[BUG]: Instanceof check fails

[AlexanderVishnevsky]

Hi there, I'm trying to check if type, but got the following error:
"TypeError: Right-hand side of 'instanceof' is not an object"

Code sample:

cloudConfig
    .load(springCloudServerConfig)
    .then((config: Config | Error) => {
        if (config instanceof Config) {
            console.log(config.get('server.port'));
}}).catch((e) => console.error('SpringCloudConfig Error', e));

[pods13]

@AlexanderVishnevsky just check that config is definied, i.e. if(config){console.log(config.get(...))} or you can also check that config is an object, i.e if(typeof config ==='object')
instance probably does not work because Config is an abstract class