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

Slow compilation with nested optional chaining Open

Needs Investigation

microsoft/TypeScript#61273 · 1 assignee · Opened Feb 26, 2025
Add a flag to error when an uninitialized function is called Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#61267 · Opened Feb 25, 2025
`Element.getElementsByTagName` marked as deprecated Open

Needs More Info

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

microsoft/TypeScript#61264 · 6 comments · 1 reaction · Opened Feb 25, 2025
JSDoc `@` in the code block is broken Open

Domain: JSDoc Help Wanted Possible Improvement

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

microsoft/TypeScript#61640 · Opened Feb 24, 2025
Exhaustive switch case with returns can mark a finally block as unreachable Open

Bug Domain: check: Control Flow Help Wanted

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

microsoft/TypeScript#61259 · 1 reaction · Opened Feb 24, 2025
Mixins created from `obj.constructor` cannot have members Open

Domain: classes Help Wanted Possible Improvement

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

microsoft/TypeScript#61255 · 1 reaction · Opened Feb 23, 2025
Conditional type flow types missing in the template in mapped types with as clause Open

Domain: Mapped Types Help Wanted Possible Improvement

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

microsoft/TypeScript#61246 · Opened Feb 22, 2025
Include results from `--extendedDiagnostics` when using the compiler API Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#61229 · 4 comments · Opened Feb 20, 2025
Bloomberg feedback for 5.8 Open

Discussion

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

microsoft/TypeScript#61226 · 1 comment · 5 reactions · Opened Feb 19, 2025
Unions seem to sidestep `--noUncheckedIndexedAccess` and lose the possibility of undefined Open

Bug Domain: flag: noUncheckedIndexedAccess Help Wanted

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

microsoft/TypeScript#61225 · 3 reactions · Opened Feb 19, 2025
Support source phase imports Open

Committed Help Wanted Suggestion

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

microsoft/TypeScript#61216 · 2 comments · 8 reactions · Opened Feb 18, 2025
Support type inference for Symbol keys on function Open

Domain: check: Type Inference Help Wanted Possible Improvement

Difficulty 5/5 Over a week Newbie friendliness 42/100

microsoft/TypeScript#61214 · Opened Feb 18, 2025
Autocompletion of Template Literal Types with unresolved types. Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#61217 · Opened Feb 17, 2025
Instantiable types from return types of contextual signatures don't provide contextual type information for return expressions Open

Domain: check: Contextual Types Help Wanted Possible Improvement

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

microsoft/TypeScript#61197 · Opened Feb 16, 2025
Inconsistent enum literal types Open

Domain: enum Help Wanted Possible Improvement

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

microsoft/TypeScript#61196 · Opened Feb 16, 2025
`// @ts-mutate` decorator/directive Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#61179 · 13 comments · 2 reactions · Opened Feb 14, 2025
Narrow object property indexed by bracket notation when the key is a known literal type, regardless of where the key comes from Open

Domain: check: Control Flow Help Wanted Possible Improvement

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

microsoft/TypeScript#61176 · 1 comment · 11 reactions · Opened Feb 14, 2025
Object.defineProperty(variable) does not error in `.js` files if `variable` does not exist Open

Bug Domain: JavaScript Help Wanted

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

microsoft/TypeScript#61165 · 9 comments · 2 reactions · Opened Feb 12, 2025
Enables `implements` on abstract classes with protected members (usefull for generic mixins) Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#61161 · 1 comment · Opened Feb 10, 2025
When using a string value as export for reference, the .d.ts file created with dot notation instead of computed property which can break Open

Bug Domain: Declaration Emit

microsoft/TypeScript#61159 · 1 reaction · 1 assignee · Opened Feb 10, 2025
Narrowed `const` variables are widened in block-scoped closures Open

Domain: check: Control Flow Help Wanted Possible Improvement

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

microsoft/TypeScript#61158 · 2 comments · 1 reaction · Opened Feb 10, 2025
Decorator helper `__esDecorate` refers to `Object`, which can be clobbered Open

Needs Investigation

microsoft/TypeScript#61150 · 2 comments · 1 assignee · Opened Feb 8, 2025
JavaScript Intellisense doesn't detect types of properties defined in async constructors Open

Domain: JavaScript Help Wanted Possible Improvement

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

microsoft/TypeScript#61137 · 1 reaction · Opened Feb 7, 2025
TypedArray constructor compile error Open

Needs Investigation

microsoft/TypeScript#61134 · 4 comments · 1 assignee · Opened Feb 6, 2025
Feature Request: Instantiate Generic Functions within Conditional Types Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#61133 · 4 comments · Opened Feb 6, 2025
Google feedback on TS 5.8-beta Open

