Apply Partial Recursively on Object Types

partial-recurssive.ts

type PartialRecur<T> = T extends {} ? { [K in keyof T]?: PartialRecur<T[K]> } : T

Applies Partial recursively to all the key's value.
example:

type PartialRecur<T> = T extends {} ? { [K in keyof T]?: PartialRecur<T[K]> } : T
type APIResp = PartialRecur<{
    payload: {
        web_url: string
        created_at: {
            year: true
        }
    }
}>

// result: 
type APIResp = {
    payload?: {
        web_url?: string | undefined;
        created_at?: {
            year?: true | undefined;
        } | undefined;
    } | undefined;
}

Use-Case:

• server response should not be assumed to have certain fields, defining type for response object in this way forces us to use optional chaining while accessing object props.