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

Allow `--noCheck` on the CLI with top-level `--build` Open

Domain: tsc -b Experience Enhancement

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

microsoft/TypeScript#58336 · 2 reactions · Opened Apr 26, 2024
Trivia ownership documentation seems to be incorrect Open

Docs

Difficulty 1/5 Under an hour Newbie friendliness 48/100

microsoft/TypeScript#58332 · Opened Apr 26, 2024
Auto-closing of tags within curly braces `{}` does not work when parent element is same tag in JSX Open

Bug Domain: JSX/TSX Help Wanted Needs Human Review Needs More Info

Difficulty 4/5 3-5 days Newbie friendliness 50/100

microsoft/TypeScript#58322 · 2 comments · Opened Apr 26, 2024
Allow overload signatures to have different access levels Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#58316 · 3 comments · Opened Apr 25, 2024
TypeScript language service cannot find subclass references/implementation of mixin methods Open

Experience Enhancement Help Wanted Suggestion

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

microsoft/TypeScript#58307 · Opened Apr 24, 2024
Type inference lost after spreading array with `ArrayLike` Open

Domain: check: Type Inference Help Wanted Possible Improvement

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

microsoft/TypeScript#58286 · 2 comments · 1 reaction · Opened Apr 22, 2024
Add a flag to require JS object literals to be initialized with all declared members Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#58284 · 4 comments · Opened Apr 22, 2024
Document link for reference types and path Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#58281 · Opened Apr 22, 2024
TS2590: Expression produces a union type that is too complex to represent, with simple file using Tuples Open

Domain: check: Big Unions Help Wanted Possible Improvement

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

microsoft/TypeScript#58268 · 7 comments · Opened Apr 21, 2024
Enable `allowJs` with `isolatedDeclarations` Open

Experience Enhancement

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

microsoft/TypeScript#58262 · 6 comments · 21 reactions · Opened Apr 19, 2024
Add option to detect and strip internal exports Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#58250 · 3 reactions · Opened Apr 19, 2024
`satisfies` does not work on a variable called `type` Open

Bug Domain: Parser Help Wanted

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

microsoft/TypeScript#58248 · 1 reaction · Opened Apr 19, 2024
Documentation: "Creating and Printing a TypeScript AST" example does not work after v4.9.5 Open

Docs

microsoft/TypeScript#58247 · 2 reactions · 1 assignee · Opened Apr 19, 2024
Add Support for Flow's new component syntax Open

In Discussion Suggestion

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

microsoft/TypeScript#58246 · 9 comments · 9 reactions · Opened Apr 19, 2024
C++-style `const` modifier on class members Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#58236 · 9 comments · 1 reaction · Opened Apr 18, 2024
Narrowing empty string or false in generic misbehaves Open

Domain: check: Control Flow Help Wanted Possible Improvement

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

microsoft/TypeScript#58232 · 2 comments · Opened Apr 17, 2024
Assigning a @type to an async function emits an error Open

Bug Domain: JSDoc Help Wanted

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

microsoft/TypeScript#58215 · 1 comment · 1 reaction · Opened Apr 16, 2024
WebGL(2) context methods don't allow null for resource parameters Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#58200 · 2 comments · Opened Apr 15, 2024
[NewErrors] 5.5.0-dev.20240414 vs 5.4.5 Open

Committed

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

microsoft/TypeScript#58189 · 30 comments · Opened Apr 14, 2024
Proposal: Type-side use of `instanceof` keyword as an instance-query to allow instanceof checking Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#58181 · 7 comments · 9 reactions · Opened Apr 13, 2024
Declaration emit of private properties should strip jsdoc Open

Bug Domain: Declaration Emit Help Wanted

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

microsoft/TypeScript#58145 · 1 comment · 3 reactions · Opened Apr 10, 2024
Type literals in declaration files are emitted with comment blocks from the wrong source file Open

Domain: Comment Emit Needs Investigation

microsoft/TypeScript#58143 · 7 reactions · 1 assignee · Opened Apr 10, 2024
"Output generation failed" when transpiling "test.d.abc.ts" Open

Domain: Error Messages Experience Enhancement Suggestion

Difficulty 2/5 1-3 hours Newbie friendliness 52/100

microsoft/TypeScript#58142 · 4 comments · Opened Apr 10, 2024
Incorrect Chinese Translation for 'initializer' and Incorrect Use of Chinese Quotation Marks Open

Bug Domain: Something Else

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

microsoft/TypeScript#58130 · Opened Apr 9, 2024
Preserve `set`-only accessors in declaration emit Open

In Discussion Suggestion

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

microsoft/TypeScript#58119 · 6 reactions · Opened Apr 8, 2024
No error when accessing setter-only properties Open

