microsoft/TypeScript

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TypeScript is a superset of JavaScript that compiles to clean JavaScript output.

Stars: 111k
Forks: 14.4k
Open beginner issues: 18
Indexed issues: 4.9k
Avg merge: 1d 19h
Merged PRs (30d): 117

Dominant language: Go
License: Apache-2.0
Last GitHub push: Sep 19, 2026
Latest indexed: Sep 19, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: help wanted good first issue

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4,855 open issues indexed

Symbol = LiveSymbol | DeadSymbol Open

Awaiting More Feedback Suggestion

Difficulty 5/5 Over a week Newbie friendliness 42/100

microsoft/TypeScript#59574 · 6 comments · Opened Aug 9, 2024
Inconsistency between element access and object destruction Open

Domain: check: Type Inference Help Wanted Possible Improvement

Difficulty 4/5 3-5 days Newbie friendliness 45/100

microsoft/TypeScript#59571 · 1 comment · Opened Aug 9, 2024
Variance annotations are not allowed in type aliases for intersections Open

Needs Investigation

microsoft/TypeScript#59561 · 5 comments · 2 reactions · 1 assignee · Opened Aug 8, 2024
Suggestion: use numeric literals for `BYTES_PER_ELEMENT` Open

Domain: lib.d.ts Experience Enhancement Help Wanted Suggestion

Difficulty 2/5 1-3 hours Newbie friendliness 58/100

microsoft/TypeScript#59557 · 1 reaction · Opened Aug 8, 2024
AllowUnresolveNames not working for completion getters/setters and property signature and declaration Open

Domain: LS: Refactorings Experience Enhancement Suggestion

Difficulty 3/5 1-2 days Newbie friendliness 48/100

microsoft/TypeScript#59554 · Opened Aug 8, 2024
Inline *_base declaration in d.ts files Open

Experimentation Needed Suggestion

Difficulty 5/5 Over a week Newbie friendliness 35/100

microsoft/TypeScript#59550 · 5 comments · 2 reactions · Opened Aug 7, 2024
Unexpected declaration error when using symbols and intersections Open

Bug Domain: Declaration Emit Help Wanted

Difficulty 4/5 3-5 days Newbie friendliness 42/100

microsoft/TypeScript#59541 · 1 comment · 2 reactions · Opened Aug 6, 2024
Feature request: TS/JS: during object destructurization show autocomplete for props after user type comma `,` Open

Domain: LS: Completion Lists Experience Enhancement Help Wanted Suggestion

Difficulty 4/5 3-5 days Newbie friendliness 35/100

microsoft/TypeScript#59537 · 2 comments · 2 reactions · Opened Aug 4, 2024
Add `(` as a commit character to TSServer Open

Domain: LS: Completion Lists Suggestion

microsoft/TypeScript#59525 · 1 assignee · Opened Aug 3, 2024
Type inference on tuple intersection types broken Open

Domain: check: Type Inference Help Wanted Possible Improvement

Difficulty 5/5 Over a week Newbie friendliness 25/100

microsoft/TypeScript#59521 · Opened Aug 2, 2024
functions with destructuring parameters are not inferred as type predicate correctly Open

Awaiting More Feedback Suggestion

Difficulty 4/5 3-5 days Newbie friendliness 45/100

microsoft/TypeScript#59497 · 5 comments · 1 reaction · Opened Aug 1, 2024
Type predicate for an optional property is not inferred Open

Awaiting More Feedback Suggestion

Difficulty 4/5 3-5 days Newbie friendliness 35/100

microsoft/TypeScript#59494 · 6 comments · 2 reactions · Opened Jul 31, 2024
Hide prototype completions for properties of a component in JSX context Open

Experience Enhancement Help Wanted Suggestion

Difficulty 5/5 Over a week Newbie friendliness 35/100

microsoft/TypeScript#59486 · 2 comments · 5 reactions · Opened Jul 31, 2024
Method use showing as deprecated when callback function includes type hint Open

Needs More Info

Difficulty 3/5 1-2 days Newbie friendliness 35/100

microsoft/TypeScript#59488 · 2 comments · Opened Jul 31, 2024
`organizeImports` does not merge value and type imports Open

Awaiting More Feedback Domain: LS: Organize Imports Suggestion

Difficulty 3/5 1-2 days Newbie friendliness 45/100

microsoft/TypeScript#59460 · 3 comments · Opened Jul 29, 2024
Change quick fix JSDoc Import Open

