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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4,855 open issues indexed

Reverse mapped type inference fails to infer from annotated parameters in partially-inferrable object types Open

Domain: Mapped Types Help Wanted Possible Improvement

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

microsoft/TypeScript#57788 · 1 comment · Opened Mar 15, 2024
Declaration emit inlines types incorrectly Open

Domain: Declaration Emit Help Wanted Possible Improvement

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

microsoft/TypeScript#57779 · 2 comments · 7 reactions · Opened Mar 14, 2024
Contextual inference for nested calls that return constructors Open

Domain: check: Type Inference Help Wanted Possible Improvement

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

microsoft/TypeScript#57747 · 2 comments · Opened Mar 12, 2024
Declare method quick fix should ask for method visibility and return type Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#57737 · Opened Mar 12, 2024
Allow type narrowing to be specified as always-on or always-off Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#57725 · 15 comments · 364 reactions · Opened Mar 11, 2024
JavaScript class property becomes `any` without warning when used in a function that is assigned to itself Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#57711 · 5 comments · Opened Mar 9, 2024
Regression performance compiling types in version 5.4.2 Open

Needs More Info

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

microsoft/TypeScript#57710 · 20 comments · 2 reactions · Opened Mar 9, 2024
Unexpected type infer for function first argument with default value since 5.1 Open

Domain: check: Type Inference Help Wanted Possible Improvement

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

microsoft/TypeScript#57706 · 2 comments · Opened Mar 9, 2024
TS: duplicated imports in this case Open

Needs Investigation Rescheduled

microsoft/TypeScript#57726 · 2 comments · 1 assignee · Opened Mar 8, 2024
Un-feature suggestion: relax type predicate construction rule Open

In Discussion Suggestion

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

microsoft/TypeScript#57685 · 1 reaction · Opened Mar 7, 2024
[ID-Prep] Preserve type nodes from function expressions in initialisers Open

Committed Suggestion

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

microsoft/TypeScript#57677 · Opened Mar 7, 2024
Support conditional types for Generator T / TNext / TReturn Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#57671 · 3 comments · Opened Mar 7, 2024
`satisfies` operator could not completely overshadow the existing contextual type Open

Needs Proposal Suggestion

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

microsoft/TypeScript#57667 · 6 comments · 1 reaction · Opened Mar 6, 2024
Parameters typed as `unknown` even when the function type has the correct types Open

Needs More Info

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

microsoft/TypeScript#57654 · 6 comments · Opened Mar 5, 2024
Error message displays computed name '[attr]' instead of key value Open

Experience Enhancement Help Wanted Suggestion

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

microsoft/TypeScript#57653 · 3 comments · Opened Mar 5, 2024
Generic conditional type prematurely resolves to one of the branches instead of deferring Open

Needs Investigation

microsoft/TypeScript#57650 · 6 comments · 1 assignee · Opened Mar 5, 2024
JS | Optional chaining left hand assignment not detected as syntax error. Open

Bug Domain: Parser Help Wanted

Difficulty 3/5 1-2 days Newbie friendliness 48/100

microsoft/TypeScript#57640 · 9 comments · Opened Mar 4, 2024
Function expressions widen to `{}` in auto arrays Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#57627 · 2 comments · 1 reaction · Opened Mar 4, 2024
Incorrect generic type inference of generator function Open

Needs Investigation

microsoft/TypeScript#57625 · 1 comment · 2 reactions · 1 assignee · Opened Mar 4, 2024
Class marked as unused when used in a static block Open

Bug Domain: LS: Suggestion Diagnostics Help Wanted

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

microsoft/TypeScript#57620 · 16 comments · Opened Mar 3, 2024
Private class field helpers throw a confusing error when in unbound method with undefined `this` Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#57609 · 2 comments · Opened Mar 2, 2024
Add `async`ness to semantic highlighting Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#57593 · 1 comment · Opened Mar 1, 2024
Show deprecated strikethrough for JSX properties when union type Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#57584 · 3 comments · 13 reactions · Opened Feb 29, 2024
Inconsistent error between different versions of the same function with required parameter following an optional one Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#57565 · 3 comments · Opened Feb 27, 2024
Error not issued when global type is an alias of an object type literal Open

Bug Domain: Something Else Has Repro Needs Human Review Needs More Info

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

microsoft/TypeScript#57564 · 7 comments · Opened Feb 27, 2024
Declaration merging in plain JS with JSDoc Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#57559 · 9 comments · Opened Feb 27, 2024
Incorrect resolution of CJS types from dual-package dependency in multi-project build with mixed `ESNext/Bundler` and `NodeNext` modules Open

