microsoft/TypeScript

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

Stars: 111k
Forks: 14.3k
Open beginner issues: 18
Indexed issues: 4.9k
Avg merge: 2d 4h
Merged PRs (30d): 132

Dominant language: Go
License: Apache-2.0
Last GitHub push: Sep 18, 2026
Latest indexed: Sep 19, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: help wanted good first issue

Beginner friendly Everything

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4,857 open issues indexed

Certain recursive types cause "Maximum call stack size exceeded" error in TS server Open

Bug Domain: Indexed Access Types Help Wanted Needs Human Review

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

microsoft/TypeScript#62471 · 1 comment · Opened Sep 21, 2025
Common fields of union not resolved for generic conditional with `any` branch Open

Bug Domain: Conditional Types Help Wanted

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

microsoft/TypeScript#62466 · Opened Sep 18, 2025
JSDoc comments emitted a second time even after commenrs on type are emitted Open

Bug Domain: Comment Emit Help Wanted

Difficulty 4/5 3-5 days Newbie friendliness 48/100

microsoft/TypeScript#62453 · 3 reactions · Opened Sep 15, 2025
"This import path is unsafe to rewrite because it resolves to another project" missing an error location Open

microsoft/TypeScript#62436 · 1 comment · 2 reactions · 1 assignee · Opened Sep 11, 2025
Allow to specify import sorting. Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#63780 · 6 comments · 10 reactions · Opened Sep 11, 2025
LS Document Symbols / Navigation Tree (or Bar) for JSX trees, like object literals Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#62417 · 4 reactions · Opened Sep 8, 2025
5.8.3 - Big repo with complex types in Angular - Maximum call stack size exceeded Open

Needs More Info

Difficulty 5/5 Over a week Newbie friendliness 20/100

microsoft/TypeScript#62415 · 6 comments · Opened Sep 8, 2025
TypeScript fails to detect self-reference issue in "Parameter Properties" of constructors Open

Bug Domain: check: Control Flow Help Wanted

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

microsoft/TypeScript#62414 · 2 comments · 1 reaction · Opened Sep 8, 2025
Add readonly modifier to Math.min and Math.max Open

Bug Domain: check: Type Inference

Difficulty 1/5 Under an hour Newbie friendliness 55/100

microsoft/TypeScript#62413 · 5 comments · Opened Sep 8, 2025
Destructuring assignment with computed property name does not help narrow types as intended. Open

Domain: check: Control Flow Help Wanted Possible Improvement

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

microsoft/TypeScript#62401 · 4 comments · Opened Sep 5, 2025
Deprecation error message reporting method type as deprecated instead of method name Open

Bug Domain: Error Messages Help Wanted

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

microsoft/TypeScript#62396 · 1 comment · Opened Sep 4, 2025
TSServer crash "Cannot read properties of undefined (reading 'sourceFile')" when switching between files in different projects Open

Needs Investigation

microsoft/TypeScript#62398 · 6 comments · 1 assignee · Opened Sep 4, 2025
Feedback on Expandable hovers for JavaScript and TypeScript Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#62386 · 1 reaction · Opened Sep 3, 2025
Typecheck code blocks in jsdoc Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#62383 · 1 reaction · Opened Sep 3, 2025
Method overloads fail to resolve correctly when using mapped types with conditional generics and optional parameters Open

Needs More Info

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

microsoft/TypeScript#62377 · 1 comment · Opened Sep 2, 2025
[CLI] "@" character removed when it's first path character with --build Open

Bug Domain: tsc -b Help Wanted

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

microsoft/TypeScript#62373 · 4 comments · Opened Sep 1, 2025
"basic"/"relative" moduleResolution Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#62368 · 3 comments · Opened Aug 31, 2025
New intrinsic for Hashing a type to a string Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#62363 · Opened Aug 31, 2025
JSX Fragments are in-properly typed with `<></>` syntax, when using `react-jsx` JSX option Open

Bug Domain: JSX/TSX Help Wanted

microsoft/TypeScript#62358 · 5 reactions · 1 assignee · Opened Aug 30, 2025
`silentNeverType` leak in contextual parameter types coming from anonymous non-aliased object type instantiations Open

Bug Domain: check: Type Inference Help Wanted

Difficulty 4/5 3-5 days Newbie friendliness 48/100

microsoft/TypeScript#62345 · 1 comment · Opened Aug 27, 2025
Enable `--allowImportingTsExtensions` by default Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#62342 · 7 comments · 15 reactions · Opened Aug 27, 2025
Support `@deprecated` marker on namespace aliases Open

Domain: JSDoc Help Wanted Possible Improvement

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

microsoft/TypeScript#62340 · 1 reaction · Opened Aug 27, 2025
Function argument is not infered correctly Open

Domain: check: Type Inference Help Wanted Possible Improvement

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

microsoft/TypeScript#62336 · 1 comment · Opened Aug 26, 2025
Multiple keys being remapped to same key causes unstable modifier propagation Open

