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

ScriptKind.Deferred treated as LanguageVariant.Standard Open

Experimentation Needed Suggestion

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

microsoft/TypeScript#60125 · 9 comments · Opened Oct 3, 2024
Destructuring object with generic key should reject undefined Open

Bug Domain: check: Control Flow Help Wanted

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

microsoft/TypeScript#60119 · 2 reactions · Opened Oct 2, 2024
Thousands of false positives that seem to crash the TypeScript extension Open

Needs Investigation

microsoft/TypeScript#60117 · 1 assignee · Opened Oct 2, 2024
Regression Bug: Error "The type of this node cannot be serialized because its property '[fooSymbol]' cannot be serialized." happens but potentially avoidable automatically. Open

Needs Investigation

microsoft/TypeScript#60114 · 2 comments · 1 reaction · 1 assignee · Opened Oct 2, 2024
JSDoc with @extends, type parameter and member expression gives wrong dts output Open

Bug Domain: JSDoc Help Wanted

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

microsoft/TypeScript#60113 · 1 comment · Opened Oct 1, 2024
`isolatedModules` does not generate the same code Open

Docs

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

microsoft/TypeScript#60110 · Opened Oct 1, 2024
[Control flow] Array filter with typeguard works differently following array initial value Open

Domain: check: Control Flow Help Wanted Possible Improvement

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

microsoft/TypeScript#60108 · 1 comment · Opened Sep 30, 2024
undefined is narrowed away incorrectly Open

Bug Domain: check: Control Flow Help Wanted

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

microsoft/TypeScript#60106 · 3 comments · Opened Sep 30, 2024
A new generic type can be used for file path completion(intellisense) Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#60105 · 2 comments · 1 reaction · Opened Sep 30, 2024
Bug: null can be excluded by !== null in flow before typeof === 'object', but not excluded by predicate function. Open

Domain: check: Control Flow Help Wanted Possible Improvement

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

microsoft/TypeScript#60102 · Opened Sep 30, 2024
autoImportSpecifierExcludeRegexes needs a window refresh for changes to take effect Open

Needs Investigation

Difficulty 3/5 1-2 days Newbie friendliness 50/100

microsoft/TypeScript#60082 · 9 comments · 3 reactions · Opened Sep 27, 2024
Incomplete typecheck when assigning to a mapped object type with remapped keys Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#60070 · Opened Sep 26, 2024
Create flag strictVariableInitialization Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#60064 · 5 comments · 2 reactions · Opened Sep 25, 2024
Importing causes side effect of changing module resolution for transitive dependencies for other imports in 5.6 Open

Needs More Info

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

microsoft/TypeScript#60062 · 3 comments · 1 reaction · Opened Sep 25, 2024
Allow `satisfies` in string enum member initializers Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#60060 · 1 reaction · Opened Sep 25, 2024
Remove Map<any, any> constructor overload Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#60051 · 4 comments · 2 reactions · Opened Sep 24, 2024
Specialized error message when too new a lib is provided Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#60050 · 3 reactions · Opened Sep 24, 2024
Predicates break arbitrarily when intersected with some types. (Probably when the predicate is generic). Open

Bug Domain: Intersection Help Wanted

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

microsoft/TypeScript#60048 · Opened Sep 24, 2024
Function expression or method is not inferable when we have mapped type with a conditional type Open

Domain: check: Type Inference Help Wanted Possible Improvement

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

microsoft/TypeScript#60047 · 2 comments · Opened Sep 24, 2024
Inconsistent typechecking with require() in JS and TS Open

Has Repro Needs More Info

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

microsoft/TypeScript#60032 · 5 comments · 1 reaction · Opened Sep 23, 2024
IsolatedDeclarations: emitted declarations inconsistent between `transpileDeclaration` API and TypeScript Playground Open

Needs Investigation

microsoft/TypeScript#60031 · 2 comments · 1 assignee · Opened Sep 23, 2024
Proposal: Allow isolated declarations to infer results of constructor calls Open

Experimentation Needed Suggestion

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

microsoft/TypeScript#60010 · 10 comments · 2 reactions · Opened Sep 19, 2024
Interface that extends another no longer constrains types like the original Open

Bug Domain: check: Type Inference Help Wanted

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

microsoft/TypeScript#60008 · 1 comment · Opened Sep 19, 2024
Source mappings are missing for serialized properties Open

Bug Domain: Declaration Emit Help Wanted

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

microsoft/TypeScript#60004 · 2 reactions · Opened Sep 19, 2024
Potential memory leak or dead recursive during auto completion Open

Needs Investigation

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

microsoft/TypeScript#59998 · 2 comments · 1 reaction · Opened Sep 18, 2024
[suggest] constructor init delegation with "strictPropertyInitialization" Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#59997 · 2 comments · 1 reaction · Opened Sep 18, 2024
Cannot access protected field but private field inside nested class Open