Awaiting More Feedback Suggestion

Difficulty 3/5 1-2 days Newbie friendliness 35/100

microsoft/TypeScript#59435 · Opened Jul 26, 2024
Unique type Open

Awaiting More Feedback Suggestion

Difficulty 5/5 Over a week Newbie friendliness 30/100

microsoft/TypeScript#59431 · 5 comments · 1 reaction · Opened Jul 26, 2024
Don't allow math operations on different branded numeric types Open

Awaiting More Feedback Suggestion

Difficulty 5/5 Over a week Newbie friendliness 35/100

microsoft/TypeScript#59423 · 3 comments · 3 reactions · Opened Jul 25, 2024
Code generated by Webpack shows error in `exports` parameters in module lambdas as if they were a conflicting global `exports` Open

Awaiting More Feedback Suggestion

Difficulty 4/5 3-5 days Newbie friendliness 35/100

microsoft/TypeScript#59420 · 3 comments · Opened Jul 25, 2024
No completions for type parameters in generic function return type Open

Help Wanted Suggestion

Difficulty 3/5 1-2 days Newbie friendliness 45/100

microsoft/TypeScript#59419 · 1 comment · Opened Jul 25, 2024
`'X' only refers to a type` error in JSDoc comments Open

Bug Domain: check: Error Instability Needs Human Review Needs More Info

microsoft/TypeScript#59401 · 2 comments · 1 assignee · Opened Jul 23, 2024
Duplicate keys do not error Open

Awaiting More Feedback Suggestion

Difficulty 4/5 3-5 days Newbie friendliness 25/100

microsoft/TypeScript#59396 · 7 comments · Opened Jul 23, 2024
Types with optional props get implicit index signatures that cannot be made explicit Open

In Discussion Suggestion

Difficulty 4/5 3-5 days Newbie friendliness 35/100

microsoft/TypeScript#59392 · 2 comments · Opened Jul 22, 2024
Default type parameter values always shown on hover Open

Awaiting More Feedback Suggestion

Difficulty 5/5 Over a week Newbie friendliness 25/100

microsoft/TypeScript#59385 · 2 comments · 1 reaction · Opened Jul 21, 2024
TS2416 nonsensical fix suggestion (and possible false positive?) in a generic class implementing an interface verbatim Open

Domain: check: Variance Relationships Help Wanted Possible Improvement

Difficulty 4/5 3-5 days Newbie friendliness 35/100

microsoft/TypeScript#59377 · 3 comments · Opened Jul 21, 2024
Allow customization of type display format in hover tooltips Open

Awaiting More Feedback Suggestion

Difficulty 5/5 Over a week Newbie friendliness 35/100

microsoft/TypeScript#59370 · 4 comments · 3 reactions · Opened Jul 20, 2024
TS2590 for simple ternary expression with large discriminated union Open

Bug Domain: check: Big Unions Help Wanted

Difficulty 5/5 Over a week Newbie friendliness 25/100

microsoft/TypeScript#59367 · 1 comment · Opened Jul 19, 2024
Contextual parameters inferred from overloads improvements Open

Awaiting More Feedback Suggestion

Difficulty 5/5 Over a week Newbie friendliness 32/100

microsoft/TypeScript#59350 · 1 reaction · Opened Jul 18, 2024
[proposal] Non widened string values should be valid enum values, like widened string values Open

Suggestion

microsoft/TypeScript#59346 · 3 comments · 1 reaction · 1 assignee · Opened Jul 18, 2024
⚡ Performance: Project service doesn't cache all fs.realpath Open

microsoft/TypeScript#59342 · 2 comments · 1 reaction · 1 assignee · Opened Jul 18, 2024
⚡ Performance: Project service doesn't cache all fs.statSync Open

microsoft/TypeScript#59338 · 18 comments · 1 assignee · Opened Jul 17, 2024
Ability to type check setters in interface implementations Open

Awaiting More Feedback Suggestion

Difficulty 5/5 Over a week Newbie friendliness 25/100

microsoft/TypeScript#59331 · 2 comments · 5 reactions · Opened Jul 17, 2024
Mapped type of a conditional type unexpectedly fails inference Open

Domain: Conditional Types Help Wanted Possible Improvement

Difficulty 5/5 Over a week Newbie friendliness 35/100

microsoft/TypeScript#59323 · 2 comments · Opened Jul 17, 2024
Instantiation expressions don't reject incompatible signatures in situations with mixed call and construct signatures Open

