• Utility types for creating new types from existing ones
• Type guards and type predicates for checking type safety
• Type transformations for modifying existing types

npm install type-fest
import type {Except} from 'type-fest';
type Foo = {
  unicorn: string;
  rainbow: boolean;
};
type FooWithoutRainbow = Except<Foo, 'rainbow'>;
//=> {unicorn: string}