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

ES `ClassDecoratorContext.name` has incorrect value with static `name` Open

Bug Domain: Decorators Help Wanted

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

microsoft/TypeScript#62870 · 2 comments · Opened Dec 9, 2025
Request for official prebuilt Windows binaries (tsgo.exe) published via GitHub Releases, without requiring npm. Open

Possible Improvement

microsoft/TypeScript#63790 · 7 comments · 1 assignee · Opened Dec 8, 2025
`__setFunctionName` breaks custom static `name` on classes Open

Bug Help Wanted

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

microsoft/TypeScript#62854 · 2 comments · Opened Dec 8, 2025
Inherited methods not merging JSDoc comments Open

Suggestion

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

microsoft/TypeScript#63789 · 6 comments · 1 reaction · Opened Dec 6, 2025
Consider deprecating `<prefix>` type assertions Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#62842 · 18 reactions · Opened Dec 5, 2025
Port `move to file` refactoring Open

Suggestion

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

microsoft/TypeScript#63788 · 6 reactions · Opened Dec 4, 2025
Update test framework mock paths during file rename operations Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#62835 · 2 comments · Opened Dec 4, 2025
Broken property suggestions due to a successfully contextually typed function Open

Bug

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

microsoft/TypeScript#63787 · 1 comment · 1 reaction · Opened Dec 3, 2025
Broken assignability and quick info due to erroneously deferring keyof T since #51621 Open

Bug

microsoft/TypeScript#63786 · 1 reaction · 1 assignee · Opened Dec 3, 2025
Completion does not work for generic type extending tuple or array of all partial type Open

Bug

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

microsoft/TypeScript#63785 · Opened Dec 3, 2025
Closing TS 6.0 LS issues Open

Discussion

Difficulty 5/5 Over a week Newbie friendliness 1/100

microsoft/TypeScript#62827 · 13 comments · 24 reactions · Opened Dec 2, 2025
`silentNeverType` leak through return type inference Open

Bug Domain: check: Type Inference Help Wanted

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

microsoft/TypeScript#62824 · 2 comments · Opened Dec 2, 2025
Support for `workspace/diagnostic` from LSP 3.17 Open

Needs Investigation

microsoft/TypeScript#63784 · 2 comments · 10 reactions · 1 assignee · Opened Nov 30, 2025
Spread operator fails to distribute over union when recursive type call is inlined instead of aliased Open

Bug Domain: Conditional Types Help Wanted

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

microsoft/TypeScript#62812 · 1 comment · Opened Nov 27, 2025
Self-referencing causes non-portable inferred types (TS2742) false positive Open

Needs Investigation

microsoft/TypeScript#62806 · 3 comments · 1 assignee · Opened Nov 26, 2025
`noUncheckedIndexedAccess` should forbid unsound `Record<string, string>` → `Record<"k", string>` coercion Open

Awaiting More Feedback Suggestion

Difficulty 4/5 3-5 days Newbie friendliness 52/100

microsoft/TypeScript#62796 · 7 comments · Opened Nov 23, 2025
Unbounded memory consumption with recursive conditional types causes compilation OOM Open

Possible Improvement

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

microsoft/TypeScript#63783 · 7 comments · 3 reactions · Opened Nov 19, 2025
Type parameter leak caused by `this` and reverse mapped type Open

Bug Domain: This-Typing Help Wanted

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

microsoft/TypeScript#62779 · 1 comment · Opened Nov 18, 2025
Inconsistent object literal key completion for enum keys Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#62778 · 4 comments · Opened Nov 18, 2025
"Lookup" Type Broken When Using Generics Open

Domain: Mapped Types Help Wanted Possible Improvement

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

microsoft/TypeScript#62770 · 3 comments · Opened Nov 17, 2025
Unexpected distributive behaviour on type alias Open

Needs Investigation

microsoft/TypeScript#62761 · 6 comments · 1 reaction · 1 assignee · Opened Nov 14, 2025
Strongly typed TypedArray values Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#62752 · 6 comments · 2 reactions · Opened Nov 13, 2025
Access base class protected methods in static block Open

Bug Domain: classes Help Wanted

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

microsoft/TypeScript#62738 · 6 comments · Opened Nov 9, 2025
Show incompatible union members in discriminated union discriminator errors Open

Experimentation Needed Help Wanted Suggestion

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

microsoft/TypeScript#62737 · 3 comments · 1 reaction · Opened Nov 8, 2025
Separate JSX/TSX from React and present it as a general XML-in-JS solution Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#62721 · 11 comments · Opened Nov 5, 2025
Inconsistencies in assignability rules around top-level-like signatures Open