Domain: check: Type Inference Help Wanted Possible Improvement

Difficulty 4/5 3-5 days Newbie friendliness 35/100

microsoft/TypeScript#59319 · 4 comments · 1 reaction · Opened Jul 17, 2024
Callback argument type not inferred for union of interfaces Open

Domain: check: Type Inference Help Wanted Possible Improvement

Difficulty 4/5 3-5 days Newbie friendliness 35/100

microsoft/TypeScript#59309 · 1 comment · Opened Jul 16, 2024
Consider disallowing `in` operator use with arbitrary key operands on closed types for which the keys are known Open

Awaiting More Feedback Suggestion

Difficulty 5/5 Over a week Newbie friendliness 35/100

microsoft/TypeScript#59299 · 6 comments · 2 reactions · Opened Jul 16, 2024
Easier use of indexed access types on nullable/optional types Open

Awaiting More Feedback Suggestion

Difficulty 5/5 Over a week Newbie friendliness 35/100

microsoft/TypeScript#59293 · 3 comments · Opened Jul 16, 2024
[Regression] Circular reference error when passing a class expression with non-primitive static properties to a generic function Open

Bug Domain: check: Type Circularity Help Wanted

Difficulty 4/5 3-5 days Newbie friendliness 45/100

microsoft/TypeScript#59271 · Opened Jul 14, 2024
tsc compiler crash on complex project (with tons of tests) Open

Needs Investigation

microsoft/TypeScript#59265 · 10 comments · 1 assignee · Opened Jul 13, 2024
feature request: expose `tsconfig.json` types in TypeScript files Open

Awaiting More Feedback Suggestion

Difficulty 5/5 Over a week Newbie friendliness 30/100

microsoft/TypeScript#59261 · 1 comment · Opened Jul 13, 2024
Mapped types over subclassed arrays behave strangely Open

Needs Investigation

microsoft/TypeScript#59260 · 1 comment · 1 reaction · 1 assignee · Opened Jul 12, 2024
Parse error when using `in` nested in a `for` initializer Open

Bug Domain: Parser Help Wanted

Difficulty 3/5 1-2 days Newbie friendliness 45/100

microsoft/TypeScript#59236 · 7 comments · Opened Jul 11, 2024
Expose MappedType in typescript.d.ts Open

In Discussion Suggestion

Difficulty 3/5 1-2 days Newbie friendliness 35/100

microsoft/TypeScript#59221 · 1 comment · Opened Jul 10, 2024
Function parameter hover info is inconsistent between contexts Open

Awaiting More Feedback Suggestion

Difficulty 3/5 1-2 days Newbie friendliness 38/100

microsoft/TypeScript#59219 · 1 comment · 1 reaction · Opened Jul 10, 2024
Performance: Monomorphic AST Nodes Open

Domain: Performance In Discussion Suggestion

Difficulty 5/5 Over a week Newbie friendliness 15/100

microsoft/TypeScript#59198 · 1 comment · 18 reactions · Opened Jul 9, 2024
Inferred type for accumulator and return value of `Array#reduce` is incorrect when used with `Record<string, unknown>` Open

Domain: check: Type Inference Help Wanted Possible Improvement

Difficulty 4/5 3-5 days Newbie friendliness 45/100

microsoft/TypeScript#59196 · 3 comments · Opened Jul 9, 2024
Object access reports error after upgrading to TypeScript 5.5 Open

Awaiting More Feedback Suggestion

Difficulty 4/5 3-5 days Newbie friendliness 35/100

microsoft/TypeScript#59185 · 5 comments · Opened Jul 8, 2024
Synthesized optional properties don't satisfy `Record<` target under EOPT: false Open

Experimentation Needed Suggestion

Difficulty 4/5 3-5 days Newbie friendliness 35/100

microsoft/TypeScript#59180 · 3 comments · 1 reaction · Opened Jul 8, 2024
@types dependency resolution can reference incorrect version Open

Needs Investigation

microsoft/TypeScript#59173 · 1 comment · 1 assignee · Opened Jul 8, 2024
[isolatedDeclarations] Type of const variable declared with template literal expression containing only literals still requires explicit annotation Open

Domain: flag: isolatedDeclarations Help Wanted Possible Improvement

Difficulty 3/5 1-2 days Newbie friendliness 48/100

microsoft/TypeScript#59157 · Opened Jul 6, 2024

microsoft/TypeScript

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