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Collection of TypeScript type challenges
Now supports TypeScript 4.1 🎉


English | 简体中文 | 日本語

Intro

by the power of TypeScript's well-known Turing Completed type system

High-quality types can help improving projects' maintainability while avoiding potential bugs.

There are a bunch of awesome type utility libraries may boosting your works on types, like ts-toolbelt, utility-types, SimplyTyped, etc, which you can already use.

This project is aimed at helping you better understand how the type system works, writing your own utilities, or just having fun with the challenges. We are also trying to form a community that you can ask questions and get answers you have faced in the real world - they may become part of the challenges!

Challenges

Click the following badges to see details of the challenges.

1
13・Hello World

10
4・Pick 7・Readonly 11・Tuple to Object 14・First of Array 18・Length of Tuple 43・Exclude 189・Awaited 268・If 533・Concat 898・Includes

42
2・Get Return Type 3・Omit 8・Readonly 2 9・Deep Readonly 10・Tuple to Union 12・Chainable Options 15・Last of Array 16・Pop 20・Promise.all 62・Type Lookup 106・Trim Left 108・Trim 110・Capitalize 116・Replace 119・ReplaceAll 191・Append Argument 296・Permutation 298・Length of String 459・Flatten 527・Append to object 529・Absolute 531・String to Union 599・Merge 610・CamelCase 612・KebabCase 645・Diff 949・AnyOf 1042・IsNever 1097・IsUnion 1130・ReplaceKeys 1367・Remove Index Signature 1978・Percentage Parser 2070・Drop Char 2257・MinusOne 2595・PickByType 2688・StartsWith 2693・EndsWith 2757・PartialByKeys 2759・RequiredByKeys 2793・Mutable 2852・OmitByType 2946・ObjectEntries

29
6・Simple Vue 17・Currying 1 55・Union to Intersection 57・Get Required 59・Get Optional 89・Required Keys 90・Optional Keys 112・Capitalize Words 114・CamelCase 147・C-printf Parser 213・Vue Basic Props 223・IsAny 270・Typed Get 300・String to Number 399・Tuple Filter 472・Tuple to Enum Object 545・printf 553・Deep object to unique 651・Length of String 2 730・Union to Tuple 847・String Join 956・DeepPick 1290・Pinia 1383・Camelize 2059・Drop String 2822・Split 2828・ClassPublicKeys 2857・IsRequiredKey 2949・ObjectFromEntries

12
5・Get Readonly Keys 151・Query String Parser 216・Slice 274・Integers Comparator 462・Currying 2 476・Sum 517・Multiply 697・Tag 734・Inclusive Range 741・Sort 869・DistributeUnions 925・Assert Array Index

By Tags
#application12・Chainable Options 6・Simple Vue 213・Vue Basic Props
#arguments191・Append Argument
#array14・First of Array 533・Concat 898・Includes 15・Last of Array 16・Pop 20・Promise.all 459・Flatten 949・AnyOf 17・Currying 1 2822・Split 216・Slice 734・Inclusive Range 741・Sort 925・Assert Array Index
#built-in4・Pick 7・Readonly 43・Exclude 2・Get Return Type 3・Omit 20・Promise.all
#deep9・Deep Readonly 553・Deep object to unique 956・DeepPick
#infer2・Get Return Type 10・Tuple to Union 2070・Drop Char 55・Union to Intersection 57・Get Required 59・Get Optional 399・Tuple Filter 730・Union to Tuple 2059・Drop String 734・Inclusive Range 741・Sort
#map62・Type Lookup
#math529・Absolute 2257・MinusOne 274・Integers Comparator 476・Sum 517・Multiply
#object599・Merge 645・Diff 2595・PickByType 2757・PartialByKeys 2759・RequiredByKeys 2852・OmitByType 2946・ObjectEntries 2949・ObjectFromEntries
#object-keys7・Readonly 8・Readonly 2 9・Deep Readonly 527・Append to object 2793・Mutable 5・Get Readonly Keys
#promise189・Awaited
#readonly7・Readonly 8・Readonly 2 9・Deep Readonly 2793・Mutable
#recursion1383・Camelize
#split2822・Split
#string531・String to Union 2822・Split
#template-literal106・Trim Left 108・Trim 110・Capitalize 116・Replace 119・ReplaceAll 298・Length of String 529・Absolute 610・CamelCase 612・KebabCase 2070・Drop Char 2688・StartsWith 2693・EndsWith 112・Capitalize Words 114・CamelCase 147・C-printf Parser 270・Typed Get 300・String to Number 472・Tuple to Enum Object 545・printf 651・Length of String 2 2059・Drop String 151・Query String Parser 274・Integers Comparator 476・Sum 517・Multiply
#this6・Simple Vue 1290・Pinia
#tuple18・Length of Tuple 10・Tuple to Union 399・Tuple Filter 472・Tuple to Enum Object 730・Union to Tuple 2822・Split
#union4・Pick 3・Omit 10・Tuple to Union 62・Type Lookup 296・Permutation 531・String to Union 1042・IsNever 730・Union to Tuple 1383・Camelize
#utils268・If 1042・IsNever 55・Union to Intersection 57・Get Required 59・Get Optional 89・Required Keys 90・Optional Keys 223・IsAny 270・Typed Get 2828・ClassPublicKeys 2857・IsRequiredKey 5・Get Readonly Keys
#vue6・Simple Vue 213・Vue Basic Props 1290・Pinia
          

✨ Upcoming challenges

Recommended Readings

Official

Articles

Projects / Solutions

TODO

How to Contribute

There are several ways you can contribute to this project

  • Share your answers / solutions
  • Propose new challenges
  • Add more test cases to the existing challenges
  • Provide learning resources or ideas of how to solve challenges
  • Share the problems you have faced in realworld projects, regardless you having the solution or not - the community would help you as well.
  • Help with others by discussion in issues
  • Contribute the infra of this project TODOs.md

Just open an issue and choose the cosponsing template. Thanks!

Thanks

This project was born from solving realworld types problem with @hardfist and @MeCKodo. And great thanks to @sinoon who contributed a lot while giving early feedback on this project.

Inspired by

Contributors

License

MIT