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

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4,855 open issues indexed

[isolatedDeclarations] Should imported JSON files be emitted when "resolveJsonModules", "emitDeclarationOnly", and "isolatedDeclarations" are all enabled? Open

Needs Investigation

microsoft/TypeScript#58684 · 2 comments · 1 reaction · 1 assignee · Opened May 28, 2024
Type a standard import with jsdoc only Open

Awaiting More Feedback Domain: JavaScript Domain: JSDoc Suggestion

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

microsoft/TypeScript#58675 · 3 comments · Opened May 28, 2024
CommonJS globals permitted for ES module builds with no compiler error. Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#58658 · 9 comments · 1 reaction · Opened May 25, 2024
Improve support for internal packages by resolving path aliases Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#58657 · 4 comments · 15 reactions · Opened May 25, 2024
[API] Ability to check if a parameter is being passed to const type parameter Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#58656 · 2 reactions · Opened May 25, 2024
JSDoc `@private` on constructor without parameters is omitted in declaration files Open

Bug Domain: Declaration Emit

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

microsoft/TypeScript#58653 · 3 reactions · Opened May 24, 2024
TypeScript does not recognize unreachable code after a method returning never is called outside of its defining scope Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#59138 · 4 comments · 7 reactions · Opened May 24, 2024
TS 5.4.5: Return type for performance.getEntriesByType is inaccurate Open

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

microsoft/TypeScript#58644 · 5 comments · 11 reactions · 2 assignees · Opened May 24, 2024
"Organize Imports" should adjust specifiers based on preferences Open

Domain: LS: Organize Imports In Discussion Suggestion

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

microsoft/TypeScript#58642 · 3 comments · 1 reaction · Opened May 24, 2024
Nullish coalescing operator but for conditional types Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#58629 · 2 comments · 1 reaction · Opened May 23, 2024
Compiler cannot handle promise.then(null | undefined) Open

Needs Investigation

microsoft/TypeScript#58619 · 8 comments · 1 assignee · Opened May 22, 2024
Syntax highlighting can not resolve @throws of tsdoc Open

Bug Domain: JSDoc Help Wanted

Difficulty 4/5 3-5 days Newbie friendliness 28/100

microsoft/TypeScript#58599 · 3 comments · 5 reactions · Opened May 21, 2024
Incorrect type handing/reduction Open

Needs More Info

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

microsoft/TypeScript#58591 · 3 comments · Opened May 20, 2024
Bloomberg TS5.5-beta feedback [part two] Open

Discussion

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

microsoft/TypeScript#58587 · 1 comment · 9 reactions · Opened May 20, 2024
FEATURE REQUEST: For TypeScript / JS add new refactor feature: if class method can be static add tooltip "make method static" Open

Awaiting More Feedback Domain: LS: Refactorings Suggestion

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

microsoft/TypeScript#58588 · 3 comments · 2 reactions · Opened May 20, 2024
Reachability analysis of `never` for `yield*` is unchecked Open

Needs Investigation

microsoft/TypeScript#58582 · 2 comments · 1 reaction · 1 assignee · Opened May 20, 2024
Function parameters are not inferable when defined via JSDoc using @type tag (with strict) Open

Domain: JSDoc Help Wanted Possible Improvement

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

microsoft/TypeScript#58580 · 5 comments · Opened May 19, 2024
Allow leading underscore for types to bypass noUnusedLocals warning Open

Help Wanted Suggestion

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

microsoft/TypeScript#58561 · 6 comments · 16 reactions · Opened May 17, 2024
Use of intersection type leads to extremely slow typecheck times Open

Needs More Info

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

microsoft/TypeScript#58559 · 9 comments · Opened May 17, 2024
Bad error when using `import()` type within JSDoc tag `@implements` Open

Bug Domain: JSDoc

microsoft/TypeScript#58542 · 2 comments · 2 reactions · 1 assignee · Opened May 15, 2024
duplicate comments on decorated fields Open

Bug Domain: Comment Emit Help Wanted

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

microsoft/TypeScript#58540 · Opened May 14, 2024
Isolated declarations uses type information when emitting computed object keys Open

Domain: Declaration Emit Domain: flag: isolatedDeclarations Possible Improvement

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

microsoft/TypeScript#58533 · 6 comments · Opened May 14, 2024
Isolated declarations does not handle object getters and setters with different types Open

Domain: Declaration Emit Domain: flag: isolatedDeclarations Experience Enhancement

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

microsoft/TypeScript#58531 · 6 comments · Opened May 14, 2024
Bloomberg TS5.5-beta feedback Open

Discussion

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

microsoft/TypeScript#58523 · 1 comment · 1 reaction · Opened May 13, 2024
Narrowing by type predicate fails to produce intersection type with weak type Open

Bug Domain: check: Control Flow Help Wanted

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

microsoft/TypeScript#58518 · Opened May 13, 2024
Find All References should include composed return value Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#58509 · 2 reactions · Opened May 12, 2024
Discriminated union with an optional discriminator is not being resolved as expected Open

