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

Beginner friendly Everything

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4,862 open issues indexed

Feature request: set JS output indentation to 2 in next major release Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#54632 · 10 comments · 23 reactions · Opened Jun 13, 2023
Type argument inference fails using partial generic type when it should be possible Open

Domain: check: Type Inference Possible Improvement

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

microsoft/TypeScript#54622 · 3 comments · Opened Jun 12, 2023
Unexpected ASI after `declare` (regression since version 4.4) Open

Bug Domain: Parser Rescheduled

microsoft/TypeScript#54602 · 1 comment · 1 reaction · 1 assignee · Opened Jun 10, 2023
Dual ESM/CJS emit with tsc Open

In Discussion Suggestion

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

microsoft/TypeScript#54593 · 26 comments · 24 reactions · Opened Jun 9, 2023
ES6 Class: `asserts this is Type` raises error when variable containing instance is type narrowed Open

Domain: This-Typing Help Wanted Possible Improvement

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

microsoft/TypeScript#54591 · 1 comment · Opened Jun 9, 2023
Missing arguments in a callback function within a decorator result in error Open

Needs Investigation

microsoft/TypeScript#54587 · 1 assignee · Opened Jun 9, 2023
Mapped Type `[Lhs of Rhs]` Syntax for Array and Tuple Types Open

In Discussion Suggestion

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

microsoft/TypeScript#54575 · 2 comments · 3 reactions · Opened Jun 8, 2023
Using `"allowJs": true` and `"module": "commonjs"` to transform `.mjs` files should emit `.cjs` files Open

Domain: Node ESM Possible Improvement

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

microsoft/TypeScript#54573 · 12 comments · 4 reactions · Opened Jun 8, 2023
`.then(onresolved)`'s return type should not be inferred from contextual type Open

Domain: lib.d.ts Possible Improvement

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

microsoft/TypeScript#54551 · 1 comment · 1 reaction · Opened Jun 6, 2023
Generic Tuple Optional Parameter spread errors with Type instantiation is excessively deep and possibly infinite. ts(2589) Open

Domain: Conditional Types Possible Improvement

Difficulty 4/5 3-5 days Newbie friendliness 30/100

microsoft/TypeScript#54550 · 1 comment · Opened Jun 6, 2023
Typedef of object with generic property fails since 5.1 Open

Needs Investigation

microsoft/TypeScript#54544 · 4 comments · 1 assignee · Opened Jun 5, 2023
Overloaded function args not inferred correctly Open

Domain: check: Type Inference Help Wanted Possible Improvement

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

microsoft/TypeScript#54539 · 7 comments · 8 reactions · Opened Jun 5, 2023
declarations file of extended class type is needlessly verbose (excessively deep) Open

Needs Investigation Rescheduled

microsoft/TypeScript#54533 · 1 comment · 1 assignee · Opened Jun 5, 2023
OOME/Excessively deep type on upgrade from 4.9.4 to 5.x, introduced in 5.0.0-dev.20230203 Open

Needs Investigation

microsoft/TypeScript#54517 · 9 comments · 6 reactions · 1 assignee · Opened Jun 4, 2023
Extend Watchfile options to allow for watching some files with higher priority. Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#54511 · Opened Jun 3, 2023
6.0 Deprecation List Open

Discussion

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

microsoft/TypeScript#54500 · 63 comments · 56 reactions · Opened Jun 2, 2023
Per-decorator opt-in for type metadata emit Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#54493 · 1 comment · Opened Jun 2, 2023
`satisfies` should work with imported / referenced values Open

In Discussion Suggestion

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

microsoft/TypeScript#54488 · 26 comments · 3 reactions · Opened Jun 1, 2023
FAQ broken link Open

Docs

Difficulty 1/5 Under an hour Newbie friendliness 55/100

microsoft/TypeScript#54468 · 3 comments · 1 reaction · Opened May 31, 2023
Support splitting transpilation into a worker in tsc Open

In Discussion Suggestion

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

microsoft/TypeScript#54461 · 8 comments · 3 reactions · Opened May 30, 2023
Handbook should recommend using a user-defined homomorphic `Omit` Open

Docs

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

microsoft/TypeScript#54451 · 5 comments · 12 reactions · Opened May 30, 2023
Move to file changes paths based import to relative import Open

Needs Investigation Rescheduled

microsoft/TypeScript#56784 · 1 comment · 1 assignee · Opened May 30, 2023
TS2401 does not work with `"target": "ESNext"` Open

Bug Domain: classes Help Wanted

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

microsoft/TypeScript#54445 · 5 comments · 3 reactions · Opened May 29, 2023
Unexpected "used before its declaration" error when implementing a exported type of a merged namespace Open

Bug Domain: Binder Help Wanted Needs Human Review Needs More Info

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

microsoft/TypeScript#54429 · 1 comment · Opened May 28, 2023
Report evolving arrays / evolving variables differently in QuickInfo Open

