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TypeScript 5.6.0
OpenDec 3, 2025
No due date
•Last updated 80% complete
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0 of 14 selected 0 issues of 14 selected
Crashes on transform and parse (from assertion/debug failures)
BugA bug in TypeScriptA bug in TypeScriptCrashFor flagging bugs which are compiler or service crashes or unclean exits, rather than bad outputFor flagging bugs which are compiler or service crashes or unclean exits, rather than bad outputDomain: API: TransformsRelates to the public transform APIRelates to the public transform APIEffort: CasualGood issue if you're already used to contributing to the codebase. Harder than "good first issue".Good issue if you're already used to contributing to the codebase. Harder than "good first issue".Fix AvailableA PR has been opened for this issueA PR has been opened for this issueHelp WantedYou can do thisYou can do thisStatus: Open.#58924 In microsoft/TypeScript;“Lexical environment is not suspended” when visitEachChile
BugA bug in TypeScriptA bug in TypeScriptDomain: API: TransformsRelates to the public transform APIRelates to the public transform APIStatus: Open.#58020 In microsoft/TypeScript;When relatively importing a
.d.tsfile in a declaration file, TypeScript loads a.tsfile insteadFix AvailableA PR has been opened for this issueA PR has been opened for this issueNeeds InvestigationThis issue needs a team member to investigate its status.This issue needs a team member to investigate its status.Status: Open.#58353 In microsoft/TypeScript;Defer TransformFlags Calculation
Domain: PerformanceReports of unusually slow behaviorReports of unusually slow behaviorExperimentation NeededSomeone needs to try this out to see what happensSomeone needs to try this out to see what happensSuggestionAn idea for TypeScriptAn idea for TypeScriptStatus: Open.#58395 In microsoft/TypeScript;Reachability analysis of
neverforyield*is uncheckedNeeds InvestigationThis issue needs a team member to investigate its status.This issue needs a team member to investigate its status.Status: Open.#58582 In microsoft/TypeScript;TypeScript emits d.ts file that is invalid for complex mapped type.
BugA bug in TypeScriptA bug in TypeScriptDomain: Declaration EmitThe issue relates to the emission of d.ts filesThe issue relates to the emission of d.ts filesStatus: Open.#58688 In microsoft/TypeScript;Bad error when using
import()type within JSDoc tag@implementsBugA bug in TypeScriptA bug in TypeScriptDomain: JSDocRelates to JSDoc parsing and type generationRelates to JSDoc parsing and type generationFix AvailableA PR has been opened for this issueA PR has been opened for this issueStatus: Open.#58542 In microsoft/TypeScript;Compiler cannot handle promise.then(null | undefined)
Needs InvestigationThis issue needs a team member to investigate its status.This issue needs a team member to investigate its status.Status: Open.#58619 In microsoft/TypeScript;"The inferred type of X cannot be named without a reference to Y" (TS2742) still happens, when working with npm link to link packages manually
Experience EnhancementNoncontroversial enhancementsNoncontroversial enhancementsNeeds InvestigationThis issue needs a team member to investigate its status.This issue needs a team member to investigate its status.Status: Open.#58914 In microsoft/TypeScript;Typescript 5.5 performance regression on arktype
BugA bug in TypeScriptA bug in TypeScriptDomain: PerformanceReports of unusually slow behaviorReports of unusually slow behaviorStatus: Open.#58805 In microsoft/TypeScript;Incorrect class #private fields initialization order with target ES2022 and useDefineForClassFields set to false
Needs InvestigationThis issue needs a team member to investigate its status.This issue needs a team member to investigate its status.Status: Open.#54206 In microsoft/TypeScript;Investigate Wildcard Matching Performance
Domain: PerformanceReports of unusually slow behaviorReports of unusually slow behaviorSuggestionAn idea for TypeScriptAn idea for TypeScriptStatus: Open.#59058 In microsoft/TypeScript;Naked generic type returned from iterator method
BugA bug in TypeScriptA bug in TypeScriptDomain: This-TypingThe issue relates to providing types to thisThe issue relates to providing types to thisStatus: Open.#59161 In microsoft/TypeScript;TS Server fatal error: Maximum call stack size exceeded
BugA bug in TypeScriptA bug in TypeScriptDomain: CrashesUnhandled exceptions/panics with no immediate primary root cause identifiedUnhandled exceptions/panics with no immediate primary root cause identifiedStatus: Open.#59047 In microsoft/TypeScript;
