TypeScript: Same as Pick<...>, but with multiple fields

Question

I use Pick, but how could I write a generic PickMulti which can pick multiple fields?

interface MyInterface {
  a: number,
  b: number,
  c: number
}

// this works, but I would like a generic one in number of fields
type AB = Pick<Pick<MyInterface, 'a'>, 'b'>;

// Something like this:
type PickMulti = /* how to write this?*/;
type AB = PickMulti<MyInterface, ['a', 'b']>

Answer 1

Pick already works with multiple fields you just need to provide them as a union, not a tuple/array type:

interface MyInterface {
  a: number,
  b: number,
  c: number
}

type AB = Pick<MyInterface, 'a' | 'b'>;

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