omit type

• omit type : https://www.typescriptlang.org/docs/handbook/utility-types.html#omittype-keys

interface Todo {
  title: string;
  description: string;
  completed: boolean;
  createdAt: number;
}

// Todo 타입에서 description만 제거하여 새로운 타입으로 만듦
type TodoPreview = Omit<Todo, "description">;

const todo: TodoPreview = {
  title: "Clean room",
  completed: false,
  createdAt: 1615544252770,
};

// Todo 타입에서 completed와 createdAt만 제거하여 새로운 타입으로 만듦
type TodoInfo = Omit<Todo, "completed" | "createdAt">;

const todoInfo: TodoInfo = {
  title: "Pick up kids",
  description: "Kindergarten closes at 5pm",
};