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

Beginner friendly Everything

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4,855 open issues indexed

Aliased optional chain calls don't narrow like their inline equivalents Open

Domain: check: Control Flow Help Wanted Possible Improvement

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

microsoft/TypeScript#59145 · 2 reactions · Opened Jul 5, 2024
switch-true case-true narrowing not equivalent to default case. Open

Domain: check: Control Flow Help Wanted Possible Improvement

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

microsoft/TypeScript#59133 · 1 reaction · Opened Jul 3, 2024
Nested Promise not automatically unwrapped Open

Needs Investigation

microsoft/TypeScript#59111 · 5 comments · 3 reactions · 1 assignee · Opened Jul 2, 2024
Please Allow return `void` of `set accessor` Open

In Discussion Suggestion

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

microsoft/TypeScript#59105 · 3 comments · 1 reaction · Opened Jul 2, 2024
Inconsistent key type inference when spreading objects with const assertion into plain objects Open

Domain: check: Type Inference Help Wanted Possible Improvement

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

microsoft/TypeScript#59102 · 3 comments · Opened Jul 2, 2024
useUnknownInCatchVariables would do much better to require ": unknown" rather than magically injecting it Open

Domain: Error Messages Experience Enhancement Needs Proposal

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

microsoft/TypeScript#59100 · 1 comment · 3 reactions · Opened Jul 2, 2024
Extend type predicate inference to work with certain type variables Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#59088 · 3 comments · 1 reaction · Opened Jul 1, 2024
VSCode Find All References Not Working for Imported Functions Open

Needs More Info

microsoft/TypeScript#59134 · 3 comments · 1 assignee · Opened Jun 30, 2024
Deprecating no-default-lib and rethinking of other lib related CompilerOptions Open

In Discussion Suggestion

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

microsoft/TypeScript#59067 · 1 comment · Opened Jun 28, 2024
FR: Add TS config option to disable "<some regex feature> is only available when targeting 'es2018' or later.". Open

In Discussion Suggestion

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

microsoft/TypeScript#59066 · 5 comments · Opened Jun 28, 2024
Investigate Wildcard Matching Performance Open

Domain: Performance Suggestion

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

microsoft/TypeScript#59058 · 2 comments · 2 reactions · Opened Jun 27, 2024
Generic parameter type checking stops too early Open

In Discussion Suggestion

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

microsoft/TypeScript#59049 · 10 comments · Opened Jun 27, 2024
Unpredictable behavior when trying to infer a generic type from a union function parameter Open

Bug Domain: check: Type Inference Help Wanted

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

microsoft/TypeScript#59046 · 3 comments · 1 reaction · Opened Jun 26, 2024
Compiler Option typeTruncationLength Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#59035 · 5 comments · 7 reactions · Opened Jun 26, 2024
C extends A but C does not extend A | B Open

Domain: check: Variance Relationships Help Wanted Possible Improvement

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

microsoft/TypeScript#59034 · 3 comments · Opened Jun 26, 2024
`abstract class` should be usable in expressions Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#59031 · 4 comments · 1 reaction · Opened Jun 26, 2024
Enable npm Build Provenance Open

Infrastructure

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

microsoft/TypeScript#59028 · 2 comments · Opened Jun 25, 2024
Suspected breaking change with pushing and assigning a 'derived' value into a 'base' array Open

Domain: check: Excess Property Checking Help Wanted Possible Improvement

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

microsoft/TypeScript#59016 · 4 comments · Opened Jun 25, 2024
Consider making `WritableStreamDefaultWriter.write()` contravariant Open

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

microsoft/TypeScript#59012 · 2 comments · 4 reactions · 2 assignees · Opened Jun 25, 2024
Type 'any' cannot be used as an index type silently fails when used in generics (TS2538) Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#59009 · 1 comment · Opened Jun 25, 2024
Warn when regular expression is used in conditional Open

Experience Enhancement Suggestion

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

microsoft/TypeScript#59001 · Opened Jun 24, 2024
RTCStatsReport should inherit or extend from Map Open

Needs More Info

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

microsoft/TypeScript#58995 · 2 comments · 1 reaction · Opened Jun 24, 2024
`getJSDocTags` detects decorators inside code blocks as JSDoc tags Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#58992 · 1 comment · Opened Jun 24, 2024
Allow defering type check of default value for generic-typed function parameter until instantiation Open

Experimentation Needed Suggestion

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

microsoft/TypeScript#58977 · 7 comments · 10 reactions · Opened Jun 23, 2024
Isolated Declarations in TS 5.5: State of the feature Open

Discussion

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

microsoft/TypeScript#58944 · 27 comments · 53 reactions · Opened Jun 20, 2024
JSDoc: property access within static initialization block of @extends annotated class from different file Open

