Watson Discovery API - NodeJS not working as expected

Following discovery API Node snippet it seems to exists a bug:

var DiscoveryV1 = require('watson-developer-cloud/discovery/v1');

var discovery = new DiscoveryV1({
  username: '{username}',
  password: '{password}',
  version_date: '2016-12-01'
});

discovery.createCollection(('{environment_id}', '{collection_name}', '{description}' '{configuration_id}'), function(error, data) {
  console.log(JSON.stringify(data, null, 2));
});

When I tried:

var params;
params = {description:'test',collection_name:'name test',environment_id:'xxxxxxx',
       configuration_id:'xxxxxxx'};

discovery.createCollection(params, function(error, data) {
        if(error){
                console.log(error);
        }
  console.log(JSON.stringify(data, null, 2));
});

I got the error: { Error: Invalid or missing collection name, name is a required parameter

It seems to be a documentation or module bug. Did anyone else got the same error? It is working fine using Java Snippet and manually POST/curl

via Ricardo Gil