arrow-express/lib/utils/types.ts

Library to bootstrap express applications with zero configuration

export type IsUndefined<T> = undefined extends T ? (T extends undefined ? true : false) : false;

export type IsNever<T> = [T] extends [never] ? true : false;

export type IsUnknown<T> = unknown extends T ? (T extends unknown ? true : false) : false;

export type IsUndefinedOrNeverOrUnknown<T> = IsUndefined<T> extends true
  ? true
  : IsNever<T> extends true
  ? true
  : IsUnknown<T> extends true
  ? true
  : false;