Discussion

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

microsoft/TypeScript#61116 · 1 comment · 4 reactions · Opened Feb 4, 2025
RangeError - Maximum call stack size exceeded - in tsserver / vscode extension host - when providing type args to fn lambda Open

Bug Domain: check: Type Circularity Needs Human Review Needs More Info

microsoft/TypeScript#61110 · 1 comment · 1 assignee · Opened Feb 4, 2025
Add a compiler option to error on destructuring a string as an array Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#61106 · 3 comments · Opened Feb 3, 2025
Pasting plain text is very slow now Open

Needs Investigation

microsoft/TypeScript#61112 · 4 comments · 4 reactions · 1 assignee · Opened Feb 3, 2025
Paste with imports not working correctly Open

Needs Investigation

microsoft/TypeScript#61138 · 1 assignee · Opened Feb 3, 2025
Performance degrades the more wildcards that are contained in TSConfig include or exclude patterns Open

Domain: Performance Experimentation Needed Possible Improvement

Difficulty 3/5 1-2 days Newbie friendliness 25/100

microsoft/TypeScript#61103 · 2 comments · Opened Feb 3, 2025
Index type distributes over intersections too eagerly Open

Domain: Indexed Access Types Help Wanted Possible Improvement

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

microsoft/TypeScript#61101 · Opened Feb 2, 2025
Add more context to unique symbols that appear in type errors Open

Domain: Error Messages Help Wanted Possible Improvement

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

microsoft/TypeScript#61099 · 6 comments · Opened Feb 2, 2025
Type Inference Enhancement of Handler Args Open

Domain: check: Type Inference Help Wanted Possible Improvement

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

microsoft/TypeScript#61095 · 2 comments · Opened Feb 1, 2025
Branded literal type widened in unexpected way Open

Bug Domain: Intersection Help Wanted

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

microsoft/TypeScript#61093 · Opened Jan 31, 2025
Index type for an intersected `NoInfer` can get sometimes incorrectly deferred Open

Domain: Index Types Help Wanted Possible Improvement

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

microsoft/TypeScript#61091 · Opened Jan 31, 2025
JSDOC generics bug for callbacks when args are present Open

Bug Domain: JSDoc Help Wanted

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

microsoft/TypeScript#61090 · 3 comments · 1 reaction · Opened Jan 31, 2025
Giving an error type to types that have failed to resolve, instead of any Open

Experimentation Needed Suggestion

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

microsoft/TypeScript#61089 · 4 comments · 2 reactions · Opened Jan 31, 2025
[TypeScript] Mapped Types with Template Literal Keys Do Not Preserve Type Declaration References Open

Domain: LS: Signature Help Experience Enhancement Help Wanted Suggestion

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

microsoft/TypeScript#61094 · 1 comment · 1 reaction · Opened Jan 31, 2025
A way to enforce `composite`'s rules without using `incremental` Open

In Discussion Suggestion

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

microsoft/TypeScript#61085 · 1 reaction · Opened Jan 30, 2025
Distributive conditional types can't distribute over `NoInfer` types wrapping a union Open

Domain: Conditional Types Help Wanted Possible Improvement

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

microsoft/TypeScript#61076 · Opened Jan 29, 2025
Omitted arguments are not candidates for possibly-undefined type parameters Open

Domain: check: Type Inference Possible Improvement

microsoft/TypeScript#61069 · 1 assignee · Opened Jan 29, 2025
Missing computed properties in declaration emit Open

In Discussion Suggestion

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

microsoft/TypeScript#61068 · 1 comment · Opened Jan 28, 2025
Alternative to rewriteRelativeImportExtensions & allowImportingTsExtensions Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#61050 · 2 comments · 2 reactions · Opened Jan 26, 2025
Display default values for property types. Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#61045 · 2 reactions · Opened Jan 24, 2025
Type variables in type abstractions are not properly concretized Open

Bug Domain: check: Type Inference

microsoft/TypeScript#61041 · 2 comments · 1 assignee · Opened Jan 24, 2025
Type inference fails to recognize never when it's the result of a template tag function Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#61039 · 4 comments · 1 reaction · Opened Jan 24, 2025
rewriteRelativeImportExtensions: tsc doesn't rewrite extensions in emitted declaration files Open

Experience Enhancement Help Wanted Suggestion

Difficulty 4/5 3-5 days Newbie friendliness 55/100

microsoft/TypeScript#61037 · 9 comments · 3 reactions · Opened Jan 24, 2025
ES2017 Async Generator Suspended on `yield*` Continues Execution When Returned Open

Needs Investigation

microsoft/TypeScript#61022 · 1 assignee · Opened Jan 22, 2025
rewriteRelativeImportExtensions & enforce consistent extensions Open

In Discussion Suggestion

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

microsoft/TypeScript#61021 · 9 comments · 13 reactions · Opened Jan 22, 2025

microsoft/TypeScript

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