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: 1d 19h
Merged PRs (30d): 117

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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4,855 open issues indexed

Typescript type hint problem Open

Needs More Info

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

microsoft/TypeScript#60725 · 8 comments · Opened Nov 6, 2024
Syntactic checks against comparing to null/undefined in strictNullChecks mode Open

Experimentation Needed Suggestion

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

microsoft/TypeScript#60425 · 7 comments · 3 reactions · Opened Nov 5, 2024
Paste with imports duplicates imports for namespace imports Open

Needs Investigation

microsoft/TypeScript#60419 · 1 comment · 1 assignee · Opened Nov 5, 2024
'Move to a new file' operation reformats code (typescript) Open

Needs More Info

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

microsoft/TypeScript#60414 · 3 comments · Opened Nov 4, 2024
Does not find .mts file when doing extensionless import and Bundler Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#60409 · 2 comments · Opened Nov 4, 2024
When using typeof for the interface, it is hoped that the jsdoc comments of the expression can inherit typeof by default Open

Experience Enhancement Help Wanted Suggestion

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

microsoft/TypeScript#60403 · Opened Nov 4, 2024
VSCode auto-import ignores typescript.preferences.importModuleSpecifierEnding when using a path from the package.json imports Open

Needs More Info

Difficulty 3/5 1-2 days Newbie friendliness 42/100

microsoft/TypeScript#60423 · 3 comments · 6 reactions · Opened Nov 2, 2024
[Regression] Failed to assign to a discriminated union class property when its type is inferred from constructor Open

Bug Domain: check: Type Inference Help Wanted

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

microsoft/TypeScript#60394 · 1 comment · Opened Nov 2, 2024
Detect Typescript in Javascript editors opened and inform developer, that he is writing different syntax and it will silently fail (probably) Open

Needs More Info

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

microsoft/TypeScript#60428 · 1 comment · 1 reaction · Opened Nov 1, 2024
Strange 2488 error involving overload resolution and this parameter type Open

Needs Investigation

microsoft/TypeScript#60374 · 1 assignee · Opened Oct 30, 2024
Using JSX syntax in a namespace may incorrectly use the exported members of the current namespace as intrinsic elements (starting with a lowercase letter) Open

Bug Domain: JSX/TSX Help Wanted

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

microsoft/TypeScript#60365 · Opened Oct 29, 2024
Should validate iteree when using `using`/`await using` in loop initializer Open

Needs Investigation

microsoft/TypeScript#60348 · 3 reactions · 1 assignee · Opened Oct 26, 2024
Regular Expression - improve on-hover notation for literal expressions Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#60344 · 1 comment · Opened Oct 26, 2024
TypeScript skips type-checking despite deleted file in referenced project Open

Bug Domain: tsc -b

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

microsoft/TypeScript#60335 · 1 comment · Opened Oct 24, 2024
Invalid import path rewrite in declaration file Open

Bug Domain: Declaration Emit Help Wanted

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

microsoft/TypeScript#60331 · 3 reactions · Opened Oct 23, 2024
[playground] Show transpiled output for JavaScript inputs Open

Bug Domain: JavaScript Website

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

microsoft/TypeScript#60330 · 2 comments · Opened Oct 23, 2024
bug: error message says 0n is truthy Open

Bug Domain: check: Control Flow

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

microsoft/TypeScript#60320 · 1 comment · 1 reaction · Opened Oct 22, 2024
Type discrimination by static readonly symbol Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#60318 · Opened Oct 22, 2024
JSDoc `@import` no longer works correctly with default exports Open

Needs Investigation Needs More Info

microsoft/TypeScript#60317 · 4 comments · 2 reactions · 1 assignee · Opened Oct 22, 2024
Mixin with abstract class infers wrong type for super Open

Bug Domain: classes Help Wanted

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

microsoft/TypeScript#60315 · 1 comment · 2 reactions · Opened Oct 22, 2024
Seeking Guidance: Significant performance regression within editor when upgrading typescript versions in large monorepo Open

Needs Investigation

microsoft/TypeScript#60311 · 5 comments · 2 reactions · 1 assignee · Opened Oct 22, 2024
Can extends [any, any] but not generic which is exactly [any, any] (woks till 5.3.3 breaks from 5.4.5) Open

Bug Domain: check: Type Inference

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

microsoft/TypeScript#60299 · 4 comments · Opened Oct 21, 2024
Cannot reassign undefined to the parameter of a function parameter destructuring with default value Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#60279 · 1 comment · Opened Oct 18, 2024
Formatting Intellisense For Better JS/TS Doc Integration Open

