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

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4,857 open issues indexed

Hover documentation for typescript uses jsdoc rules and not tsdoc Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#61603 · 8 comments · 5 reactions · Opened Apr 19, 2025
Support auto-completion for TSDoc Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#61592 · Opened Apr 18, 2025
TS4055 when generating declaration for return type that uses type of paramter for protected methods Open

Bug Domain: Declaration Emit Help Wanted

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

microsoft/TypeScript#61591 · 3 comments · Opened Apr 18, 2025
Internal error in tsc: "TypeError: Cannot read properties of undefined (reading 'flags')" Open

Bug Domain: Crashes

microsoft/TypeScript#61583 · 3 comments · 1 reaction · 1 assignee · Opened Apr 16, 2025
Allow return type annotations on setters Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#61561 · 5 comments · Opened Apr 10, 2025
Always Show Return Type Open

Needs Investigation

microsoft/TypeScript#61550 · 2 comments · 1 reaction · 1 assignee · Opened Apr 6, 2025
Infer tuple types like template literal types do Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#61539 · 1 reaction · Opened Apr 6, 2025
Filename with two dollar signs ($$) behaves differently when using paths config Open

Needs Investigation

microsoft/TypeScript#61538 · 2 reactions · 1 assignee · Opened Apr 5, 2025
Error: Debug Failure. No error for last overload signature Open

Bug Domain: check: Variance Relationships Help Wanted

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

microsoft/TypeScript#61524 · 6 comments · 1 reaction · Opened Apr 3, 2025
`Parameters` returns `never` when used with a generic function that combines `Pick` and `Partial` on the generic type argument Open

Bug Domain: check: Type Inference Help Wanted

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

microsoft/TypeScript#61516 · 2 comments · Opened Apr 1, 2025
Confusing error on computed name class member Open

Domain: Error Messages Help Wanted Possible Improvement

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

microsoft/TypeScript#61510 · 2 comments · Opened Mar 31, 2025
Unsafe Map overload spoils direct property access on parenthesized assignment expression Open

Domain: check: Type Inference Help Wanted Possible Improvement

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

microsoft/TypeScript#61506 · 2 comments · 2 reactions · Opened Mar 30, 2025
Covariant generic parameters fail unification Open

Bug Domain: check: Type Inference Help Wanted

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

microsoft/TypeScript#61503 · Opened Mar 28, 2025
[isolatedDeclarations] Optional parameter properties are unnecessarily disallowed in isolatedDeclarations mode Open

Needs Investigation

microsoft/TypeScript#61501 · 1 comment · 2 reactions · 1 assignee · Opened Mar 28, 2025
Broken Autocomplete and Type Display For Parameters Dependent on Transitively Contextually Typed Return Type Open

Bug Domain: check: Contextual Types Help Wanted

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

microsoft/TypeScript#61500 · 1 comment · Opened Mar 28, 2025
Never-initialized variable type is not narrowed to undefined Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#61496 · 4 comments · Opened Mar 27, 2025
Trailing comma in dynamic import should be allowed also when used in a `typeof` type Open

Domain: ES Modules Help Wanted Possible Improvement

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

microsoft/TypeScript#61489 · 1 comment · 2 reactions · Opened Mar 26, 2025
"Find All References" shows all interface implementations instead of specific class method references Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#61484 · 1 comment · 2 reactions · Opened Mar 25, 2025
Wrong import attribute typed as any, but should be typed as string Open

Domain: ES Modules Help Wanted Possible Improvement

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

microsoft/TypeScript#61469 · 5 comments · Opened Mar 23, 2025
Explicit target type breaks generic parameter inference for function call with intersection return type Open

Domain: check: Type Inference Help Wanted Possible Improvement

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

microsoft/TypeScript#61467 · 1 comment · Opened Mar 23, 2025
`InstanceType` and constructor return type inference doesn’t work for built‑in subtypes of `ErrorConstructor` Open

Domain: lib.d.ts Help Wanted Possible Improvement

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

microsoft/TypeScript#61460 · 4 comments · 1 reaction · Opened Mar 21, 2025
Add types for `String.{matchAll,replaceAll}` with a well known symbol Open

Domain: lib.d.ts Help Wanted Possible Improvement

microsoft/TypeScript#61448 · 3 comments · 1 assignee · Opened Mar 19, 2025
Type alias circularly references itself Open

Domain: check: Type Circularity Help Wanted Possible Improvement

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

microsoft/TypeScript#61443 · 6 comments · 2 reactions · Opened Mar 18, 2025
Use Profile-Guided Optimization (PGO) for the compiler itself Open

Domain: Performance Possible Improvement

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

microsoft/TypeScript#63774 · 5 comments · 1 reaction · Opened Mar 18, 2025
Using pointer address as node/symbol id Open

Domain: Performance

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

microsoft/TypeScript#63773 · 5 comments · Opened Mar 17, 2025
Type Conversion Error with Empty and Non-Empty Generic Types in Record Mapping Open

