TypeScript Omit Pick Partial 的用法

Omit

Omit<原类型, 要删除的键>，使用|选择多个键

interface User {
    name: string,
    age: number,
    password: string
}

type UserWithoutPwd = Omit<User, 'password'>;

const userWithoutPwd: UserWithoutPwd = {
    name: 'zhangsan',
    age: 18,
}

Pick

Pick<原类型, 要保留的键>，使用|选择多个键

interface User {
    name: string,
    age: number,
    password: string
}

type UserWithoutPwd2 = Pick<User, 'name' | 'age'>;

const userWithoutPwd: UserWithoutPwd = {
    name: 'lisi',
    age: 20,
}

Partial

Partial<T>，将泛型中指定的类型中的所有字段变为可选。

interface User {
    name: string,
    age: number,
    password: string
}

type PartialUser = Partial<User>;

const partialUser = {
    name: 'wangwu'
}

等价于

{name?: string, age?: number, password?: string}