Repository Issues
Microsoft/TypeScript
TypeScript is a superset of JavaScript that compiles to clean JavaScript output.
Issues
Open
`importHelpers` incorrectly requires `tslib` for native `#private` class members at every dated `target` (ES2022–ES2025), even though no helper is ever emitted
BugDomain: tslib and Helper FunctionsHelp Wanted
No assignee yetNo comments yetHas a beginner-friendly labelContributing guide available
0 comments1 reaction0 assignees
Open
Type narrowing not working correctly with Uppercase<string> & Lowercase<string>
BugDomain: check: Control FlowHelp Wanted
Why recommendedNo assignee yet · Has a beginner-friendly label
No assignee yetHas a beginner-friendly labelContributing guide available
6 comments1 reaction0 assignees
Open
`Array.prototype.at` docs use "code unit" instead of "item"
Domain: lib.d.tsHelp Wanted
Why recommendedNo assignee yet · Has a beginner-friendly label
No assignee yetHas a beginner-friendly labelContributing guide available
2 comments1 reaction0 assignees
Open
TS1518 depends on operand order in negated v-mode class unions
BugDomain: ParserHelp Wanted
Why recommendedNo assignee yet · Has a beginner-friendly label
No assignee yetHas a beginner-friendly labelContributing guide available
1 comment0 reactions0 assignees
Open
ES2025 regex syntax (duplicate named groups, pattern modifiers) is not gated by `target`
BugDomain: ParserHelp Wanted
Why recommendedNo assignee yet · Has a beginner-friendly label
No assignee yetHas a beginner-friendly labelContributing guide available
1 comment0 reactions0 assignees
Open
Should not allow `import.defer?.('x')`
BugDomain: ParserHelp Wanted
Why recommendedNo assignee yet · Has a beginner-friendly label
No assignee yetHas a beginner-friendly labelContributing guide available
2 comments0 reactions0 assignees
Open
JSDoc for properties of intersected types is no longer merged
BugDomain: LS: Quick InfoHelp Wanted
Why recommendedNo assignee yet · No comments yet
No assignee yetNo comments yetHas a beginner-friendly labelContributing guide available
0 comments4 reactions0 assignees
Open
DOM: `Element#matches()` incorrectly narrows types
Domain: lib.d.tsHelp Wanted
Why recommendedNo assignee yet · Has a beginner-friendly label
No assignee yetHas a beginner-friendly labelContributing guide available
12 comments2 reactions0 assignees
Open
Add type definition for Math.sumPrecise (ES2025 / TC39 proposal)
BugDomain: lib.d.tsHelp Wanted
Why recommendedNo assignee yet · Has a beginner-friendly label
No assignee yetHas a beginner-friendly labelContributing guide available
5 comments3 reactions0 assignees
Open
`lib.dom.d.ts`: Keyframe interface should allow CSS Typed Object Model objects like CSSTransformValue, etc
BugDomain: lib.d.tsHelp Wanted
Why recommendedNo assignee yet · Has a beginner-friendly label
No assignee yetHas a beginner-friendly labelContributing guide available
1 comment0 reactions0 assignees
Open
Confusing error message (2322), should use (2741) and (2322) error message when this["XXX"] = {...} has a missing (or mispelled) key or an incompatible value.
BugDomain: Error MessagesHelp Wanted
Why recommendedNo assignee yet · Has a beginner-friendly label
No assignee yetHas a beginner-friendly labelContributing guide available
10 comments0 reactions0 assignees
Open
Intellisense keeps crashing
BugDomain: LS: TSServerHelp Wanted
Why recommendedNo assignee yet · Has a beginner-friendly label
No assignee yetHas a beginner-friendly labelContributing guide available
24 comments0 reactions0 assignees
Open
Crash: RangeError: Maximum call stack size exceeded in isReachableFlowNodeWorker with complex for loop headers
BugDomain: check: Control FlowHelp Wanted
Why recommendedNo assignee yet · Has a beginner-friendly label
No assignee yetHas a beginner-friendly labelContributing guide available
5 comments0 reactions0 assignees
Open
Crash: RangeError: Maximum call stack size exceeded during type serialization of recursive distributive mapped types
BugDomain: check: Type CircularityHelp Wanted
Why recommendedNo assignee yet · Has a beginner-friendly label
No assignee yetHas a beginner-friendly labelContributing guide available
3 comments0 reactions0 assignees
Open
Double error message when referencing variable of type union of string literals from ambient declaration
Domain: Error MessagesFix AvailableHelp WantedPossible Improvement
Why recommendedNo assignee yet · Has a beginner-friendly label
No assignee yetHas a beginner-friendly labelContributing guide available
3 comments0 reactions0 assignees
Open
Regression: Generic function returning union of tuples is not assignable to identical type since v4.2
Domain: check: Type InferenceHelp WantedPossible Improvement
Why recommendedNo assignee yet · Has a beginner-friendly label
No assignee yetHas a beginner-friendly labelContributing guide available
4 comments0 reactions0 assignees
Open
Crash: when inferring from a tuple with middle rest elements and trailing variadic elements
BugDomain: CrashesHelp Wanted
Why recommendedNo assignee yet · Has a beginner-friendly label
No assignee yetHas a beginner-friendly labelContributing guide available
1 comment0 reactions0 assignees
Open
Crash: RangeError: Maximum call stack size exceeded in addTypesToUnion when using incomplete keyof type annotation on object destructuring
BugDomain: CrashesFix AvailableHelp Wanted
Why recommendedHas a beginner-friendly label · Contributing guide available
Has a beginner-friendly labelContributing guide available
3 comments1 reaction2 assignees
Open
JSDoc comments for async_hooks are confusing/misleading
Experience EnhancementHelp WantedSuggestion
Why recommendedNo assignee yet · Has a beginner-friendly label
No assignee yetHas a beginner-friendly labelContributing guide available
2 comments0 reactions0 assignees
Open
Crash: RangeError: Maximum call stack size exceeded during contextual typing of object literal with yield in computed property name
BugDomain: check: Contextual TypesHelp Wanted
Why recommendedNo assignee yet · Has a beginner-friendly label
No assignee yetHas a beginner-friendly labelContributing guide available
1 comment0 reactions0 assignees