# type-challenges/type-challenges

Collection of TypeScript type challenges with online judge

Repository: https://github.com/type-challenges/type-challenges
Canonical: https://ross.abutalabs.com/products/type-challenges
Homepage: https://tsch.js.org/
Language: TypeScript
License: MIT
License Family: permissive
Topics: typescript, type, type-system, challenges
Last push: 2026-05-16T14:20:30+00:00

## Health v2 (maintenance only)
Score: 69/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 82, release rhythm 35, longevity 100
- inputs: {"age_days": 2232, "days_push": 109, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 48474, forks 5272 (observed 2026-08-28T04:12:11.449621+00:00)

## What it is
A collection of TypeScript type-level programming challenges with an online judge for verifying solutions. It helps developers learn and master TypeScript's type system through exercises ranging from warm-up to extreme difficulty.

## Use cases
- practice TypeScript type system exercises
- learn advanced TypeScript type programming
- prepare for TypeScript interviews with type challenges
- find coding katas for TypeScript generics and conditional types
- test my solutions to type puzzles with an online judge
- improve my skills writing TypeScript utility types

## When to choose
- you want structured, graded exercises for TypeScript's type system
- you prefer solving challenges in an online playground with automatic verification
- you want a community-maintained, multi-language resource with many difficulty levels

## When to avoid
- you need a runtime type-validation or utility type library for production code
- you are looking for general TypeScript tutorials rather than type-level puzzles
- you want challenges for languages other than TypeScript

## Facets
- artifact type: learning-resource
- maturity: active
- function: type-system, testing, developer-tools
- domain: programming-languages, education, tutorials, developer-tools
- platform: browser
- tags: typescript, type-challenges, online-judge, coding-exercises, type-gymnastics, learning, web, nodejs

## Member repositories
- type-challenges/type-challenges (main) score 69

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:12:11.449621+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T16:20:44.978327+00:00, confidence not recorded.
  - readme: https://github.com/type-challenges/type-challenges (fetched 2026-08-28T04:12:11.449621+00:00, sha 744317427c20)
  - homepage: https://tsch.js.org/ (fetched 2026-08-29T07:42:00.584823+00:00, sha 633e77293bce)
- Data as of 2026-08-30T08:39:29.467469+00:00.