Typescript类型体操 - Diff

题目

中文

获取两个接口类型中的差值属性。

type Foo = {
    a: string;
    b: number;
};
type Bar = {
    a: string;
    c: boolean;
};

type Result1 = Diff<Foo, Bar>; // { b: number, c: boolean }
type Result2 = Diff<Bar, Foo>; // { b: number, c: boolean }

English

Get an Object that is the difference between O & O1

答案

type MyExclude<T, K> = T extends K ? never : T;
type Diff<O extends {}, O1 extends {}> = {
    [P in MyExclude<keyof O, keyof O1> | MyExclude<keyof O1, keyof O>]: (O &
        O1)[P];
};

在线演示