Lab

TypeScript type lab

The same compiler the daily puzzle uses, with nothing to solve. Write a type, run it, and see what it actually resolves to — then share the link, which carries your code in the URL fragment and never sends it anywhere.

Scratch

scratch.ts

// Anything you write here is type-checked for real, in your browser.
// Every plain `type X = ...` gets its resolved type printed below.

type Pretty<T> = { [K in keyof T]: T[K] }

type User = { id: number; name?: string }

type Result = Pretty<User & { admin: true }>

// Anything you write here is type-checked for real, in your browser.
// Every plain `type X = ...` gets its resolved type printed below.

type Pretty<T> = { [K in keyof T]: T[K] }

type User = { id: number; name?: string }

type Result = Pretty<User & { admin: true }>

The link carries your snippet in the fragment. Fragments are never sent to a server — not ours, not anyone’s.

Resolved types

Not checked yet.

Problems

Not checked yet.