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

Crash when defining `Array` type via `[]` syntax Open

Bug Domain: check: Type Circularity Has Repro Help Wanted

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

microsoft/TypeScript#57009 · 5 comments · Opened Jan 10, 2024
Multimatch Overloads and a New User Contract for Overload Declarations. Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#57004 · 4 comments · Opened Jan 10, 2024
feat: support generic type name: `Record<name: string, value: string>` Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#57001 · 2 comments · Opened Jan 10, 2024
`Object(x) === x` fails to narrow to `object` Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#57000 · 6 comments · 6 reactions · Opened Jan 10, 2024
Editor hangs during folder rename in TypeScript projects Open

Needs More Info

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

microsoft/TypeScript#57335 · 1 comment · 1 reaction · Opened Jan 9, 2024
Binary expression in an `if` condition can't narrow identifier reassigned within expression of the optional chain Open

Experience Enhancement Help Wanted Suggestion

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

microsoft/TypeScript#56998 · Opened Jan 9, 2024
Weak type not rejected when intersected with `ThisType` Open

Bug Domain: This-Typing Help Wanted

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

microsoft/TypeScript#56995 · 6 comments · Opened Jan 9, 2024
Inferred Promise type breaks ordering of completions Open

Domain: LS: Completion Lists Experience Enhancement Help Wanted Suggestion

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

microsoft/TypeScript#56978 · Opened Jan 8, 2024
error in Variadic Tuple Types , if i reverse the partial function Open

Domain: check: Type Inference Help Wanted Possible Improvement

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

microsoft/TypeScript#56970 · 4 comments · Opened Jan 7, 2024
Typings for navigator.connection gone since TS 4.8 Open

Bug Domain: lib.d.ts Help Wanted Needs Human Review

microsoft/TypeScript#56962 · 3 comments · 8 reactions · 2 assignees · Opened Jan 5, 2024
`typesVersions` doesn't match behaviour of `exports` Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#56957 · 4 reactions · Opened Jan 5, 2024
Avoid using just color to distinguish markers in type compatibility chart (WCAG 1.4.1) Open

Website

microsoft/TypeScript#56947 · 4 reactions · 1 assignee · Opened Jan 4, 2024
Deprecate homomorphic mapped type over primitive Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#56940 · 10 comments · 1 reaction · Opened Jan 3, 2024
Problem with infer two types from string at same time Open

Needs Investigation

microsoft/TypeScript#56936 · 11 comments · 2 reactions · 1 assignee · Opened Jan 3, 2024
Low priority inference trumps a much better inference that can be made from a generic signature Open

Domain: check: Type Inference Possible Improvement

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

microsoft/TypeScript#56931 · Opened Jan 2, 2024
Document default for `resolveJsonModule` Open

Docs

Difficulty 1/5 Under an hour Newbie friendliness 62/100

microsoft/TypeScript#56926 · Opened Jan 2, 2024
In WebView, using Map is not possible. Open

Needs Investigation

microsoft/TypeScript#56924 · 10 comments · 3 reactions · 1 assignee · Opened Jan 2, 2024
Counterexample to current ReturnType logic with type parameters Open

In Discussion Suggestion

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

microsoft/TypeScript#56919 · 1 comment · Opened Jan 1, 2024
Start following semantic versioning Open

Discussion

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

microsoft/TypeScript#56916 · 20 comments · 1 reaction · Opened Jan 1, 2024
Generic constraint wipes out precise key type Open

Domain: Mapped Types Help Wanted Possible Improvement

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

microsoft/TypeScript#56912 · 3 comments · Opened Dec 31, 2023
Reverse mapped type fails to be inferred with constraint that is a union containing an intersection Open

Domain: check: Type Inference Possible Improvement

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

microsoft/TypeScript#56910 · Opened Dec 31, 2023
Intersection, Union depends on type variable instantiation order Open

In Discussion Suggestion

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

microsoft/TypeScript#56906 · 7 comments · 3 reactions · Opened Dec 30, 2023
Can't assign to partial of intersection with mapped type over generic Open

Domain: Mapped Types Help Wanted Possible Improvement

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

microsoft/TypeScript#56905 · 2 comments · Opened Dec 30, 2023
tsc crash with jsdoc typedef and object exported with same name. Open

Bug Domain: Crashes

microsoft/TypeScript#56891 · 1 comment · 1 assignee · Opened Dec 27, 2023
When the initial element of the tuple is a rest element, it is not possible to correctly infer the type of the initial element. Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#56885 · 4 comments · Opened Dec 27, 2023
Type can't `keyof` Open

Needs Investigation

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

microsoft/TypeScript#56871 · 6 comments · Opened Dec 25, 2023
Package compiler as `dotnet tool` and publish on nuget Open

Needs Investigation

microsoft/TypeScript#56851 · 2 comments · 1 reaction · 1 assignee · Opened Dec 22, 2023
Specialized error message when asking for a named object property on a tuple? Open

