Extract is another utility type that is available in Typescript. It allows us to extract a member from a type and create a new type.

Example

type Vehicles =
  | { make: 'BMW', model: '325', type: 'sedan' }
  | { make: 'BMW', model: '525', type: 'sedan' }
  | { make: 'BMW', model: 'X6', type: 'SUV' };

type SUV = Extract<Vehicles, {type: 'SUV'}> 

If we put the mouse pointer over the type SUV, we would get the following:

{
  make: 'BMW',
  model:  'X6',
  type: 'SUV'
}