export class User {
  readonly email: string;

  readonly firstName: string;

  readonly lastName: string;

  private constructor(props: UserConstructorArgs) {
    this.email = props.email;
    this.firstName = props.firstName;
    this.lastName = props.lastName;
  }

  static build({
    email,
    firstName,
    lastName,
  }: {
    email: string;
    firstName: string;
    lastName: string;
  }): Either<Failure<UserError.InvalidCreationArguments>, User> {
    if ([email, firstName, lastName].some(field => field.length === 0)) {
      return left(invalidCreationArgumentsError());
    }
    return right(new User({ email, firstName, lastName }));
  }
}