// Gathers all the required keys from an interface/type T
export type RequiredKeys<T> = {
  [K in keyof T]-?: {} extends { [P in K]: T[K] } ? never : K;
}[keyof T];

// Gathers all the optional keys from an interface/type T
export type OptionalKeys<T> = {
  [K in keyof T]-?: {} extends { [P in K]: T[K] } ? K : never;
}[keyof T];

// Picks all the optional keys from interface/type T
export type PickOptional<T> = Pick<T, OptionalKeys<T>>;

// Picks all the optional keys from interface/type T and makes them required
// so that they cannot be accidentally omitted when providing default values
export type PickAndRequireOptional<T> = Required<Pick<T, OptionalKeys<T>>>;

export type DropEvent = React.DragEvent<HTMLElement> | React.ChangeEvent<HTMLInputElement> | DragEvent | Event;