In Discussion Suggestion

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

microsoft/TypeScript#58112 · 2 comments · 1 reaction · Opened Apr 8, 2024
Too wide diagnostic with array spread Open

Bug Domain: Related Error Spans

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

microsoft/TypeScript#58110 · 1 comment · Opened Apr 8, 2024
Function lacks ending return statement and return type does not include 'undefined' Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#58099 · 6 comments · Opened Apr 7, 2024
Import ellision emit bug: usage of imports only in keys of interfaces does not result in those imports being elided as type-only Open

Bug Domain: JS Emit Help Wanted

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

microsoft/TypeScript#58081 · Opened Apr 4, 2024
Add option to throw error when `!` (NonNull expression) is used on a non-nullish expression Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#58072 · 3 comments · 8 reactions · Opened Apr 4, 2024
Array prototype extensions fail circularly with `...args: T[]`, but not `args: T[]` Open

Domain: check: Type Circularity Possible Improvement

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

microsoft/TypeScript#58068 · 6 comments · Opened Apr 3, 2024
Shorten error spans for missing key errors reported on object literals Open

Needs Proposal Suggestion

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

microsoft/TypeScript#58062 · 3 comments · 1 reaction · Opened Apr 3, 2024
[RFC] Code Prompts, a Prompt Format for AI-Powered Code Auto-Completion Open

Experiment In Discussion Suggestion

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

microsoft/TypeScript#58024 · 7 comments · 28 reactions · Opened Apr 1, 2024
Shorter tuple inference gets picked over longer inference when both come from rests Open

Domain: check: Type Inference Help Wanted Possible Improvement

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

microsoft/TypeScript#57981 · 1 comment · Opened Mar 28, 2024
Allow non-polymorphic ("private") extension of base classes Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#57979 · 5 comments · 1 reaction · Opened Mar 28, 2024
Update import/export specifier sort on rename Open

Experience Enhancement Help Wanted Suggestion

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

microsoft/TypeScript#57975 · 7 comments · 1 reaction · Opened Mar 27, 2024
Go-to-definition should only show relevant definitions when value & type have same name Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#57959 · 6 comments · 3 reactions · Opened Mar 27, 2024
A Pragmatic, Not-Really-Typed Errors Proposal Open

In Discussion Suggestion

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

microsoft/TypeScript#57943 · 17 comments · 54 reactions · Opened Mar 26, 2024
[ServerErrors][TypeScript] 5.5.0-dev.20240324 Open

Bug Domain: Something Else

microsoft/TypeScript#57923 · 7 comments · 1 assignee · Opened Mar 24, 2024
Intersection type in template literal is not reduced to its bare type Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#57918 · 12 comments · Opened Mar 23, 2024
Improve comparable relation of template literal types to detect more impossible situations Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#57872 · 5 comments · Opened Mar 21, 2024
Improve error position/range for arrow functions with expression body Open

Domain: Error Messages Experience Enhancement Help Wanted Suggestion

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

microsoft/TypeScript#57866 · 8 comments · 1 reaction · Opened Mar 20, 2024
Add missing awaits when destructuring properties from a promisified type Open

Experience Enhancement Help Wanted Suggestion

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

microsoft/TypeScript#57831 · 2 comments · Opened Mar 18, 2024
`Extract` not narrowing type union in mapped type passed as generic Open

Needs Investigation

microsoft/TypeScript#57827 · 6 comments · 1 assignee · Opened Mar 18, 2024
Default type imported with `import type` from not-found module not flagged when used as a value Open

Bug Domain: Binder Help Wanted

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

microsoft/TypeScript#57820 · 3 comments · Opened Mar 18, 2024
Remove `@type` tag from hover info Open

Experience Enhancement Help Wanted Suggestion

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

microsoft/TypeScript#57819 · 2 reactions · Opened Mar 18, 2024
Assignment narrowing failing to reset in a loop with optional chaining Open

Bug Domain: check: Control Flow Help Wanted

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

microsoft/TypeScript#57816 · 3 comments · 1 reaction · Opened Mar 17, 2024
TypeScript right adapt constructor Open

Needs More Info

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

microsoft/TypeScript#57812 · 2 comments · Opened Mar 17, 2024
Command clicking FC's in react doesn't work anymore. Open

Needs More Info

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

microsoft/TypeScript#57865 · 9 comments · 1 reaction · Opened Mar 16, 2024
TS doesn't narrow generic parameter T to null, despite an explicit comparison Open

Domain: check: Control Flow Possible Improvement

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

microsoft/TypeScript#57803 · 5 comments · 1 reaction · Opened Mar 16, 2024

microsoft/TypeScript

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