README.md

TypeType Examples

This repository contains examples of using typetype to create typescript types, typetype is designed to generate complex typescript type with ease.

For example, to implement StringToUnion in 531-medium-string-to-union:

export type function StringToUnion = (T extends string) => ^{
    if(T extends `${infer char}${infer rest}`) {
        return union [char, StringToUnion<rest>]
    } else {
        return never
    }
}

The output will be:

export type StringToUnion<T extends string> = T extends `${infer char}${infer rest}` ? (char | StringToUnion<rest>) : never;

See it in action!

• https://mistlog.github.io/typetype-playground/

Outline

foreach example-set in this repo:
    input = examples/<example-set>/<example-name>.type
    output = examples/<example-set>/<example-name>.ts
    test = examples/<example-set>/<example-name>.test.ts

• syntax: the grammar of typetype
• url-parser
  • url-parser: simple url parser, parse individual part of url
  • url-parser-2: parse url as a whole
• type-challenges
  • solutions of type-challenges in typetype

Local setup

> npm install
> npm run dev

License

This project is MIT licensed.