Domain: check: Type Inference Experimentation Needed Help Wanted Possible Improvement

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

microsoft/TypeScript#58508 · 4 comments · 1 reaction · Opened May 12, 2024
Handle JSDoc {@link ... } inline tags for OS Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#58491 · 1 comment · Opened May 10, 2024
Type printing does not detect that a name is shadowed in the current scope Open

Bug Domain: Declaration Emit Help Wanted

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

microsoft/TypeScript#58456 · Opened May 7, 2024
Add a rule to the compiler options to disallow the `assert` keyword for import attributes Open

Committed Suggestion

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

microsoft/TypeScript#58453 · 10 comments · 4 reactions · Opened May 7, 2024
Check for missing property on union type causes failure in subsequent property checks Open

Domain: check: Control Flow Help Wanted Possible Improvement

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

microsoft/TypeScript#58448 · 17 comments · Opened May 6, 2024
Module resolution: Should error because of bad import, but TSC builds successfully. TSServer shows error in editor correctly. Open

Bug Domain: Module Resolution

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

microsoft/TypeScript#58446 · 1 comment · Opened May 6, 2024
Error in Index Signature Assignment Open

Bug Domain: check: Excess Property Checking Help Wanted

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

microsoft/TypeScript#58442 · 3 comments · 2 reactions · Opened May 5, 2024
typescript-language-features remote ssh crash Open

Needs More Info

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

microsoft/TypeScript#59139 · 3 comments · Opened May 4, 2024
Compiler Option to monitor external dependencies Open

Awaiting More Feedback Suggestion

Difficulty 5/5 Over a week Newbie friendliness 45/100

microsoft/TypeScript#58433 · 2 comments · 4 reactions · Opened May 4, 2024
JS object destructuring: allow to shorten expression when assignment is renamed back to original property value Open

Experience Enhancement Suggestion

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

microsoft/TypeScript#58447 · 2 comments · 6 reactions · Opened May 3, 2024
Issues with `isolatedDeclarations` and the associated fixes in editor Open

Domain: flag: isolatedDeclarations

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

microsoft/TypeScript#58426 · 5 comments · Opened May 3, 2024
type inference issue with dynamic template literals Open

Domain: check: Type Inference Help Wanted Possible Improvement

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

microsoft/TypeScript#58402 · 2 comments · 1 reaction · Opened May 2, 2024
TS Server fatal error: Maximum call stack size exceeded Open

Bug Domain: Crashes Needs Human Review Needs More Info

microsoft/TypeScript#59047 · 4 comments · 1 assignee · Opened May 1, 2024
Defer TransformFlags Calculation Open

Domain: Performance Experimentation Needed Suggestion

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

microsoft/TypeScript#58395 · 2 comments · 1 reaction · Opened May 1, 2024
[isolatedDeclarations][5.5] Type annotations needed for literals containing enum values Open

Awaiting More Feedback Domain: API: ts.transpileDeclaration Domain: flag: isolatedDeclarations Suggestion

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

microsoft/TypeScript#58394 · 6 comments · Opened May 1, 2024
Icons are completely messed up in Visual Studio member list Open

Needs Investigation

microsoft/TypeScript#58384 · 4 comments · 1 assignee · Opened May 1, 2024
[ID] `--isolatedDeclarations` disallows `const` initialized with a regex literal Open

Bug Domain: flag: isolatedDeclarations Help Wanted

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

microsoft/TypeScript#58383 · 5 comments · Opened May 1, 2024
TS hangs up entire computer, type of variables stuck at "Loading..." Open

Bug Domain: Performance

microsoft/TypeScript#58373 · 21 comments · 1 reaction · 1 assignee · Opened Apr 30, 2024
Removing `node_modules`, running `npm ci` leaves diagnostics behind in ts and tsconfig files Open

Needs Investigation

microsoft/TypeScript#58359 · 1 assignee · Opened Apr 29, 2024
When relatively importing a `.d.ts` file in a declaration file, TypeScript loads a `.ts` file instead Open

Needs Investigation

microsoft/TypeScript#58353 · 8 comments · 1 assignee · Opened Apr 29, 2024
Strange runtime caching bug involving `as const` and `const T` generic Open

Domain: check: Error Instability Help Wanted Possible Improvement

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

microsoft/TypeScript#58351 · 1 comment · Opened Apr 29, 2024
Error when accessing properties on `globalThis` with the same name of a global variable Open

Bug Domain: Something Else Help Wanted

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

microsoft/TypeScript#58345 · 5 comments · 1 reaction · Opened Apr 28, 2024
Elementwise elaboration fails to be found for properties mixed with incompatible index signatures using intersections Open

Domain: Intersection Help Wanted Possible Improvement

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

microsoft/TypeScript#58344 · Opened Apr 28, 2024
generator next type should be inferred as union (instead of intersection) of yields' types OR just unknown Open

Needs Investigation

microsoft/TypeScript#58343 · 5 reactions · 1 assignee · Opened Apr 27, 2024

microsoft/TypeScript

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