Experience Enhancement Help Wanted Suggestion

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

microsoft/TypeScript#54414 · 9 comments · 11 reactions · Opened May 26, 2023
Add option to include files in type checking, but not compiling Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#54410 · 3 comments · 35 reactions · Opened May 26, 2023
Generating declaration file (.d.ts) for a single module Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#54408 · 1 comment · Opened May 26, 2023
Narrowed generic type is ignored in return type of callback passed to generic function Open

Bug Domain: check: Type Inference Help Wanted

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

microsoft/TypeScript#54405 · 1 comment · Opened May 26, 2023
Spread operator mixed with destructuring assignment resulting in unsoundness Open

Domain: flag: noUncheckedIndexedAccess Help Wanted Possible Improvement

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

microsoft/TypeScript#54402 · 3 comments · Opened May 25, 2023
Notes about `String.replace` Open

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

microsoft/TypeScript#54387 · 5 comments · 3 reactions · 2 assignees · Opened May 25, 2023
`autocapitalize` type is incorrect according to MDN Open

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

microsoft/TypeScript#54372 · 10 comments · 1 reaction · 2 assignees · Opened May 24, 2023
Omitting a property from tuple breaks destruction Open

Bug Domain: Mapped Types Help Wanted

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

microsoft/TypeScript#54371 · 17 comments · Opened May 24, 2023
Suggesion: Allow recursive/self-references in `satisfies` constraint Open

Domain: Something Else Possible Improvement

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

microsoft/TypeScript#54367 · 6 comments · 5 reactions · Opened May 24, 2023
Better error reporting Open

Needs Proposal Suggestion

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

microsoft/TypeScript#54357 · 2 comments · Opened May 23, 2023
Comment referencing an undefined `ClassDecoratorFunction` type Open

Bug Docs Domain: Decorators Help Wanted Needs Human Review

Difficulty 1/5 Under an hour Newbie friendliness 50/100

microsoft/TypeScript#54338 · 1 comment · 4 reactions · Opened May 21, 2023
Generic typing used for "input" event listeners Open

Domain: lib.d.ts Help Wanted Possible Improvement

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

microsoft/TypeScript#54336 · 3 comments · 2 reactions · Opened May 21, 2023
Type inference for `Function.call` return type on generic functions Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#54319 · Opened May 18, 2023
Need an option for ignore error when emit declaration Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#54305 · 8 comments · 3 reactions · Opened May 18, 2023
Tuple with optional element and exactOptionalPropertyTypes still returns undefined during iteration Open

Bug Domain: flag: exactOptionalPropertyTypes Help Wanted

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

microsoft/TypeScript#54302 · 1 reaction · Opened May 18, 2023
Autocompletion is not working for TypeScript paths alias in import statements when omitting "baseUrl" Open

Needs Investigation Rescheduled

microsoft/TypeScript#54295 · 1 assignee · Opened May 17, 2023
Possible performance improvement around types with `this` argument Open

Domain: Performance Help Wanted Possible Improvement

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

microsoft/TypeScript#54260 · 2 comments · 13 reactions · Opened May 16, 2023
Named/keyed type parameters Open

In Discussion Suggestion

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

microsoft/TypeScript#54254 · 21 comments · 100 reactions · Opened May 15, 2023
Type inference behaves unexpectedly when dealing with functions that have type parameters Open

Domain: check: Type Inference Help Wanted Possible Improvement

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

microsoft/TypeScript#54251 · Opened May 15, 2023
Reduce overhead and indirection in enum and namespace code generation Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#54244 · 7 comments · 2 reactions · Opened May 14, 2023
Accessors should be allowed to be optional Open

In Discussion Suggestion

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

microsoft/TypeScript#54240 · 9 comments · 21 reactions · Opened May 13, 2023
Type guard/Equality narrowing doesn't work on "any" Open

Domain: check: Control Flow Possible Improvement

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

microsoft/TypeScript#54239 · 2 comments · Opened May 13, 2023
Reusing nodeLinks and symbolLinks Open

Experimentation Needed Suggestion

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

microsoft/TypeScript#54234 · 3 comments · Opened May 13, 2023
Incremental Binding Open

Experimentation Needed Help Wanted Suggestion

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

microsoft/TypeScript#54222 · 2 comments · Opened May 12, 2023
`infer` not returning expected inner type if another inner type is used in the outer type result Open

Domain: Conditional Types Possible Improvement

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

microsoft/TypeScript#54213 · 3 comments · Opened May 10, 2023
Proposal: Encode and read emit-affecting compiler options in declaration files Open

Domain: Declaration Emit In Discussion Suggestion

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

microsoft/TypeScript#54212 · 1 comment · 1 reaction · Opened May 10, 2023

microsoft/TypeScript

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