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/** * Like the 'Required' builtin type alias helper * but it only keeps properties that are marked optional. * * Example: * * Optional<{ p1: string; p2?: string; p3?: number; }> * is the type * { p2: string; p3: number } */
type OptionalKeyof<T extends Record<string, unknown>> = Exclude<    {        [Key in keyof T]: T extends Record<Key, T[Key]> ? never : Key;    }[keyof T],    undefined>;
export type PickOptionals<T extends Record<string, unknown>> = {    [Key in OptionalKeyof<T>]: T[Key];};