Custom error builder in javascript

BuildError.js

export function BuildError(object) {  
  // Throw an error if the 'object' param doesn't pass the follow rules:
  // 1. If the object param is not an object
  // 2. If the object param doesn't include a property 'message'
  // 3. If the object param includes the property 'message' but is not of string type
  // 4. If the object param includes the property 'message' but it is empty
  if (!object.hasOwnProperty('message') || typeof object.message !== 'string') {
    throw new Error('Error when trying to build a new error');
  }
  
  // As everything is ok, we proceed to create a new Error using the message:
  let error = new Error(object.message);
  
  // As we've got the custom error we need to check if there are more properties:
  Object.keys(object).reduce((source, key) => {

    // As we already have the property 'message' in out custom error we just skip it and we continue adding the rest of them:
    if (key !== 'message') {
      source[key] = object[key];
    }
    
    // Return the error with all the custom properties:
    return error;
  }, error);
  
  // Return the error:
  return error;
}