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

Beginner friendly Everything

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4,855 open issues indexed

Allow `.js` file generated from `.tsx` file to be runnable in browser with less configuration Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#59879 · 5 comments · Opened Sep 6, 2024
"const" was transformed to "var" when target is "esnext" Open

Bug Domain: JS Emit Help Wanted

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

microsoft/TypeScript#59877 · 3 comments · Opened Sep 6, 2024
False positive for "Unreachable code detected" for code following `switch`/`case` with `allowUnreachableCode: false` Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#59876 · 3 comments · Opened Sep 6, 2024
Inferred project that currently use "current directory of tsserver host" needs some special handling Open

Needs Investigation

microsoft/TypeScript#59870 · 1 assignee · Opened Sep 5, 2024
Constraints of nested conditional types applied to constrained type variables are incorrect Open

Bug Domain: Conditional Types Help Wanted

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

microsoft/TypeScript#59868 · Opened Sep 5, 2024
Allow --build with Intermediate Errors - shouldn't happen on tsconfig errors Open

Awaiting More Feedback Domain: tsc -b Suggestion

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

microsoft/TypeScript#59867 · 4 comments · Opened Sep 5, 2024
Clarify logging for "No Project" when hitting memory limit Open

Needs Investigation

microsoft/TypeScript#59856 · 1 comment · 1 assignee · Opened Sep 4, 2024
Add support for nixos for easily on-boarding developers onto the project. Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#59855 · 1 comment · Opened Sep 4, 2024
Some of the semantic diagnostics use fileName and not relative file name as part of semantic diagnostics and it makes tsbuildinfo unportable Open

microsoft/TypeScript#59851 · 1 comment · 1 assignee · Opened Sep 4, 2024
Error type on spreading array with additional props Open

Bug Domain: Intersection Help Wanted

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

microsoft/TypeScript#59849 · 1 comment · Opened Sep 4, 2024
NoInfer doesn't work in string template types Open

Bug Domain: check: Type Inference

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

microsoft/TypeScript#59826 · 2 comments · Opened Sep 2, 2024
Confusing/inconsistent error messages when erroring on disallowed merge Open

Domain: Error Messages Possible Improvement

microsoft/TypeScript#59808 · 9 comments · 1 reaction · 1 assignee · Opened Aug 30, 2024
Type PermissionName for Permission API doesn't contain microphone and camera devices Open

Needs Investigation

microsoft/TypeScript#59805 · 2 comments · 1 reaction · 1 assignee · Opened Aug 30, 2024
TS2454 Variable is used before being assigned with strictNullChecks when variable is clearly assigned but can be undefined Open

Bug Domain: check: Control Flow

microsoft/TypeScript#59804 · 1 comment · 7 reactions · 1 assignee · Opened Aug 29, 2024
Adjust relative imports in TypeScript when using copy-paste Open

Experience Enhancement Suggestion

microsoft/TypeScript#59841 · 4 comments · 1 assignee · Opened Aug 29, 2024
`@deprecated` nested namespace handling is buggy Open

Domain: JSDoc Help Wanted Possible Improvement

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

microsoft/TypeScript#59792 · 2 comments · 3 reactions · Opened Aug 29, 2024
Multi-line top-level `await` causes duplicate declaration error Open

Bug Domain: Binder Help Wanted

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

microsoft/TypeScript#59777 · 3 comments · Opened Aug 27, 2024
autoImportFileExcludePatterns should have more nuance than just true/false Open

Awaiting More Feedback Domain: LS: Auto-import Suggestion

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

microsoft/TypeScript#59776 · 6 reactions · Opened Aug 27, 2024
Bloomberg TS 5.6 Beta Feedback Open

Discussion

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

microsoft/TypeScript#59775 · 5 reactions · Opened Aug 27, 2024
Wildcard/star export from type expression Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#59758 · Opened Aug 26, 2024
Inconsistent boolean literal types in objects Open

Bug Domain: check: Type Inference Help Wanted

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

microsoft/TypeScript#59754 · Opened Aug 26, 2024
Boolean narrowed to true only when generic type is explicitly provided while it shouldn't Open

Needs More Info

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

microsoft/TypeScript#59738 · 9 comments · 1 reaction · Opened Aug 24, 2024
`instantiateMappedTupleType` should not use array index as mapping key, at least it's not in an appropriate way Open

Needs Investigation

microsoft/TypeScript#59737 · 1 assignee · Opened Aug 24, 2024
Google feedback on TS 5.6-beta Open

Discussion

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

microsoft/TypeScript#59733 · 5 comments · 3 reactions · Opened Aug 23, 2024
Inlay variance hints Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#59730 · 4 reactions · Opened Aug 23, 2024
Optimal TS monorepos: how to handle project references when projects opt out of composite within dependency chain Open

