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Destructuring all but one key dynamically via rest creates an unusable type by omitting all of its keys

Domain: Mapped TypesThe issue relates to mapped typesThe issue relates to mapped types

Experimentation NeededSomeone needs to try this out to see what happensSomeone needs to try this out to see what happens

Possible 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 cases

Status: Open.

#62572 In microsoft/TypeScript;

· branson-dyer opened on Oct 9, 2025

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Backlog

Suggestion: Derive disposability checks from known symbols rather than global interfaces

Experimentation NeededSomeone needs to try this out to see what happensSomeone needs to try this out to see what happens

SuggestionAn idea for TypeScriptAn idea for TypeScript

Status: Open.

#62121 In microsoft/TypeScript;

· Renegade334 opened on Jul 24, 2025

Tuples: maintaining type-param in the type of it's items

Experimentation NeededSomeone needs to try this out to see what happensSomeone needs to try this out to see what happens

SuggestionAn idea for TypeScriptAn idea for TypeScript

Status: Open.

#61750 In microsoft/TypeScript;

· eranhirsch opened on May 22, 2025

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Backlog

Performance degrades the more wildcards that are contained in TSConfig include or exclude patterns

Domain: PerformanceReports of unusually slow behaviorReports of unusually slow behavior

Experimentation NeededSomeone needs to try this out to see what happensSomeone needs to try this out to see what happens

Possible 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 cases

Status: Open.

#61103 In microsoft/TypeScript;

· MichaelMitchell-at opened on Feb 3, 2025

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Backlog

Giving an error type to types that have failed to resolve, instead of any

Experimentation NeededSomeone needs to try this out to see what happensSomeone needs to try this out to see what happens

SuggestionAn idea for TypeScriptAn idea for TypeScript

Status: Open.

#61089 In microsoft/TypeScript;

· RobertSandiford opened on Jan 31, 2025

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Backlog

Writes to indexed access of an index signature are not sufficiently constrained

Experimentation NeededSomeone needs to try this out to see what happensSomeone needs to try this out to see what happens

SuggestionAn idea for TypeScriptAn idea for TypeScript

Status: Open.

#60703 In microsoft/TypeScript;

· mkantor opened on Dec 6, 2024

Inconsistent narrowing of adjacently tagged unions

Experimentation NeededSomeone needs to try this out to see what happensSomeone needs to try this out to see what happens

SuggestionAn idea for TypeScriptAn idea for TypeScript

Status: Open.

#60685 In microsoft/TypeScript;

· kossnocorp opened on Dec 4, 2024

Syntactic checks against comparing to null/undefined in strictNullChecks mode

Experimentation NeededSomeone needs to try this out to see what happensSomeone needs to try this out to see what happens

SuggestionAn idea for TypeScriptAn idea for TypeScript

Status: Open.

#60425 In microsoft/TypeScript;

· lauraharker opened on Nov 5, 2024

ScriptKind.Deferred treated as LanguageVariant.Standard

Experimentation NeededSomeone needs to try this out to see what happensSomeone needs to try this out to see what happens

SuggestionAn idea for TypeScriptAn idea for TypeScript

Status: Open.

#60125 In microsoft/TypeScript;

· blake-newman opened on Oct 3, 2024

Proposal: Allow isolated declarations to infer results of constructor calls

Experimentation NeededSomeone needs to try this out to see what happensSomeone needs to try this out to see what happens

SuggestionAn idea for TypeScriptAn idea for TypeScript

Status: Open.

#60010 In microsoft/TypeScript;

· MichaelMitchell-at opened on Sep 19, 2024

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Backlog

Inline *_base declaration in d.ts files

Experimentation NeededSomeone needs to try this out to see what happensSomeone needs to try this out to see what happens

SuggestionAn idea for TypeScriptAn idea for TypeScript

Status: Open.

#59550 In microsoft/TypeScript;

· CraigMacomber opened on Aug 7, 2024

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Backlog

Synthesized optional properties don't satisfy <code>Record&lt;</code> target under EOPT: false

Experimentation NeededSomeone needs to try this out to see what happensSomeone needs to try this out to see what happens

SuggestionAn idea for TypeScriptAn idea for TypeScript

Status: Open.

#59180 In microsoft/TypeScript;

· todor-a opened on Jul 8, 2024

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Backlog