How to change the default error output in restify 7.x?

I changed the default error output in restify 4.x using the below code

`var restify = require('restify');
var util = require('util');

function ValidationError(message, errors) {
restify.RestError.call(this, {
restCode: 'ValidationError',
statusCode: 400,
message: message,
constructorOpt: ValidationError
});
this.name = 'ValidationError';
this.body.errors = errors; //<---
}

util.inherits(ValidationError, restify.RestError);`

And I got the desired result. Now am in a process of migrating my project to restify 7.x. So I couldn't use the restify.RestError, I have tried 'restify-errors-options' package's subclassing property but it doesn't work for me. I have tried the below code
restifyErrors.makeConstructor('ValidationError', { restCode: 'ValidationError', statusCode: 400, message: message }); var myErr = new errors.ValidationError( );

And I ended up with the below error

var myErr = new errors.ValidationError(); ^

TypeError: errors.ValidationError is not a constructor

So can anyone suggest a solution for this problem?

Start by comparing the restify 4.x RestError usage in the report with restify 7.x and the restify-errors-options makeConstructor example. Reproduce the errors.ValidationError constructor failure, then document the supported migration path and the expected custom error output.