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: 21
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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4,862 open issues indexed

Generic indexed access on a substitution type with an array constraint resolves incorrectly Open

Domain: Indexed Access Types Possible Improvement

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

microsoft/TypeScript#55383 · 3 reactions · Opened Aug 15, 2023
Explicitly annotated unique symbols are widened in return positions Open

Domain: Literal Types Possible Improvement

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

microsoft/TypeScript#55361 · 5 comments · 3 reactions · Opened Aug 14, 2023
Better error message when a module declaration is not found, but a module augmentation is? Open

Experience Enhancement Help Wanted Suggestion

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

microsoft/TypeScript#55347 · 2 comments · Opened Aug 13, 2023
Co-dependency of variables destructured from union types is lost unless used in control-flow statements Open

Domain: check: Control Flow Help Wanted Possible Improvement

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

microsoft/TypeScript#55344 · 2 comments · 2 reactions · Opened Aug 12, 2023
Incorrectly reported `TS2322` error on array items after spread Open

Bug Domain: Error Messages Help Wanted

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

microsoft/TypeScript#55340 · 1 comment · Opened Aug 11, 2023
TypeScript can't infer correct type from while loop if while condition is given a promise Open

Domain: check: Control Flow Help Wanted Possible Improvement

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

microsoft/TypeScript#55300 · 5 comments · Opened Aug 8, 2023
Allow `readonly` with `accessor` Open

Revisit Suggestion

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

microsoft/TypeScript#55289 · 5 comments · 7 reactions · Opened Aug 7, 2023
Higher-kinded Types... And other stuff Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#55280 · 11 comments · 9 reactions · Opened Aug 5, 2023
Suggestion: existential unions and intersections Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#55257 · 7 comments · 14 reactions · Opened Aug 3, 2023
Unwanted auto-imports in script files Open

Effort: Moderate Experience Enhancement Help Wanted Suggestion

microsoft/TypeScript#55256 · 14 comments · 1 assignee · Opened Aug 3, 2023
Allow different properties between the JSX expression and component type Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#55248 · 2 comments · Opened Aug 3, 2023
instanceof narrowing should use InstanceType Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#55241 · 3 reactions · Opened Aug 2, 2023
Feat: infer parameter types for the implementation signature of an overloaded method Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#55236 · 3 comments · Opened Aug 2, 2023
F2 can't format the "satisfies" operator in Typescript Open

Needs Investigation

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

microsoft/TypeScript#55259 · 1 comment · Opened Aug 1, 2023
Rethinking `module` for the present and the future Open

In Discussion Needs Proposal Suggestion

microsoft/TypeScript#55221 · 3 comments · 10 reactions · 1 assignee · Opened Jul 31, 2023
Support JS Doc In Trailing Trivia Open

Awaiting More Feedback Domain: JSDoc Suggestion

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

microsoft/TypeScript#55213 · 2 reactions · Opened Jul 31, 2023
ReferenceError caused by const enum Open

Bug Domain: enum Help Wanted

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

microsoft/TypeScript#55212 · 2 comments · Opened Jul 31, 2023
[ServerErrors][TypeScript] 5.2.0-dev.20230730 Open

Bug Domain: Something Else Needs Human Review Needs More Info

microsoft/TypeScript#55210 · 4 comments · 1 assignee · Opened Jul 30, 2023
Support shorthands when specializing generic functions at the type level Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#55204 · 1 reaction · Opened Jul 30, 2023
JavaScript IntelliSense does not recognize DefineProperty on built-in types Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#55218 · 1 comment · Opened Jul 30, 2023
Combining jsdoc `@this` and `@param` yields invalid `.d.ts` file Open

Needs Investigation Rescheduled

microsoft/TypeScript#55197 · 1 assignee · Opened Jul 29, 2023
Should go to type declaration on arrays if possible Open

Experience Enhancement Help Wanted Suggestion

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

microsoft/TypeScript#55196 · 2 comments · Opened Jul 29, 2023
JS generic inference change after upgrading to 5.1 Open

Needs Investigation Rescheduled

microsoft/TypeScript#55192 · 9 comments · 1 assignee · Opened Jul 28, 2023
Expando function declarations cant emit non-identifier properties Open

Needs More Info

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

microsoft/TypeScript#55190 · 6 comments · Opened Jul 28, 2023
Wrong HINTS of params of function declared with @callback Open

Domain: LS: Inlay Hints Help Wanted Possible Improvement

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

microsoft/TypeScript#55186 · 5 comments · Opened Jul 28, 2023
Enforce property rules on kebab-cased JSX attributes Open

