use Partial in nested property with typescript

Question

Say I have a type like this;

interface State {
  one: string,
  two: {
    three: {
      four: string
    },
    five: string
  }
}

I make

Answer 1

You can pretty easily define your own RecursivePartial type, which will make all properties, included nested ones, optional:

type RecursivePartial = {
    [P in keyof T]?: RecursivePartial;
};

If you only want some of your properties to be partial, then you can use this with an intersection and Pick:

type PartialExcept = RecursivePartial & Pick;

That would make everything optional except for the keys specified in the K parameter.