Type description + examples

I am unsure of the right name for a type like this, but will explain the use-case:

Given a function f, that takes an argument of type T (i.e. function f(t: T) I would like to create the following class:

import defaults from 'defaults';

class Helper<B extends PartialDeep<T>> {
  private base: B;

  constructor(base: B) {
    this.b = b;
  }

  // I want `DeepPartialDiff` to make optional anything that has been passed in the constructor, but keep required anything NOT passed in the constructor.
  runF(overrides: DeepPartialDiff<T, B>): ReturnType<typeof f> {
    return f(defaults(overrides, this.base));
  }
}

Type source

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