Experience Enhancement Suggestion

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

microsoft/TypeScript#60300 · 1 comment · 2 reactions · Opened Oct 18, 2024
TypeError: Cannot read properties of undefined (reading 'length') at elaborateDidYouMeanToCallOrConstruct Open

Needs More Info

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

microsoft/TypeScript#60278 · 7 comments · Opened Oct 18, 2024
Add a new type of class declaration to support mixins Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#60254 · 7 comments · 1 reaction · Opened Oct 17, 2024
NoInfer breaks discriminate union autocomplete Open

Experience Enhancement Suggestion

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

microsoft/TypeScript#60253 · Opened Oct 17, 2024
Incorrect static method overload inheritance between TypeScript and JavaScript with JSDoc Open

Bug Domain: JSDoc Help Wanted

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

microsoft/TypeScript#60242 · Opened Oct 16, 2024
Infinite type instantiation around recursive conditional types Open

Bug Domain: check: Type Circularity Help Wanted

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

microsoft/TypeScript#60237 · 1 comment · 1 reaction · Opened Oct 15, 2024
Certain homomorphic mappings break assignability with exactOptionalPropertyTypes Open

Domain: flag: exactOptionalPropertyTypes Help Wanted Possible Improvement

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

microsoft/TypeScript#60233 · 2 comments · Opened Oct 15, 2024
`keyof Readonly<string[]>` different from `keyof Readonly<T>` where T is string[] Open

Needs Investigation

microsoft/TypeScript#60231 · 1 comment · 1 assignee · Opened Oct 15, 2024
Using types from private class properties results in `any` types in `.d.ts` files Open

Bug Domain: Declaration Emit

microsoft/TypeScript#60230 · 4 comments · 2 reactions · 1 assignee · Opened Oct 15, 2024
Typescript 5.6.3 throwing error "The inferred type of X cannot be named without a reference to Y. This is likely not portable. A type annotation is necessary." Open

Needs More Info

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

microsoft/TypeScript#60214 · 4 comments · Opened Oct 13, 2024
Capitalize and Uncapitalized are implemented multiple times Open

Infrastructure

Difficulty 3/5 1-2 days Newbie friendliness 42/100

microsoft/TypeScript#60206 · Opened Oct 12, 2024
Allow decorated accessor properties to have a different type Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#60200 · 2 comments · 6 reactions · Opened Oct 11, 2024
TS 5.6 `files` missing from `--showConfig` (with absolute / ``${configDir}`` `include` paths) Open

Domain: Something Else Possible Improvement

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

microsoft/TypeScript#60199 · 4 comments · Opened Oct 11, 2024
Indicate in the editor that a type is explicitly `any` Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#60189 · 2 comments · 9 reactions · Opened Oct 10, 2024
Regression: incorrect return type when disabled strictNullChecks Open

Domain: check: Type Inference Help Wanted Possible Improvement

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

microsoft/TypeScript#60187 · Opened Oct 10, 2024
Completion should suggest enum keys on some conditions Open

Awaiting More Feedback Domain: LS: Completion Lists Suggestion

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

microsoft/TypeScript#60184 · 1 reaction · Opened Oct 10, 2024
Uninitialized local check still permits provably erroneous use-before-assign in closure Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#60181 · 5 comments · 2 reactions · Opened Oct 9, 2024
Destructuring a possibly `undefined` object not caught, throws an error at runtime Open

Bug Domain: check: Control Flow Help Wanted

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

microsoft/TypeScript#60179 · 3 comments · 1 reaction · Opened Oct 9, 2024
Array.isArray() : a possible fix ? + discussion on type guards (frozen keyword + better type deduction) Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#60177 · 2 comments · 3 reactions · Opened Oct 9, 2024
Iterator Helpers: `return` method typing is weaker than ideal Open

Awaiting More Feedback Suggestion

Difficulty 2/5 1-3 hours Newbie friendliness 58/100

microsoft/TypeScript#60176 · 1 reaction · Opened Oct 9, 2024
VSCode errors when refactoring JavaScript to new file Open

Needs More Info

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

microsoft/TypeScript#60180 · 7 comments · 8 reactions · Opened Oct 8, 2024
Ability to pick setter types (instead of getter types) in a mapped type Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#60162 · 3 comments · 5 reactions · Opened Oct 7, 2024
`asserts this is T` does not narrow type of `this` Open

Cursed? Domain: This-Typing Possible Improvement

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

microsoft/TypeScript#60140 · 11 comments · Opened Oct 4, 2024
Improve module resolution using "paths" of "tsconfig.json" file Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#60133 · Opened Oct 3, 2024
Assertion signature on generics doesn't narrow Open

Bug Domain: check: Control Flow Help Wanted

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

microsoft/TypeScript#60130 · 13 comments · Opened Oct 3, 2024
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

microsoft/TypeScript

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