Introduction to Keyof and Lookup Types

The keyof and lookup types in TypeScript allow you to work dynamically with keys and properties of existing types.

They make your code more flexible and reusable by letting you reference and extract types from objects.

What is keyof?

The keyof operator creates a type consisting of all the keys of an object type.

Example:

type Person = {
  name: string;
  age: number;
};
type PersonKeys = keyof Person;