Bug Domain: check: Type Inference Help Wanted

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

microsoft/TypeScript#61436 · 2 comments · Opened Mar 16, 2025
`{@link Class.name}` resolves wrongly to `Function.name` Open

Needs Investigation

microsoft/TypeScript#61433 · 4 comments · 1 reaction · 1 assignee · Opened Mar 16, 2025
Arithmetic operations on type-parameters subtyping `bigint` are incorrectly inferred to have type `number` Open

Bug Domain: check: Type Inference Help Wanted

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

microsoft/TypeScript#61429 · Opened Mar 15, 2025
Intellisense: deprioritise native function methods Open

Experience Enhancement Help Wanted Suggestion

microsoft/TypeScript#61426 · 2 comments · 2 reactions · 1 assignee · Opened Mar 15, 2025
Potentially-`undefined` value not flagged when destructuring union of empty tuple and array Open

Bug Domain: check: Control Flow Help Wanted

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

microsoft/TypeScript#61424 · 4 comments · 1 reaction · Opened Mar 14, 2025
Allow tuple labels passed to `satisfies` to participate in type inference Open

Experience Enhancement Help Wanted Suggestion

Difficulty 5/5 Over a week Newbie friendliness 38/100

microsoft/TypeScript#61415 · 4 reactions · Opened Mar 13, 2025
Missing compiler error (or emit bug) in another isolatedModules + emitDecoratorMetadata use case Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#61411 · 2 comments · Opened Mar 13, 2025
A flag to replace removed syntax with blank space Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#61410 · 15 reactions · Opened Mar 12, 2025
Transformer Plugin or Compiler API Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#63771 · 14 comments · 47 reactions · Opened Mar 12, 2025
`transformTime` performance regression since 5.6.x Open

Needs Investigation

microsoft/TypeScript#61406 · 11 comments · 27 reactions · 1 assignee · Opened Mar 12, 2025
Yarn PnP Open

Suggestion

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

microsoft/TypeScript#63769 · 4 comments · 142 reactions · Opened Mar 11, 2025
require() is generated in JS although there's no runtime code Open

Needs Investigation

microsoft/TypeScript#61395 · 5 comments · 1 assignee · Opened Mar 11, 2025
TS Perf degradation since last version upgrade Open

Needs More Info

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

microsoft/TypeScript#61400 · 20 comments · 1 reaction · Opened Mar 10, 2025
'in' does not remove undefined from indexed value (with noUncheckedIndexedAccess) Open

Domain: check: Control Flow Help Wanted Possible Improvement

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

microsoft/TypeScript#61389 · 3 comments · Opened Mar 10, 2025
Add initializer property to JSDocParameterTag node Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#61373 · 2 comments · 1 reaction · Opened Mar 7, 2025
Add allowImportingJsExtensions option to prevent incorrect .js imports Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#61371 · 1 comment · 8 reactions · Opened Mar 7, 2025
typeToString doesn't respect TypeFormatFlags.MultilineObjectLiterals Open

Needs Investigation

microsoft/TypeScript#61348 · 1 reaction · 1 assignee · Opened Mar 4, 2025
Intersection for same key read-only property maybe wrong Open

Bug Domain: Intersection Help Wanted

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

microsoft/TypeScript#61344 · Opened Mar 4, 2025
JSX types should automatically pick setter types instead of getter types. Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#61341 · 1 comment · Opened Mar 3, 2025
Assigning window.location after 5.8.2 upgrade fails Open

Needs Investigation

microsoft/TypeScript#61335 · 16 comments · 38 reactions · 1 assignee · Opened Mar 3, 2025
Support `proposal-json-parse-with-source` (`JSON.rawJSON()`, `JSON.isRawJSON()`, `context` parameter of `reviver` function, etc...) Open

Bug Domain: lib.d.ts Help Wanted

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

microsoft/TypeScript#61330 · 3 comments · 12 reactions · Opened Mar 2, 2025
`export import` of types is not allowed in namespaces when using `erasableSyntaxOnly` Open

Awaiting More Feedback Has Repro Suggestion

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

microsoft/TypeScript#61326 · 6 comments · Opened Mar 1, 2025
Support for Import Maps Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#61325 · 1 comment · 2 reactions · Opened Mar 1, 2025
Suggestion: Support readonly interfaces in `getSuggestedLibFor...` Open

Domain: Error Messages Help Wanted Possible Improvement

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

microsoft/TypeScript#61323 · 1 comment · Opened Mar 1, 2025
strange interaction with `resolveJsonModule`, `createRequire`, naming it `require`, and requiring JSON Open

Bug Domain: Node ESM Help Wanted Needs Human Review Needs More Info

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

microsoft/TypeScript#61292 · 3 comments · Opened Feb 26, 2025

microsoft/TypeScript

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