Experience Enhancement Rescheduled Suggestion

microsoft/TypeScript#56825 · 3 comments · 3 reactions · 1 assignee · Opened Dec 18, 2023
Type parameter constrained to an array is not indexable by `${number}` Open

Domain: Indexed Access Types Possible Improvement

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

microsoft/TypeScript#56823 · 3 comments · 3 reactions · Opened Dec 18, 2023
emit an error when using #private fields in their "temporal dead zone" Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#56810 · 3 comments · Opened Dec 17, 2023
`@experimental` JSDoc tag, with strikethrough style (or similar) like `@deprecated` JSDoc tag Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#56808 · 7 comments · 43 reactions · Opened Dec 17, 2023
`@type {const}` produces namespace in .d.ts instead of normal object type Open

Bug Domain: JSDoc Rescheduled

microsoft/TypeScript#56789 · 6 comments · 1 assignee · Opened Dec 15, 2023
switch (typeof something) isn't seen as exhaustive Open

Domain: check: Control Flow Help Wanted Possible Improvement

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

microsoft/TypeScript#56786 · 5 comments · Opened Dec 14, 2023
Option to use "moduleResolution": "NodeNext" with new "module" value that outputs ESM code Open

Needs More Info

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

microsoft/TypeScript#56779 · 4 comments · Opened Dec 14, 2023
Allow interfaces to declare members that inheritors must define Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#56774 · 2 comments · Opened Dec 14, 2023
Incorrect inferred function return type with destructuring assignments Open

Bug Domain: check: Type Inference Help Wanted

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

microsoft/TypeScript#56771 · 5 comments · Opened Dec 13, 2023
Infer array as tuple when used as rest argument in a complex expression Open

Domain: check: Type Inference Help Wanted Possible Improvement

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

microsoft/TypeScript#56765 · 3 comments · 1 reaction · Opened Dec 13, 2023
computed keys with private element and super call should not be hoisted when targeted to ES2022 Open

Bug Domain: classes Effort: Moderate

microsoft/TypeScript#56754 · 6 comments · 1 reaction · 1 assignee · Opened Dec 12, 2023
Abstract property specified on multiple classes loses modifier after intersection Open

Bug Domain: Intersection Help Wanted

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

microsoft/TypeScript#56738 · Opened Dec 11, 2023
Union of user-defined type guards spawns incorrect type Open

Domain: check: Type Inference Help Wanted Possible Improvement

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

microsoft/TypeScript#56731 · 1 comment · Opened Dec 11, 2023
Unexpected widening of template literal string type when the function's type is referenced by the constraint of a additional uninvolved type parameter Open

Domain: check: Type Inference Help Wanted Possible Improvement

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

microsoft/TypeScript#56724 · Opened Dec 10, 2023
Problem with function types, <T>() => T extends X ? () : () Open

Cursed? Domain: check: Variance Relationships Help Wanted Possible Improvement

Difficulty 4/5 3-5 days Newbie friendliness 30/100

microsoft/TypeScript#56721 · 10 comments · Opened Dec 9, 2023
Surprising difference in nested calls inference from contextual type Open

Domain: check: Type Inference Help Wanted Possible Improvement

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

microsoft/TypeScript#56714 · 1 reaction · Opened Dec 8, 2023
Empty types and types with `never` as a key behave differently Open

Bug Domain: Mapped Types Help Wanted

Difficulty 4/5 3-5 days Newbie friendliness 30/100

microsoft/TypeScript#56691 · 6 comments · 2 reactions · Opened Dec 6, 2023
Confusing diagnostics with exact optional property types (EOPT) Open

Bug Domain: flag: exactOptionalPropertyTypes Help Wanted

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

microsoft/TypeScript#56682 · 2 reactions · Opened Dec 5, 2023
Problems with Node.js `--experimental-detect-module` Open

Discussion

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

microsoft/TypeScript#56678 · 27 comments · Opened Dec 5, 2023
Settings to prefer local import over external import v2 Open

Awaiting More Feedback Domain: LS: Auto-import Suggestion

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

microsoft/TypeScript#56676 · 2 reactions · Opened Dec 5, 2023
Generic type changes depending if its parameter type is wrapped or not. Open

Needs Investigation

microsoft/TypeScript#56675 · 3 comments · 1 reaction · 1 assignee · Opened Dec 5, 2023
Support `@var` or `@member` JSDoc tags Open

Awaiting More Feedback Domain: JSDoc Suggestion

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

microsoft/TypeScript#56674 · 2 comments · 4 reactions · Opened Dec 5, 2023
Class generics not evaluated properly in JSDoc Open

Needs Investigation

microsoft/TypeScript#56671 · 1 comment · 2 reactions · 1 assignee · Opened Dec 5, 2023

microsoft/TypeScript

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