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: 18
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

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4,857 issues indexed so far

Treat `expr satisfies never;` similarly to a call to a never-returning function in CFA Open

In Discussion Suggestion

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

microsoft/TypeScript#61004 · 9 comments · 25 reactions · Opened Jan 21, 2025
Allow interface merging for DecoratorMetadataObject and parameterization by This Open

Needs Investigation

microsoft/TypeScript#60997 · 2 reactions · 1 assignee · Opened Jan 19, 2025
Static method on abstract class with generic this parameter causes "excessively deep" error when called on concrete class Open

Domain: check: Type Circularity Help Wanted Possible Improvement

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

microsoft/TypeScript#60992 · Opened Jan 17, 2025
Branded string literals revert to `string` in some cases Open

Domain: Literal Types Help Wanted Possible Improvement

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

microsoft/TypeScript#60990 · 1 comment · 3 reactions · Opened Jan 17, 2025
JSDoc recursive inference not working properly on generic array wrapping Open

Domain: JSDoc Help Wanted Possible Improvement

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

microsoft/TypeScript#60988 · Opened Jan 17, 2025
Accessing protected computed property does not produce a compiler error Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#60974 · 7 comments · 1 reaction · Opened Jan 15, 2025
`builder.getDeclarationDiagnostics` performance regression since 5.6 Open

Needs Investigation

microsoft/TypeScript#60970 · 1 comment · 13 reactions · 1 assignee · Opened Jan 14, 2025
Extend the tsc --listFiles option to specify an output file for the list Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#60966 · 4 comments · Opened Jan 13, 2025
Getting a setter-only property is typed as the setter's parameter's type instead of undefined Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#60954 · 9 comments · 1 reaction · Opened Jan 12, 2025
'identity' modifier to indicate a function's parameter-less returns should be narrowed like a value Open

Needs More Info

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

microsoft/TypeScript#60948 · 39 comments · 136 reactions · Opened Jan 10, 2025
Log which project is being checked. Open

Needs More Info

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

microsoft/TypeScript#60942 · 2 comments · Opened Jan 9, 2025
`String.prototype.split()` with a regex containing a capturing group can return an array of `string | undefined`. Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#60941 · 6 comments · Opened Jan 9, 2025
error TS2835 suggests `.js` extension when `rewriteRelativeImportExtensions` is enabled Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#60926 · 6 reactions · Opened Jan 7, 2025
Request: Way to target Compound Components (eg. React) in a theme specifically. (<MyComponent.*>) Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#62040 · 1 comment · Opened Jan 6, 2025
Unary minus on 'any' should infer type to 'number | bigint', not just 'number' Open

In Discussion Suggestion

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

microsoft/TypeScript#60914 · 3 comments · 3 reactions · Opened Jan 5, 2025
`./*.d.ts` required in `exports` to avoid `Cannot be named without a reference to... not portable...` Open

Needs Investigation

microsoft/TypeScript#60913 · 12 comments · 3 reactions · 1 assignee · Opened Jan 5, 2025
Extend JSDoc @this to JavaScript class - apply @this to every non-static method Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#62041 · 1 reaction · Opened Jan 3, 2025
Mechanism for late inferred types in control flow analysis Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#60907 · 2 comments · Opened Jan 2, 2025
Compilation option: `stricterPropertyInitialization` Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#60906 · 3 comments · Opened Jan 2, 2025
Cache Declarations Directory Open

Needs Proposal Suggestion

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

microsoft/TypeScript#60905 · 2 comments · Opened Jan 2, 2025
Compiler option to switch lib .d.ts `any`s to `unknown` Open

Needs Proposal Suggestion

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

microsoft/TypeScript#60899 · 3 comments · 17 reactions · Opened Jan 2, 2025
Type parameter not usable as type argument in identical type; union in constraint becomes intersection Open

Bug Domain: Indexed Access Types Help Wanted

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

microsoft/TypeScript#60892 · 1 comment · Opened Dec 31, 2024
Allow dynamic usage of `import = require` syntax Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#60884 · 5 comments · 2 reactions · Opened Dec 30, 2024
private fields in nested classes should have separate types? Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#60882 · 3 comments · Opened Dec 30, 2024
misleading error message on invalid assignment when one type parameter extends another Open

Domain: Error Messages Help Wanted Possible Improvement

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

microsoft/TypeScript#60881 · Opened Dec 30, 2024
Generic syntax ambiguity is handled incorrectly Open

