value-object.ts

export default class ValueObject {
  private readonly value: string;
  
  constructor(value: string) {
    if (!value) {
      throw new ValidationError("ValueObject value cannot be empty");
    }
    
    this.value = value;
  }
  
  map(fn: (value: string) => string): ValueObject {
    return new ValueObject(fn(this.value));
  }

  equals(otherValue: ValueObject): boolean {
    return otherValue.value === this.value;
  }
  
  valueOf(): string {
    return this.value;
  }
  
  static create(value: string): Result<ValueObject, BaseError> {
    try {
      let val = new ValueObject(value);
      return ok<ValueObject, BaseError>(val);
    } catch (error) {
      return err<ValueObject, BaseError>(error);
    }
  }
}