Needs Investigation

microsoft/TypeScript#59727 · 4 comments · 1 assignee · Opened Aug 23, 2024
Readonly shorthand cast for expression where `as const` is forbidden Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#59726 · Opened Aug 23, 2024
Generic type narrowing for truthy check has inconsistent / incorrect behavior Open

Needs Investigation

microsoft/TypeScript#59717 · 6 comments · 1 reaction · 1 assignee · Opened Aug 22, 2024
Interface type coercion fails with unsatisfied properties in unions Open

Bug Domain: check: Type Inference Help Wanted

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

microsoft/TypeScript#59716 · 1 comment · 1 reaction · Opened Aug 22, 2024
Type is not referred correctly in the while loop Open

Bug Domain: check: Control Flow Help Wanted

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

microsoft/TypeScript#59715 · 11 comments · Opened Aug 22, 2024
wrong behavior about type parameters of `as` clause in a mapped type Open

Domain: Mapped Types Help Wanted Possible Improvement

Difficulty 4/5 3-5 days Newbie friendliness 32/100

microsoft/TypeScript#59713 · 2 comments · Opened Aug 22, 2024
Unions of assertion functions do not act as assertion functions Open

Bug Domain: This-Typing Help Wanted

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

microsoft/TypeScript#59707 · 3 comments · Opened Aug 21, 2024
Conditional (using extends) parametrised type inference seems to be inconsistent Open

Needs Investigation

microsoft/TypeScript#59700 · 2 comments · 1 assignee · Opened Aug 20, 2024
Regex unicode property autocomplete Open

Awaiting More Feedback Domain: LS: Completion Lists Suggestion

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

microsoft/TypeScript#59697 · 1 reaction · Opened Aug 20, 2024
[tsserver] Make "configure excludes" warning more debuggable Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#59681 · 2 comments · 12 reactions · Opened Aug 19, 2024
Add `--strictObjectIterables` (bikeshed): exclude primitive (`string`) from `Iterable` types Open

Needs Proposal Suggestion

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

microsoft/TypeScript#59676 · 4 comments · 1 reaction · Opened Aug 18, 2024
Signatures with less parameters aren't assignable to compatible targets with more when their rest param is an instantiated `NoInfer` Open

Domain: check: Type Inference Help Wanted Possible Improvement

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

microsoft/TypeScript#59668 · 2 comments · 1 reaction · Opened Aug 17, 2024
Type Instantiation is Excessively Deep Regression In #56004 Open

Needs Investigation

microsoft/TypeScript#59667 · 1 comment · 16 reactions · 1 assignee · Opened Aug 17, 2024
Make type narrowing for destructured discriminated unions work for more types Open

Domain: check: Control Flow Help Wanted Possible Improvement

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

microsoft/TypeScript#59657 · 1 comment · Opened Aug 16, 2024
5.6 regression: Incorrect param type inference for type with all optional props Open

Bug Domain: check: Type Inference Help Wanted

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

microsoft/TypeScript#59656 · 9 comments · Opened Aug 16, 2024
Allow type annotations in .js files in preparation for Type Annotations proposal Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#59648 · Opened Aug 15, 2024
TypeScript can't infer type of default parameters Open

Domain: check: Type Inference Help Wanted Possible Improvement

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

microsoft/TypeScript#59643 · 2 comments · Opened Aug 15, 2024
`importModuleSpecifierPreference: "non-relative"` should use self-name package imports Open

Awaiting More Feedback Suggestion

microsoft/TypeScript#59620 · 3 comments · 1 reaction · 1 assignee · Opened Aug 13, 2024
[5.5 regression] "Maximum call stack size exceeded" when serializing nested self-referencing class expressions Open

Bug Domain: Declaration Emit Help Wanted

Difficulty 4/5 3-5 days Newbie friendliness 32/100

microsoft/TypeScript#59600 · Opened Aug 12, 2024
The JS/TS language service crashed. Open

Needs More Info

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

microsoft/TypeScript#59602 · 4 comments · Opened Aug 11, 2024
TypeScript language server fails to recognize new files and needs restart Open

Needs More Info

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

microsoft/TypeScript#60040 · 5 comments · 5 reactions · Opened Aug 10, 2024
Add organize imports presets Open

Committed Suggestion

microsoft/TypeScript#59579 · 1 assignee · Opened Aug 9, 2024
`satisfies` for return types Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#59577 · 5 comments · 18 reactions · Opened Aug 9, 2024
compilerOptions.plugins accepts missing plugins without any logging or error information Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#59575 · 2 comments · 2 reactions · Opened Aug 9, 2024
Type name in @throws not rendered as a link Open

Domain: JSDoc Help Wanted Possible Improvement

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

microsoft/TypeScript#59578 · 2 comments · Opened Aug 9, 2024

microsoft/TypeScript

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