Bug Domain: classes Help Wanted

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

microsoft/TypeScript#59989 · 1 comment · 1 reaction · Opened Sep 17, 2024
Computed type key inference inconsistent with identical explicitly declared type Open

Bug Domain: Mapped Types Help Wanted

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

microsoft/TypeScript#59987 · 2 comments · 1 reaction · Opened Sep 17, 2024
JsDoc with overloads and different generics results in wrong dts output Open

Bug Domain: JSDoc Help Wanted

Difficulty 3/5 1-2 days Newbie friendliness 68/100

microsoft/TypeScript#59980 · 2 comments · 1 reaction · Opened Sep 16, 2024
Inlay parameter hints don't account for trailing required parameters Open

7.0 LS Migration Bug Domain: LS: Inlay Hints Help Wanted

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

microsoft/TypeScript#59979 · 1 comment · 1 reaction · Opened Sep 16, 2024
Array of object unions not working as expected Open

Needs More Info

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

microsoft/TypeScript#59970 · 2 comments · Opened Sep 14, 2024
Type 'never' incorrectly inferred for mixed primitive type properties assignment with strictNullChecks disabled Open

Bug Domain: Indexed Access Types Help Wanted

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

microsoft/TypeScript#59969 · 2 comments · 1 reaction · Opened Sep 14, 2024
Error when accessing CSS property value using kebab case in `CSSStyleDeclaration` object Open

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

microsoft/TypeScript#59968 · 2 comments · 1 reaction · 2 assignees · Opened Sep 14, 2024
JSDoc typed function comments inside functions Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#59967 · 2 reactions · Opened Sep 14, 2024
super() typed as returning void Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#59959 · 2 comments · Opened Sep 13, 2024
(JSDoc, JavaScript) Imported class types by require() are unresolved Open

Needs Investigation

microsoft/TypeScript#59964 · 1 comment · 1 assignee · Opened Sep 13, 2024
TS 5.6 requires composite projects with noEmit to have fully accessible types, unlike 5.5 Open

Needs Investigation

microsoft/TypeScript#59951 · 7 comments · 3 reactions · 1 assignee · Opened Sep 12, 2024
Inconsistent behaviour of `-?` Open

Bug Domain: Mapped Types Help Wanted

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

microsoft/TypeScript#59948 · 8 comments · Opened Sep 12, 2024
Generators can return undefined values Open

Needs Investigation

microsoft/TypeScript#59947 · 1 comment · 1 reaction · 1 assignee · Opened Sep 12, 2024
Fail to infer Indexed access to the intersection type when it includes an union derived from a generic input Open

Domain: Indexed Access Types Help Wanted Possible Improvement

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

microsoft/TypeScript#59946 · 1 comment · Opened Sep 12, 2024
Generated d.ts imports package that is not installed on current project Open

Bug Domain: Declaration Emit Help Wanted

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

microsoft/TypeScript#59941 · 2 comments · Opened Sep 11, 2024
@import suggestions for auto-imports in VS Code Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#59935 · 1 comment · 11 reactions · Opened Sep 10, 2024
Missing Handbook Content Open

Docs

microsoft/TypeScript#59930 · 5 comments · 7 reactions · 1 assignee · Opened Sep 10, 2024
Improve Iterator Helper Type Signatures Open

Needs Investigation

microsoft/TypeScript#59926 · 10 comments · 1 reaction · 1 assignee · Opened Sep 10, 2024
Template literal type derived from string is not a subtype of the TLT derived from any Open

Domain: Literal Types Help Wanted Possible Improvement

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

microsoft/TypeScript#59925 · Opened Sep 10, 2024
function object parameter destructure field without default value will be ignored Open

Bug Domain: JavaScript

microsoft/TypeScript#59920 · 7 comments · 1 assignee · Opened Sep 10, 2024
Template Literal Types derived from the type keys cannot be used as Indexed Access Types in generic contexts Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#59909 · 3 comments · Opened Sep 9, 2024
function members of primitives/builtins are not read-only Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#59904 · 7 comments · 1 reaction · Opened Sep 9, 2024
Removing optional modifier in homomorphic mapped types does not work in generic contexts since 5.5.x Open

Bug Domain: Mapped Types

microsoft/TypeScript#59902 · 1 assignee · Opened Sep 9, 2024
[ServerErrors][TypeScript] 5.7.0-dev.20240904 vs 5.5.4 Open

Bug Domain: Crashes

microsoft/TypeScript#59900 · 18 comments · 1 assignee · Opened Sep 8, 2024

microsoft/TypeScript

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