DeepPartial

deep-partial.ts

type DeepPartial<Thing> = Thing extends Function
    ? Thing
    : Thing extends Array<infer InferredArrayMembmer>
    ? Array<DeepPartial<Thing>>
    : Thing extends object
    ? DeepPartialObject<Thing>
    : Thing | undefined;

type DeepPartialObject<Thing> = {
    [Key in keyof Thing]?: DeepPartial<Thing[Key]>;
}

interface Post {
    name: string;
    message: {
        name: string,
        author: string,
        body: string,
    };
    id: number;
}

const p: DeepPartial<Post> = {
    id: 222,
}