How to use the loopback-datasource-juggler.ValidationError function in loopback-datasource-juggler

if (after && after[delegateTo.name]) {
              self.afterRemote(m, function(ctx, result, next) {
                after[delegateTo.name]._listeners.call(null, ctx, next);
              });
            }
          }
        });
      });

    } else {
      var msg = g.f('Relation `%s` does not exist for model `%s`', relationName, this.modelName);
      throw new Error(msg);
    }
  };

  Model.ValidationError = require('loopback-datasource-juggler').ValidationError;

  /**
   * Create "options" value to use when invoking model methods
   * via strong-remoting (e.g. REST).
   *
   * Example
   *
   * ```js
   * MyModel.myMethod = function(options, cb) {
   *   // by default, options contains only one property "accessToken"
   *   var accessToken = options && options.accessToken;
   *   var userId = accessToken && accessToken.userId;
   *   var message = 'Hello ' + (userId ? 'user #' + userId : 'anonymous');
   *   cb(null, message);
   * });
   *

}
            if (after && after[delegateTo.name]) {
              self.afterRemote(m, function(ctx, result, next) {
                after[delegateTo.name]._listeners.call(null, ctx, next);
              });
            }
          }
        });
      });
    } else {
      var msg = g.f('Relation `%s` does not exist for model `%s`', relationName, this.modelName);
      throw new Error(msg);
    }
  };

  Model.ValidationError = require('loopback-datasource-juggler').ValidationError;

  /**
   * Create "options" value to use when invoking model methods
   * via strong-remoting (e.g. REST).
   *
   * Example
   *
   * ```js
   * MyModel.myMethod = function(options, cb) {
   *   // by default, options contains only one property "accessToken"
   *   var accessToken = options && options.accessToken;
   *   var userId = accessToken && accessToken.userId;
   *   var message = 'Hello ' + (userId ? 'user #' + userId : 'anonymous');
   *   cb(null, message);
   * });
   *

}
            if (after && after[delegateTo.name]) {
              self.afterRemote(m, function(ctx, result, next) {
                after[delegateTo.name]._listeners.call(null, ctx, next);
              });
            }
          }
        });
      });
    } else {
      const msg = g.f('Relation `%s` does not exist for model `%s`', relationName, this.modelName);
      throw new Error(msg);
    }
  };

  Model.ValidationError = require('loopback-datasource-juggler').ValidationError;

  /**
   * Create "options" value to use when invoking model methods
   * via strong-remoting (e.g. REST).
   *
   * Example
   *
   * ```js
   * MyModel.myMethod = function(options, cb) {
   *   // by default, options contains only one property "accessToken"
   *   var accessToken = options && options.accessToken;
   *   var userId = accessToken && accessToken.userId;
   *   var message = 'Hello ' + (userId ? 'user #' + userId : 'anonymous');
   *   cb(null, message);
   * });
   *

* Connectors
 */

loopback.Connector = require('./lib/connectors/base-connector');
loopback.Memory = require('./lib/connectors/memory');
loopback.Mail = require('./lib/connectors/mail');
if(loopback.isBrowser) {
  loopback.Server = require('./lib/connectors/server');
}

/**
 * Types
 */

loopback.GeoPoint = require('loopback-datasource-juggler/lib/geo').GeoPoint;
loopback.ValidationError = datasourceJuggler.ValidationError;