Bug Domain: Parser Help Wanted

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

microsoft/TypeScript#60874 · 1 comment · 1 reaction · Opened Dec 29, 2024
Possible regression of intersection type inference in 5.7.2 compared to 5.6.3 Open

Domain: check: Type Inference Help Wanted Possible Improvement

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

microsoft/TypeScript#60864 · 2 comments · Opened Dec 27, 2024
lib.dom: DOMatrix constructor accepts TypedArrays, not only Arrays. Open

Bug Domain: lib.d.ts Help Wanted

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

microsoft/TypeScript#60862 · 2 comments · Opened Dec 27, 2024
Typed Object.entries/Object.fromEntries - Or Type Utility to infer Unions with matching length so that a new type safe object can be made Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#60859 · 4 comments · 3 reactions · Opened Dec 26, 2024
Cannot export both types and values from CJS Open

In Discussion Suggestion

microsoft/TypeScript#60852 · 2 comments · 1 reaction · 1 assignee · Opened Dec 25, 2024
Incorrect type returned by TextEncoder.encode Open

Bug Domain: lib.d.ts Help Wanted

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

microsoft/TypeScript#60846 · 3 comments · 3 reactions · Opened Dec 23, 2024
Inconsistent types between Document scrollingElement and documentElement Open

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

microsoft/TypeScript#60838 · 1 comment · 1 reaction · 2 assignees · Opened Dec 22, 2024
TypeScript slow project load times for large projects on MacOS Open

Needs Investigation

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

microsoft/TypeScript#60832 · 7 comments · 13 reactions · Opened Dec 20, 2024
Computed property type is invalid in type emitted if it is a unique symbol coming from a property that has a space in the name Open

Bug Domain: Declaration Emit Help Wanted

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

microsoft/TypeScript#60823 · 1 comment · Opened Dec 19, 2024
if-statements allow multiple arguments and don't check for constant conditions after the first argument Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#60822 · 8 comments · Opened Dec 19, 2024
Bug: settings in `tsconfig.json#paths` and `package.json#imports` conflicts Open

Bug Domain: Module Resolution Help Wanted

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

microsoft/TypeScript#60821 · 3 comments · 1 reaction · Opened Dec 19, 2024
Computed property name is not escaped in declaration emit Open

Bug Domain: Declaration Emit

microsoft/TypeScript#60819 · 1 assignee · Opened Dec 19, 2024
Computed property invalid in type declaration emitted in d.ts file Open

Domain: Declaration Emit Help Wanted Possible Improvement

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

microsoft/TypeScript#60818 · Opened Dec 19, 2024
tsc looses trailing comments in the produced js files Open

Domain: Comment Emit Help Wanted Possible Improvement

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

microsoft/TypeScript#60811 · 1 comment · 1 reaction · Opened Dec 18, 2024
`as enum` assertion for object literals Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#60790 · 8 comments · 82 reactions · Opened Dec 17, 2024
Organize Import removes React import on React JS files Open

Needs More Info

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

microsoft/TypeScript#60775 · 6 comments · 1 reaction · Opened Dec 16, 2024
Support a built-in type for well-formed strings Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#60765 · 1 comment · Opened Dec 15, 2024
[tsserver] add support to fetch symbol references from only the current file. Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#60763 · 1 comment · Opened Dec 14, 2024
Add a "Export unused declaration" codefix Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#60762 · Opened Dec 14, 2024
instantiation expression usage leading to an invalid d.ts file generation Open

Bug Domain: Declaration Emit

microsoft/TypeScript#60758 · 4 comments · 1 assignee · Opened Dec 13, 2024
Typescript gets confused when renaming by only changing filename case of imported file on Windows Open

Bug Domain: Module Resolution Needs Human Review Needs More Info

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

microsoft/TypeScript#60756 · 1 comment · Opened Dec 13, 2024
Adding documentation comments to the return values of destructuring syntax Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#60759 · 1 comment · 2 reactions · Opened Dec 13, 2024
Include constant type properties in navtree Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#60760 · 4 comments · Opened Dec 13, 2024
Scoped module declarations Open

Needs Proposal Suggestion

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

microsoft/TypeScript#60751 · 4 comments · 13 reactions · Opened Dec 12, 2024
[Bug Fix]: Bring parity to JS declaration generation for classes with static private members to match TS declaration output. Open

Needs Investigation

microsoft/TypeScript#60744 · 2 comments · 1 reaction · 1 assignee · Opened Dec 12, 2024

microsoft/TypeScript

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