Awaiting More Feedback Suggestion

Difficulty 4/5 3-5 days Newbie friendliness 55/100

microsoft/TypeScript#55182 · 9 comments · 22 reactions · Opened Jul 28, 2023
Migrate `String` to `StringPrototype`, `Number` to `NumberPrototype`, etc Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#55175 · 5 comments · 6 reactions · Opened Jul 27, 2023
potential bug related to generics Open

Needs Investigation

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

microsoft/TypeScript#55173 · 3 comments · Opened Jul 27, 2023
TS intelisense crashes during import Open

Needs More Info

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

microsoft/TypeScript#55176 · 3 comments · Opened Jul 27, 2023
Member-wise checks give incorrect errors for type assertions Open

In Discussion Needs Investigation Rescheduled Suggestion

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

microsoft/TypeScript#55167 · 2 comments · Opened Jul 26, 2023
Covariance breaks when checking for `undefinded` in a type Open

Needs Investigation

microsoft/TypeScript#55161 · 3 comments · 1 assignee · Opened Jul 26, 2023
`tsserver` feature: `importModuleSpecifierPreference: "non-relative"` but allow siblings Open

Awaiting More Feedback Domain: LS: Auto-import Suggestion

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

microsoft/TypeScript#55160 · 1 comment · Opened Jul 26, 2023
Type narrowing of `super` when using `this` Open

Bug Domain: This-Typing

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

microsoft/TypeScript#55155 · Opened Jul 25, 2023
Add an `absent` type forbidding presence Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#55143 · 12 comments · 3 reactions · Opened Jul 25, 2023
Tsconfig option to disable .tsx extension lookup in module resolution Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#55142 · 1 comment · 2 reactions · Opened Jul 24, 2023
Incorrect emit for parameter properties when using standard class fields Open

Bug Domain: JS Emit Rescheduled

microsoft/TypeScript#55132 · 8 comments · 5 reactions · 1 assignee · Opened Jul 24, 2023
useUnknownForAnyReturn and useUnknownForAnyParam Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#55108 · 3 comments · 2 reactions · Opened Jul 22, 2023
When Invoking "Go To Implementation" For Parameters, Go To Arguments Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#55094 · 5 comments · Opened Jul 20, 2023
Enum value `1 / 0` incorrectly transformed if there is `Infinity` declared in scope Open

Bug Domain: enum Help Wanted

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

microsoft/TypeScript#55091 · 3 comments · 2 reactions · Opened Jul 20, 2023
Add flip operator refactoring Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#55071 · 1 comment · 5 reactions · Opened Jul 18, 2023
Incorrect errors reported if typeckecking only single file Open

Needs Investigation

microsoft/TypeScript#55069 · 1 reaction · 1 assignee · Opened Jul 18, 2023
Regression in `asserts` behavior modifying type of `this` Open

Needs Investigation

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

microsoft/TypeScript#55063 · 1 reaction · Opened Jul 18, 2023
`keyof T['prop']` becomes never when the object contains a context-sensitive function Open

Bug Domain: Indexed Access Types Help Wanted

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

microsoft/TypeScript#55039 · 5 comments · 1 reaction · Opened Jul 17, 2023
Discriminated union containing optional properties and generic types is not narrowed Open

Domain: check: Control Flow Possible Improvement

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

microsoft/TypeScript#55036 · 5 comments · 1 reaction · Opened Jul 16, 2023
auto import build-in node module with protocol prefix Open

Awaiting More Feedback Domain: LS: Auto-import Suggestion

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

microsoft/TypeScript#55051 · 10 reactions · Opened Jul 16, 2023
Module augmentation allows non-identical type parameters as long as there are defaults, but doesn't pass them Open

Bug Domain: Binder Help Wanted

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

microsoft/TypeScript#55026 · 2 reactions · Opened Jul 14, 2023
Module resolution using nodenext and a wildcard in package.json exports Open

Needs Investigation Rescheduled

microsoft/TypeScript#55021 · 7 comments · 26 reactions · 1 assignee · Opened Jul 14, 2023
Invalid type inference when using arrow function but normal functions is ok Open

Needs More Info

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

microsoft/TypeScript#55017 · 2 comments · Opened Jul 14, 2023
Using nullish coalescing with untyped field in constructor trigger TS7022 Open

Domain: check: Type Inference Help Wanted Possible Improvement

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

microsoft/TypeScript#55013 · 1 comment · Opened Jul 13, 2023
Importing a type with the same name as a namespace import, ideally alongside it Open

Awaiting More Feedback Suggestion

Difficulty 5/5 Over a week Newbie friendliness 28/100

microsoft/TypeScript#54990 · 5 comments · 6 reactions · Opened Jul 12, 2023

microsoft/TypeScript

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