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When subclassing incorrectly, the compiler error suggests changing base class rather than the derived one

Status: Open.

#61407�?In microsoft/TypeScript;

· parzhitsky opened on Mar 12, 2025

transformTime performance regression since 5.6.x

Status: Open.

#61406�?In microsoft/TypeScript;

· valentinmelusson opened on Mar 12, 2025

Unreliably report for unused local variable in the editor

Status: Open.

#61403�?In microsoft/TypeScript;

· jasonlyu123 opened on Mar 12, 2025

Refactor getTypeOfSymbol for Improved Readability and Maintainability

Status: Open.

#61401�?In microsoft/TypeScript;

· Bashamega opened on Mar 12, 2025

Still only the last overloaded signature is picked when passing an overloaded function to Array.map

Status: Open.

#61398�?In microsoft/TypeScript;

· ExplodingCabbage opened on Mar 11, 2025

require() is generated in JS although there's no runtime code

Status: Open.

#61395�?In microsoft/TypeScript;

· Llorx opened on Mar 11, 2025

Unbound type parameter in declaration files for accessors with divergent types.

Status: Open.

#61391�?In microsoft/TypeScript;

· dragomirtitian opened on Mar 10, 2025

Perf degradation since last version upgrade

Status: Open.

#61400�?In microsoft/TypeScript;

· ShaMan123 opened on Mar 10, 2025

ReadableStreamGenericReader type mismatch

Status: Open.

#61390�?In microsoft/TypeScript;

· gineika opened on Mar 10, 2025

'in' does not remove undefined from indexed value (with noUncheckedIndexedAccess)

Help WantedYou can do thisYou can do this

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.

#61389�?In microsoft/TypeScript;

· Sainan opened on Mar 10, 2025

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Backlog

Array access possibly undefined with noUncheckedIndexedAccess despite findIndex

Working as IntendedThe behavior described is the intended behavior; this is not a bugThe behavior described is the intended behavior; this is not a bug

Status: Open.

#61388�?In microsoft/TypeScript;

· Sainan opened on Mar 10, 2025

[ServerErrors][TypeScript] 5.9.0-dev.20250309 vs 5.8.2

Status: Open.

#61386�?In microsoft/TypeScript;

· typescript-bot opened on Mar 9, 2025