Bug Domain: Node ESM

microsoft/TypeScript#57553 · 6 comments · 1 reaction · 1 assignee · Opened Feb 26, 2024
Wrong elementwise error location on optional object property that allows arrays too Open

Domain: Related Error Spans Help Wanted Possible Improvement

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

microsoft/TypeScript#57541 · Opened Feb 26, 2024
unintended escaped string for hover Open

Bug Domain: Error Messages Help Wanted

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

microsoft/TypeScript#57539 · 4 comments · Opened Feb 26, 2024
Expose design-time type information in TC39 decorator metadata when `emitDecoratorMetadata: true` Open

Needs Proposal Suggestion

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

microsoft/TypeScript#57533 · 29 comments · 71 reactions · Opened Feb 25, 2024
Suggest interpolated `number`, `string` and `bigint` types in TypeScript template literals Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#57545 · 1 comment · 3 reactions · Opened Feb 25, 2024
TS does not support resolving paths with colons Open

Bug Domain: Module Resolution Help Wanted

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

microsoft/TypeScript#57529 · 8 comments · Opened Feb 25, 2024
lib.dom.d.ts seems to not be referenced when any file in the compilation contains no-default-lib=true triple slash Open

Needs Investigation

microsoft/TypeScript#57524 · 6 comments · 1 assignee · Opened Feb 24, 2024
tsc with allowJs reports TS9005 error for nested anonymous constructor functions Open

Domain: Declaration Emit Help Wanted Possible Improvement

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

microsoft/TypeScript#57523 · 6 comments · Opened Feb 24, 2024
incorrect inference in union of tuple types Open

Domain: check: Type Inference Help Wanted Possible Improvement

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

microsoft/TypeScript#57522 · 2 comments · Opened Feb 24, 2024
Change type of `File` constructor parameter `fileBits` to `Iterable<BlobPart>` Open

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

microsoft/TypeScript#57520 · 1 comment · 2 reactions · 2 assignees · Opened Feb 24, 2024
Intl.NumberFormat does not model required properties when `style` is set to `currency` Open

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

microsoft/TypeScript#57514 · 2 comments · 4 reactions · 2 assignees · Opened Feb 23, 2024
Allow instantion expression with empty arguments Open

In Discussion Suggestion

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

microsoft/TypeScript#57510 · 2 comments · 1 reaction · Opened Feb 23, 2024
@ts-expect-error not ignoring next line correctly in JSX, and errors are reported on the same line Open

Bug Domain: JSX/TSX Help Wanted

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

microsoft/TypeScript#57488 · 1 comment · Opened Feb 22, 2024
Proposal for merging array or object options in tsconfig file Open

In Discussion Suggestion

microsoft/TypeScript#57486 · 33 comments · 127 reactions · 1 assignee · Opened Feb 22, 2024
Expose tracing module to public API Open

Domain: API In Discussion Suggestion

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

microsoft/TypeScript#57477 · 3 comments · 2 reactions · Opened Feb 22, 2024
Control flow analysis gets confused by decorators Open

Needs Investigation

microsoft/TypeScript#57462 · 2 comments · 1 assignee · Opened Feb 21, 2024
Wrong `super` in class element decorator Open

Needs Investigation

microsoft/TypeScript#57461 · 1 comment · 1 assignee · Opened Feb 21, 2024
[ID-Prep] Explicit type annotation of const replaced with initializer in declaration emit Open

Domain: flag: isolatedDeclarations Help Wanted Possible Improvement

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

microsoft/TypeScript#57442 · Opened Feb 19, 2024
[ID-Prep] Type of variable is widened in declaration with !strictNullChecks Open

Domain: flag: isolatedDeclarations Help Wanted Possible Improvement

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

microsoft/TypeScript#57441 · 1 comment · Opened Feb 19, 2024
Annotations/IntelliSense gets lost with simple `&` and `|` joins or utilities Open

Experience Enhancement Help Wanted Suggestion

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

microsoft/TypeScript#57418 · 2 comments · Opened Feb 15, 2024
[TS 5.4.0-beta] .d.ts emit adding an inline type import instead of utilising existing import Open

Domain: Declaration Emit Help Wanted Possible Improvement

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

microsoft/TypeScript#57415 · 8 comments · 1 reaction · Opened Feb 15, 2024
Private constructor type simplification produces incompatible type Open

Bug Domain: Declaration Emit Help Wanted

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

microsoft/TypeScript#57412 · 4 comments · Opened Feb 15, 2024
Support labels in template string Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#57385 · 4 comments · 2 reactions · Opened Feb 12, 2024
Change return type of `Object` call signature to `unknown` (currently `any`) Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#57379 · 4 comments · Opened Feb 11, 2024

microsoft/TypeScript

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