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

Shortcut for creating local variable from all occurrences Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#57448 · 1 reaction · Opened Feb 9, 2024
Assign existing interface to global (globalThis) Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#57353 · 1 comment · 8 reactions · Opened Feb 9, 2024
Class member incorrectly stripped from .d.ts output if @internal is mentioned in unrelated comment Open

Domain: Declaration Emit Help Wanted Possible Improvement

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

microsoft/TypeScript#57352 · 6 comments · 2 reactions · Opened Feb 9, 2024
Inconsistent type inference on overloaded function types Open

Domain: check: Type Inference Has Repro Help Wanted Possible Improvement

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

microsoft/TypeScript#57351 · 8 comments · 4 reactions · Opened Feb 9, 2024
Autocomplete static methods and fields Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#57331 · 1 reaction · Opened Feb 8, 2024
ts2556 is too restrictive when generics are involved Open

Domain: check: Type Inference Help Wanted Possible Improvement

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

microsoft/TypeScript#57322 · 2 comments · 3 reactions · Opened Feb 7, 2024
Intersection of merged declarations - function types behave inconsistently Open

In Discussion Suggestion

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

microsoft/TypeScript#57319 · 5 comments · Opened Feb 7, 2024
Make `instanceof` narrow better using an anonymous class returned from a function Open

Domain: check: Control Flow Help Wanted Possible Improvement

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

microsoft/TypeScript#57317 · 4 comments · 3 reactions · Opened Feb 7, 2024
Add object shape inference to TypeScript mode (already in JSDoc+JavaScript mode) Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#57306 · 3 comments · 3 reactions · Opened Feb 6, 2024
[Decorators] Missing error when calling `addInitializer` after that the decorator is done Open

Needs Investigation

microsoft/TypeScript#57300 · 3 comments · 1 assignee · Opened Feb 5, 2024
When generating declaration file from a JavaScript file with JSDoc, description of named parameters should be copied to description of the properties in the generated object type Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#57269 · Opened Feb 2, 2024
mapped type with remapped keys unexpectedly widens type Open

Has Repro Needs Investigation

microsoft/TypeScript#57265 · 12 comments · 1 assignee · Opened Feb 1, 2024
Subclass of a (non-abstract class that uses declaration merging to implement parent abstract member) also has to implement same abstract member Open

Bug Domain: classes Help Wanted

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

microsoft/TypeScript#57263 · 1 reaction · Opened Feb 1, 2024
The class is accessible from the field decorator expression when Babel and the Proposal Playground throw a ReferenceError Open

Needs Investigation

microsoft/TypeScript#57247 · 1 assignee · Opened Jan 31, 2024
Discriminated unions is not work when field key is number Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#57245 · 9 comments · Opened Jan 31, 2024
Issue better errors for `?.` and `!.`in type-space Open

Domain: Error Messages

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

microsoft/TypeScript#57244 · 3 comments · 2 reactions · Opened Jan 30, 2024
static fields should be installed on the decorated class Open

Bug Domain: Decorators

microsoft/TypeScript#57237 · 3 comments · 1 assignee · Opened Jan 30, 2024
discriminated union type matching behaviour changed starting from 5.2.x Open

Domain: check: Control Flow Help Wanted Possible Improvement

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

microsoft/TypeScript#57231 · 6 comments · Opened Jan 30, 2024
.d.json.ts file (allowArbitraryExtensions) not working correctly when importing from ESM file with node16/nodenext module setting Open

Breaking Change Bug Domain: Node ESM Rescheduled

microsoft/TypeScript#57229 · 4 comments · 2 reactions · 1 assignee · Opened Jan 30, 2024
strictBindCallApply error mentions `this` type mismatch, but elaboration points to parameters, even when `this` type matches Open

Experience Enhancement Help Wanted Suggestion

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

microsoft/TypeScript#57225 · Opened Jan 30, 2024
Provide API to operate with JSDoc nodes attaches to nodes Open

In Discussion Suggestion

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

microsoft/TypeScript#57219 · 4 comments · Opened Jan 29, 2024
Runtime error when a derived class has uninitialized decorated field and a constructor with nested super call Open

Needs Investigation

microsoft/TypeScript#57212 · 1 assignee · Opened Jan 29, 2024
Mapped types created from reverse mapped types with union/intersection constraints don't have declaration linked Open

Domain: Mapped Types Help Wanted Possible Improvement

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

microsoft/TypeScript#57211 · 1 reaction · Opened Jan 29, 2024
Generic type comparison results in incorrect error when inferring from undefined type Open

Domain: Error Messages Help Wanted Possible Improvement

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

microsoft/TypeScript#57203 · 2 comments · 1 reaction · Opened Jan 28, 2024
TS doesn't watch files for changes Open

