Function mixin

Function to mixin multiple classes together and create a new class, which can be extended from.

The first entry of the mixin() call will be used as base class.

Example

  class Timestampable {
      createdAt: Date = new Date;
      updatedAt: Date = new Date;
  }

  class SoftDeleted {
      deletedAt?: Date;
      deletedBy?: string;
  }

  class User extends mixin(Timestampable, SoftDeleted) {
      id: number = 0;
      constructor(public username: string) {}
  }