Bug Domain: Mapped Types Help Wanted

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

microsoft/TypeScript#62318 · 3 comments · Opened Aug 22, 2025
The last overload gave the following error. Type 'unknown' is not assignable to type 'Foo' Open

microsoft/TypeScript#63779 · 13 comments · 1 assignee · Opened Aug 21, 2025
const/readonly assertion support for `Map` and `Set` Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#62312 · 3 comments · 1 reaction · Opened Aug 21, 2025
JSDoc present in mapped types is not output in generated type literals in declaration files Open

Domain: Declaration Emit Help Wanted Possible Improvement

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

microsoft/TypeScript#62309 · 2 comments · 6 reactions · Opened Aug 20, 2025
Improved `NumberConstructor` for literal types Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#62308 · 5 comments · 1 reaction · Opened Aug 20, 2025
Contextual typing doesn't work when mixing up discriminated unions with function variant Open

Domain: check: Contextual Types Help Wanted Possible Improvement

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

microsoft/TypeScript#62306 · 6 comments · Opened Aug 20, 2025
TS2322 error in tsgo but not tsc Open

microsoft/TypeScript#63778 · 3 comments · 1 assignee · Opened Aug 19, 2025
Incorrect emitted declaration for unique symbol re-assignment Open

Bug Domain: Declaration Emit Help Wanted

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

microsoft/TypeScript#62305 · 1 comment · Opened Aug 19, 2025
Allow explicit fallthrough when noFallthroughCasesInSwitch is enabled Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#62295 · 1 comment · 3 reactions · Opened Aug 17, 2025
Missing error about inability to access conflicting private properties on generic types involving intersections Open

Bug Domain: Indexed Access Types Help Wanted

Difficulty 4/5 3-5 days Newbie friendliness 48/100

microsoft/TypeScript#62294 · 2 comments · Opened Aug 17, 2025
ERROR: Debug Failure. False expression: Script kind should match provided ScriptKind:8 and sourceFile.scriptKind: 3, !entry:false Open

Needs More Info

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

microsoft/TypeScript#62293 · 1 comment · Opened Aug 17, 2025
Stronger existence guarantees for `declare` Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#62290 · 2 comments · Opened Aug 15, 2025
Regression: Maximum call stack exceeded in TypeScript 5.8.3 with large type inference Open

Needs More Info

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

microsoft/TypeScript#62289 · 3 comments · Opened Aug 15, 2025
JSDoc @type completion not working inside function argument Open

Domain: JSDoc Help Wanted Possible Improvement

Difficulty 3/5 1-2 days Newbie friendliness 55/100

microsoft/TypeScript#62281 · Opened Aug 13, 2025
Declaration file emits symbol property keys without importing them Open

Bug Domain: Declaration Emit

microsoft/TypeScript#62257 · 3 comments · 2 reactions · 3 assignees · Opened Aug 11, 2025
Generics in union should be inferred as `never` when possible Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#62248 · 2 comments · 2 reactions · Opened Aug 10, 2025
abstract type guard does not narrow when keyed with a unique symbol Open

Bug Domain: check: Control Flow Help Wanted

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

microsoft/TypeScript#62247 · Opened Aug 10, 2025
JSDoc tags not parsed when a type may be present Open

Bug Domain: JSDoc Help Wanted

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

microsoft/TypeScript#62244 · 2 comments · 1 reaction · Opened Aug 9, 2025
Revert ts5.9 changes for Uint8Array Open

Docs

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

microsoft/TypeScript#62240 · 39 comments · 19 reactions · Opened Aug 9, 2025
`verbatimModuleSyntax` leaves empty curly brackets in the JS output Open

Domain: ES Modules Help Wanted Possible Improvement

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

microsoft/TypeScript#62239 · 1 comment · Opened Aug 8, 2025
Regression in some error elaborations involving a target type mixing arrays with non-arrays Open

Needs Investigation

microsoft/TypeScript#62234 · 1 reaction · 1 assignee · Opened Aug 8, 2025
TypeScript Language Features: `Analyzing '...' and its dependencies` takes crazy long time! Open

Domain: Performance Help Wanted Possible Improvement

Difficulty 4/5 3-5 days Newbie friendliness 38/100

microsoft/TypeScript#62230 · 6 comments · 1 reaction · Opened Aug 7, 2025
`controller.byobRequest` type incorrectly says value is possibly null while `autoAllocateChunkSize` is present. Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#62224 · 6 comments · Opened Aug 7, 2025
`as const` breaks intra expression inference Open

Domain: check: Type Inference Help Wanted Possible Improvement

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

microsoft/TypeScript#62220 · 1 reaction · Opened Aug 6, 2025
Maximum call stack size exceeded Open

Domain: API Needs More Info

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

microsoft/TypeScript#62218 · 3 comments · 2 reactions · Opened Aug 6, 2025
`lib.d.ts` Updates for TypeScript 6.0 Open

Bug Domain: lib.d.ts

microsoft/TypeScript#62215 · 3 comments · 1 assignee · Opened Aug 6, 2025
Find all references does not find `import(fileName)` of the file Open

Needs More Info

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

microsoft/TypeScript#62212 · 1 comment · Opened Aug 5, 2025

microsoft/TypeScript

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