Needs More Info

microsoft/TypeScript#57330 · 5 comments · 1 assignee · Opened Jan 26, 2024
TypeScript cannot always infer the correct type through a user-defined type guard using the 'is' operator. Open

Bug Domain: This-Typing Help Wanted

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

microsoft/TypeScript#57189 · 4 comments · 1 reaction · Opened Jan 26, 2024
Add structure to diagnostics to enable nicer diagnostic output and interactivity in tooling such as IDEs Open

In Discussion Suggestion

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

microsoft/TypeScript#57180 · 6 comments · 2 reactions · Opened Jan 25, 2024
Wrong error message for testing `void` with `??` Open

Domain: Error Messages Experience Enhancement Suggestion

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

microsoft/TypeScript#57172 · 1 comment · Opened Jan 25, 2024
Allow `abstract` modifier on construct signature in object type literal Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#57171 · 3 comments · 3 reactions · Opened Jan 25, 2024
unique symbol + interface + mixin causes TS4058 ("but cannot be named") Open

Bug Domain: Declaration Emit Help Wanted

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

microsoft/TypeScript#57165 · 5 comments · 3 reactions · Opened Jan 25, 2024
Function apply does not accept `arguments` Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#57164 · 13 comments · 5 reactions · Opened Jan 25, 2024
Respect Node's `--loader` for VS Code Intellisense Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#57129 · 3 comments · Opened Jan 22, 2024
Find All References does not report references in mapped types Open

Experience Enhancement Help Wanted Suggestion

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

microsoft/TypeScript#57115 · Opened Jan 21, 2024
Literal tested as key of a certain type cannot be used as an index type Open

Bug Domain: Indexed Access Types Help Wanted

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

microsoft/TypeScript#57109 · 1 comment · 2 reactions · Opened Jan 20, 2024
ConstructorParameters<T> should suggest `typeof T` when T is a reference to classes Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#57106 · 1 comment · Opened Jan 20, 2024
Return types of intersection of functions are incomplete and depend on order of declaration - an algorithm to fix it. Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#57095 · 9 comments · Opened Jan 19, 2024
Overly strict matching of function overloads to function intersections, and an algorithm that could help Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#57087 · Opened Jan 18, 2024
Typescript - inlay hints for nested labeled tuples Open

Bug Domain: LS: Inlay Hints Help Wanted

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

microsoft/TypeScript#57088 · 1 reaction · Opened Jan 18, 2024
No semantic token assigned to import names, but available for export Open

Experience Enhancement Help Wanted Suggestion

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

microsoft/TypeScript#57082 · 2 comments · 5 reactions · Opened Jan 18, 2024
Modify Parameters Utility in case of union/intersection of function types Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#57074 · Opened Jan 16, 2024
partial function with generic lost the type constraint Open

Domain: check: Type Inference Help Wanted Possible Improvement

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

microsoft/TypeScript#57072 · 1 comment · Opened Jan 16, 2024
Compiler option to require final "catch-all" case in overload declarations Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#57057 · 6 comments · 1 reaction · Opened Jan 14, 2024
Document and/or deprecate Node's getFullStart() vs. pos? Open

Help Wanted Infrastructure

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

microsoft/TypeScript#57053 · 1 comment · Opened Jan 14, 2024
Misleading error message when interface tries to extend constrained type parameter Open

Domain: Error Messages Help Wanted Possible Improvement

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

microsoft/TypeScript#57037 · 1 comment · 2 reactions · Opened Jan 12, 2024
Cannot describe recursive type aliases like JSON in terms of generic mapped types Open

In Discussion Suggestion

microsoft/TypeScript#57034 · 1 comment · 7 reactions · 1 assignee · Opened Jan 12, 2024
Expose `TypeChecker.getTypeOnlyAliasDeclaration` or similar API to detect if a symbol is a "value" or a "type" Open

In Discussion Suggestion

microsoft/TypeScript#57032 · 20 comments · 1 assignee · Opened Jan 12, 2024
Rename doesn't work on declaration whose name is a string literal Open

Domain: LS: Refactorings Experience Enhancement Help Wanted Suggestion

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

microsoft/TypeScript#57026 · 5 reactions · Opened Jan 11, 2024
Generic indexed access on type with optional properties doesn't include `undefined` in its constraint in `exactOptionalPropertyTypes` Open

Domain: flag: exactOptionalPropertyTypes Help Wanted Possible Improvement

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

microsoft/TypeScript#57023 · 2 comments · Opened Jan 11, 2024
Add the possibility to import Types from global loaded Librarys Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#57019 · 19 comments · Opened Jan 11, 2024
Provide Compiler API way to disable type checking for a source file Open

Awaiting More Feedback Suggestion

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

microsoft/TypeScript#57015 · 2 comments · 1 reaction · Opened Jan 11, 2024

microsoft/TypeScript

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