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

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

microsoft/TypeScript#62712 · 2 comments · 3 reactions · Opened Nov 3, 2025
Recursive tuple cannot be computed through generic, but valid in a declarative form Open

Bug Domain: check: Type Circularity Help Wanted

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

microsoft/TypeScript#62704 · 2 comments · Opened Nov 1, 2025
Narrowing string down to a module specifier Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#62703 · 3 comments · Opened Nov 1, 2025
Support workspace specific typescript version Open

microsoft/TypeScript#63782 · 8 comments · 1 assignee · Opened Oct 24, 2025
Quick fix menu: default to most common import Open

Awaiting More Feedback Domain: LS: Auto-import Suggestion

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

microsoft/TypeScript#62667 · 2 comments · Opened Oct 23, 2025
Proposal: allow variance annotations on input positions Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#62639 · 4 comments · Opened Oct 20, 2025
Suggestion: make hover tooltips more readable by showing the generic parameters names instead of their value (in some cases).. Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#62634 · 3 comments · 1 reaction · Opened Oct 20, 2025
Suggestion: Distributive code inference "as dist" Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#62631 · 3 comments · Opened Oct 19, 2025
Allow classes to implement unions of object types Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#62630 · 17 comments · 4 reactions · Opened Oct 19, 2025
Plugin probe path starts in incorrect location? Open

Needs Investigation

microsoft/TypeScript#62618 · 2 comments · 1 assignee · Opened Oct 16, 2025
Compiler option to define output-to-input directory map for module resolution of package.json `"imports"`/`"exports"` Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#62591 · Opened Oct 13, 2025
The `@ts-ignore` vs. `@ts-expect-error` Dilemma: Missing a Warning-Only Redundancy Check Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#62579 · 3 comments · 5 reactions · Opened Oct 10, 2025
Array.from(it: Iterable<X> | Iterable<Y>) fails; […it] works but returns Array<X | Y>; both should return Array<X> | Array<Y> Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#62576 · 6 comments · Opened Oct 10, 2025
Destructuring all but one key dynamically via rest creates an unusable type by omitting all of its keys Open

Domain: Mapped Types Experimentation Needed Possible Improvement

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

microsoft/TypeScript#62572 · 3 comments · Opened Oct 9, 2025
Two consecutive variadic elements in the middle part of tuple type can't be recognized Open

Needs Investigation

microsoft/TypeScript#62561 · 3 comments · 1 assignee · Opened Oct 8, 2025
TS2742 “The inferred type of 'default' cannot be named” with ESLint `defineConfig` Open

Domain: Declaration Emit Help Wanted Possible Improvement

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

microsoft/TypeScript#62558 · 11 comments · 3 reactions · Opened Oct 7, 2025
`ts-ignore`: Allow specifying maximum typescript version Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#62555 · 2 comments · 1 reaction · Opened Oct 6, 2025
Incorrect report of self-referencing type for static fields Open

Domain: check: Type Inference Help Wanted Possible Improvement

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

microsoft/TypeScript#62552 · Opened Oct 6, 2025
Support lib: "baseline-widely-available" Open

Awaiting More Feedback Suggestion

Difficulty 5/5 Over a week Newbie friendliness 48/100

microsoft/TypeScript#62536 · 3 comments · 18 reactions · Opened Oct 3, 2025
Type instantiation for type level generic function Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#62524 · 4 comments · Opened Oct 2, 2025
Inconsistencies in ESM-style imports of accessibility-modified properties from CJS-exported classes Open

Bug Domain: ES Modules Help Wanted

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

microsoft/TypeScript#62519 · Opened Oct 1, 2025
Generic constraints are "shallow", don't account for depth subtyping Open

Docs

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

microsoft/TypeScript#62514 · 2 comments · Opened Sep 30, 2025
Discriminated union with 11+ items does not handle nullability same as union with <10 items Open

Bug Domain: check: Big Unions Help Wanted

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

microsoft/TypeScript#62511 · 3 comments · Opened Sep 29, 2025
6.0 Migration Guide Open

Discussion

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

microsoft/TypeScript#62508 · 31 comments · 66 reactions · Opened Sep 29, 2025
Type hinting remains slow after version 5.9.2 Open

Needs More Info

Difficulty 4/5 3-5 days Newbie friendliness 28/100

microsoft/TypeScript#62484 · 8 comments · Opened Sep 25, 2025

microsoft/TypeScript

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