type Diff<T extends string | number | symbol, U extends string | number | symbol> = ({ [P in T]: P } &
  { [P in U]: never } & { [x: string]: never })[T]

export type Omit<T, K extends keyof T> = Pick<T, Diff<keyof T, K>>

export type SingleOrArray<Properties, T extends keyof Properties> = {
  [P in T]: Properties[P] | Array<Properties[P]>
}