Not a Defect
  microsoft/TypeScript#57387 · by Filter by author pvande was closed on Feb 17, 2024
  10

• Union type to "unordered" array

  DeclinedSuggestion
  microsoft/TypeScript#57321 · by Filter by author molinch was closed on Feb 8, 2024
  6

• Permit circular references in type arguments for object type aliases

  Author: TeamFor Uncommitted Bug
  Unread
  microsoft/TypeScript#57293·by ahejlsberg was closed Mar 24, 2026
  25

  

• New syntax: (x: X) => mutates x to Y, similar to asserts x as Y but not only narrowing

  Duplicate
  microsoft/TypeScript#57273 · by Filter by author krryan was closed on Feb 5, 2024
  4

• mapped type with remapped keys unexpectedly widens type

  Has ReproNeeds Investigation
  microsoft/TypeScript#57265 · Filter by author rotu opened on Feb 1, 2024
  12

  

• ${string}${string} turns into string

  Not a Defect
  microsoft/TypeScript#57233 · by Filter by author nomadshiba was closed on Feb 5, 2024
  17