Creating a JSON utility type for an already existing type, such as JSON<SomeExistingType>

Is there any tool or utility available that can accomplish this task?

const foo: Foo = { ... }
const bar: string = JSON.stringify(foo)
const baz: JSON<Foo> = JSON.parse(foo)

JSON<Foo> would essentially mirror all the properties of Foo, with the alterations made by JSON.stringify

Answer №1

It appears that I have found exactly what I was searching for https://github.com/microsoft/TypeScript/issues/1897

type Json =
  | null
  | boolean
  | number
  | string
  | Json[]
  | { [prop: string]: Json };

type JsonCompatible<T> = {
  [P in keyof T]: T[P] extends Json
    ? T[P]
    : Pick<T, P> extends Required<Pick<T, P>>
    ? never
    : T[P] extends (() => any) | undefined
    ? never
    : JsonCompatible<T[P]>;
};

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