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- #63703 · DanielRosenwasser opened
on Jul 31, 2026 2 - #63085 · DanielRosenwasser opened
on Feb 3, 2026 42 - #62963 · RyanCavanaugh opened
on Jan 8, 2026 7
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- Status: Open.#63721 In microsoft/TypeScript;
- Status: Open.#63719 In microsoft/TypeScript;
- Status: Open.#63718 In microsoft/TypeScript;
Implicitly typed type guard does not guard
DuplicateAn existing issue was already createdAn existing issue was already createdStatus: Open.#63715 In microsoft/TypeScript;Typescript still checks return type in a lamba that calls a function returning 'never'
Design LimitationConstraints of the existing architecture prevent this from being fixedConstraints of the existing architecture prevent this from being fixedStatus: Open.#63714 In microsoft/TypeScript;Exported namespace class suppresses TS1308 for await in computed member names
BugA bug in TypeScriptA bug in TypeScriptStatus: Open.ReadonlyMaplacks documentation forforEach,get,hasandsizeDomain: lib.d.tsThe issue relates to the different libraries shipped with TypeScriptThe issue relates to the different libraries shipped with TypeScriptPossible ImprovementThe current behavior isn't wrong, but it's possible to see that it might be better in some casesThe current behavior isn't wrong, but it's possible to see that it might be better in some casesStatus: Open.Property lookups on arguments to type parameters constrained by string index signatures can violate other constraints because undefined is included for optional properties
Cursed?It's likely this is extremely difficult to fix without making something else much, much worseIt's likely this is extremely difficult to fix without making something else much, much worseFix AvailableA PR has been opened for this issueA PR has been opened for this issuePossible ImprovementThe current behavior isn't wrong, but it's possible to see that it might be better in some casesThe current behavior isn't wrong, but it's possible to see that it might be better in some casesStatus: Open.It is possible to violate generic constraints when distributing union types
Needs InvestigationThis issue needs a team member to investigate its status.This issue needs a team member to investigate its status.Status: Open.#63708 In microsoft/TypeScript;Add
es2026as validtargetandlibCommittedThe team has roadmapped this issueThe team has roadmapped this issueDomain: lib.d.tsThe issue relates to the different libraries shipped with TypeScriptThe issue relates to the different libraries shipped with TypeScriptES NextNew featurers for ECMAScript (a.k.a. ESNext)New featurers for ECMAScript (a.k.a. ESNext)SuggestionAn idea for TypeScriptAn idea for TypeScriptStatus: Open.#63704 In microsoft/TypeScript;TypeScript 7.1 Iteration Plan
PlanningIteration plans and roadmappingIteration plans and roadmappingStatus: Open.#63703 In microsoft/TypeScript;lib.d.tsUpdates for TypeScript 7.1BugA bug in TypeScriptA bug in TypeScriptDomain: lib.d.tsThe issue relates to the different libraries shipped with TypeScriptThe issue relates to the different libraries shipped with TypeScriptStatus: Open.#63702 In microsoft/TypeScript;