Bug Domain: JSDoc Help Wanted

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

microsoft/TypeScript#58943 · 1 comment · 1 reaction · Opened Jun 20, 2024
Crashes on transform and parse (from assertion/debug failures) Open

Bug Crash Domain: API: Transforms Effort: Casual Help Wanted

microsoft/TypeScript#58924 · 5 comments · 1 assignee · Opened Jun 19, 2024
"The inferred type of X cannot be named without a reference to Y" (TS2742) still happens, when working with npm link to link packages manually Open

Experience Enhancement Needs Investigation

microsoft/TypeScript#58914 · 19 comments · 7 reactions · 1 assignee · Opened Jun 18, 2024
use [""] in object will lose ts check Open

Awaiting More Feedback Domain: LS: Quick Info Suggestion

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

microsoft/TypeScript#58908 · 6 comments · 1 reaction · Opened Jun 18, 2024
Add support for beforeDeclarations Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#58880 · 1 comment · 1 reaction · Opened Jun 16, 2024
TypeScript refactoring: option to use `export default` with "Move to a new file" Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#58894 · Opened Jun 14, 2024
Inverted union type narrowing was broken in 4.9 Open

Bug Domain: check: Control Flow Help Wanted

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

microsoft/TypeScript#58861 · 2 comments · Opened Jun 14, 2024
5.4.5 nuget package is missing. Open

Visual Studio

microsoft/TypeScript#58843 · 3 comments · 1 assignee · Opened Jun 12, 2024
Nested generic calls don't inherit outer inferences when their return types are intersections containing functions Open

Domain: Intersection Help Wanted Possible Improvement

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

microsoft/TypeScript#58833 · 1 reaction · Opened Jun 12, 2024
auto-imports (import suggestions) randomly stopped working Open

Needs More Info

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

microsoft/TypeScript#60376 · 14 comments · 3 reactions · Opened Jun 10, 2024
Typescript 5.5 performance regression on arktype Open

Bug Domain: Performance

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

microsoft/TypeScript#58805 · 2 comments · Opened Jun 7, 2024
[isolatedDeclarations] Add a syntactic form of computed property name which is always emitted as a computed property name Open

Domain: flag: isolatedDeclarations

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

microsoft/TypeScript#58800 · 7 comments · 2 reactions · Opened Jun 7, 2024
Template Literal Type JSX children prop issue Open

Domain: JSX/TSX Help Wanted Possible Improvement

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

microsoft/TypeScript#58799 · 3 comments · 1 reaction · Opened Jun 7, 2024
False positive ts(2373) Open

Domain: Binder Help Wanted Possible Improvement

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

microsoft/TypeScript#58794 · Opened Jun 7, 2024
Feature request: Override and extend callback argument Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#58788 · 1 reaction · Opened Jun 6, 2024
Feature Request: Display JSDoc Array of Objects as Array Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#58901 · 4 comments · Opened Jun 5, 2024
`for (const x in #b)` is allowed Open

Bug Domain: Parser Help Wanted

Difficulty 3/5 1-2 days Newbie friendliness 58/100

microsoft/TypeScript#58754 · 1 comment · 1 reaction · Opened Jun 3, 2024
Delete or Change Unavailable YouTube Video in /why-create-typescript Open

Docs

microsoft/TypeScript#58751 · 1 reaction · 1 assignee · Opened Jun 3, 2024
Annotated parameters are not used for inferring rest parameters Open

Domain: check: Type Inference Help Wanted Possible Improvement

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

microsoft/TypeScript#58746 · 2 comments · Opened Jun 3, 2024
implicit 'any' in method with parameter of inferred generic type Open

Domain: check: Type Inference Help Wanted Possible Improvement

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

microsoft/TypeScript#58726 · 6 comments · Opened May 31, 2024
Visual hint when using a deprecated children prop in a React component Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#58902 · 1 reaction · Opened May 31, 2024
Non-exported recursive type alias is inlined until it falls back to any in declarations Open

Bug Domain: Declaration Emit Help Wanted

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

microsoft/TypeScript#58696 · 3 comments · Opened May 29, 2024
texSubImage2D missing WebGL2 syntax Open

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

Difficulty 3/5 1-2 days Newbie friendliness 65/100

microsoft/TypeScript#58695 · 1 comment · Opened May 29, 2024
[isolatedDeclarations] An option like disableSourceOfProjectReferenceRedirect, but configurable on the referenced project's end Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#58692 · 8 comments · 3 reactions · Opened May 29, 2024
TypeScript emits d.ts file that is invalid for complex mapped type. Open

Bug Domain: Declaration Emit

microsoft/TypeScript#58688 · 1 assignee · Opened May 29, 2024

microsoft/TypeScript

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