In TypeScript, the NonNullable type is like Required, but it ensures that all object properties are converted to non-

When working with TypeScript, you may have come across the Required type which transforms object properties into defined ones.

For instance:

interface Person {
  name?: string;
  age?: number;
}

Using Required<Person> will result in:

interface Person {
  name: string;
  age: number;
}

Now, my inquiry is whether there exists a similar type that can convert nullable properties to non-nullable ones.

Consider the following scenario:

interface Person {
  name: string | null;
  age: number | null;
}

Desired outcome:

interface Person {
  name: string;
  age: number;
}

Appreciate any insights!

Answer №1

:)

const RequiredFields<T> = {
  [P in keyof T]-?: NonNullable<T[P]>;
}

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