type Optional<T extends {}, O extends keyof T> = any;
 
type Person = { name: string; age: number; phone: number };
type OptionalAge = Optional<Person, "age">; // {name:string, age?:number, phone:number}
type OptionalAgePhone = Optional<Person, "age" | "phone">; // {name:string; age?:number;phone?:number }