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OpenSep 1, 2026
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Deprecation error message reporting method type as deprecated instead of method name
BugA bug in TypeScriptA bug in TypeScriptDomain: Error MessagesThe issue relates to error messagingThe issue relates to error messagingHelp WantedYou can do thisYou can do thisStatus: Open.#62396 In microsoft/TypeScript;Distribute property type union members to create union of object types
BugA bug in TypeScriptA bug in TypeScriptDomain: check: Type InferenceRelated to type inference performed during signature resolution or `infer` type resolutionRelated to type inference performed during signature resolution or `infer` type resolutionStatus: Open.#36969 In microsoft/TypeScript;Unexpected "'Type' is declared but its value is never read." error with jsdoc @import syntax
BugA bug in TypeScriptA bug in TypeScriptDomain: JSDocRelates to JSDoc parsing and type generationRelates to JSDoc parsing and type generationHelp WantedYou can do thisYou can do thisStatus: Open.#60908 In microsoft/TypeScript;"const" was transformed to "var" when target is "esnext"
BugA bug in TypeScriptA bug in TypeScriptDomain: JS EmitThe issue relates to the emission of JavaScriptThe issue relates to the emission of JavaScriptHelp WantedYou can do thisYou can do thisStatus: Open.#59877 In microsoft/TypeScript;Incorrect use-before-declaration error in async IIFE initializer
BugA bug in TypeScriptA bug in TypeScriptDomain: BinderGenerally crashes in, or caused by, the binder not doing something rightGenerally crashes in, or caused by, the binder not doing something rightHelp WantedYou can do thisYou can do thisStatus: Open.#50123 In microsoft/TypeScript;[TS 5.4.0-beta] .d.ts emit adding an inline type import instead of utilising existing import
Domain: Declaration EmitThe issue relates to the emission of d.ts filesThe issue relates to the emission of d.ts filesHelp WantedYou can do thisYou can do thisPossible 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.#57415 In microsoft/TypeScript;Narrowing discriminated union via type predicate and type assertion results in different behavior.
Needs InvestigationThis issue needs a team member to investigate its status.This issue needs a team member to investigate its status.Status: Open.#45770 In microsoft/TypeScript;Problem with infer two types from string at same time
Needs InvestigationThis issue needs a team member to investigate its status.This issue needs a team member to investigate its status.Status: Open.#56936 In microsoft/TypeScript;Decouple jsx element type from jsx factory return type and sfc return type
Breaking ChangeWould introduce errors in existing codeWould introduce errors in existing codeDomain: JSX/TSXRelates to the JSX parser and emitterRelates to the JSX parser and emitterEffort: ModerateRequires experience with the TypeScript codebase, but feasible. Harder than "Effort: Casual".Requires experience with the TypeScript codebase, but feasible. Harder than "Effort: Casual".SuggestionAn idea for TypeScriptAn idea for TypeScriptStatus: Open.#21699 In microsoft/TypeScript;Go to definition for TypeScript literal strings
Domain: LS: Symbol NavigationRelates to go-to-definition, find-all-references, highlighting/occurrences.Relates to go-to-definition, find-all-references, highlighting/occurrences.Experience EnhancementNoncontroversial enhancementsNoncontroversial enhancementsHelp WantedYou can do thisYou can do thisSuggestionAn idea for TypeScriptAn idea for TypeScriptStatus: Open.#49033 In microsoft/TypeScript;Conditional type prevents assignability
BugA bug in TypeScriptA bug in TypeScriptDomain: Conditional TypesThe issue relates to conditional typesThe issue relates to conditional typesHelp WantedYou can do thisYou can do thisStatus: Open.#48033 In microsoft/TypeScript;deleteCountparam tosplice()is not optional in es5 typesBugA 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.#32638 In microsoft/TypeScript;Trigger Node type acquisition on matching shebang
Domain: JavaScriptThe issue relates to JavaScript specificallyThe issue relates to JavaScript specificallyExperience EnhancementNoncontroversial enhancementsNoncontroversial enhancementsSuggestionAn idea for TypeScriptAn idea for TypeScriptStatus: Open.#46278 In microsoft/TypeScript;Dangerous "name" (and potentially others) global
CommittedThe 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 TypeScriptGood First IssueWell scoped, documented and has the green lightWell scoped, documented and has the green lightHelp WantedYou can do thisYou can do thisSuggestionAn idea for TypeScriptAn idea for TypeScriptStatus: Open.#18433 In microsoft/TypeScript;cloneNode should return sub type, not Node
BugA 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 TypeScriptHelp WantedYou can do thisYou can do thisStatus: Open.#283 In microsoft/TypeScript;Abstract classes will still import the value for a computed property at runtime
BugA bug in TypeScriptA bug in TypeScriptDomain: JS EmitThe issue relates to the emission of JavaScriptThe issue relates to the emission of JavaScriptStatus: Open.#33525 In microsoft/TypeScript;Intellisense does not work with [P in keyof T]
Experience EnhancementNoncontroversial enhancementsNoncontroversial enhancementsSuggestionAn idea for TypeScriptAn idea for TypeScriptStatus: Open.#13701 In microsoft/TypeScript;Support Intellisense for string/number literals in a widened union
Experience EnhancementNoncontroversial enhancementsNoncontroversial enhancementsHas ReproThis issue has compiler-backed repros: https://aka.ms/ts-reprosThis issue has compiler-backed repros: https://aka.ms/ts-reprosSuggestionAn idea for TypeScriptAn idea for TypeScriptStatus: Open.#33471 In microsoft/TypeScript;document.createTreewalker and document.createNodeIterator have missing signature types that which are supported both in IE, Firefox and Chrome
BugA 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.#33462 In microsoft/TypeScript;jsdoc mouse hover definition {Array.<static class>} bug
Experience EnhancementNoncontroversial enhancementsNoncontroversial enhancementsSuggestionAn idea for TypeScriptAn idea for TypeScriptStatus: Open.#33455 In microsoft/TypeScript;navto does not include jsdoc @typedef symbols
Experience EnhancementNoncontroversial enhancementsNoncontroversial enhancementsSuggestionAn idea for TypeScriptAn idea for TypeScriptStatus: Open.#33404 In microsoft/TypeScript;support destructuring parameter @param tag in tsdoc
Experience EnhancementNoncontroversial enhancementsNoncontroversial enhancementsSuggestionAn idea for TypeScriptAn idea for TypeScriptStatus: Open.#33367 In microsoft/TypeScript;Type of heterogeneous enum value can't be inferred correctly when used in object literal
BugA bug in TypeScriptA bug in TypeScriptDomain: enumEnums and their associated types/valuesEnums and their associated types/valuesStatus: Open.#33439 In microsoft/TypeScript;Signature help not select correct overload for partially completed function
Experience EnhancementNoncontroversial enhancementsNoncontroversial enhancementsSuggestionAn idea for TypeScriptAn idea for TypeScriptStatus: Open.#33328 In microsoft/TypeScript;Union types and overloads acts a bit weirdly
BugA bug in TypeScriptA bug in TypeScriptDomain: check: Type InferenceRelated to type inference performed during signature resolution or `infer` type resolutionRelated to type inference performed during signature resolution or `infer` type resolutionStatus: Open.#33101 In microsoft/TypeScript;