TypeScript: deep partial?

Question

Is there a way to specify a partial type in TypeScript that also makes all child objects partials as well? For example:

Answer 1

If you're looking for a quick and easy solution, check out the type-fest package, which has many useful prebuilt TypeScript types including the PartialDeep type.

For a more technical and customizable solution, see this answer.

Answer 2

You can simply create a new type, say, DeepPartial, which basically references itself:

type DeepPartial<T> = {
    [P in keyof T]?: DeepPartial<T[P]>;
};

Then, you can use it as such:

const foobar: DeepPartial<Foobar> = {
  foo: 1,
  bar: { baz: true }
};

See proof-of-concept example on TypeScript Playground.