Type Alias RecursivePartial<T>

RecursivePartial: {
    [P in keyof T]?: T[P] extends (infer U)[]
        ? RecursivePartial<U>[]
        : T[P] extends object | undefined ? RecursivePartial<T[P]> : T[P]
}

Like Partial<T>, but applied recursively to all nested object properties. Array element types are also made recursively partial.