Hi all,
I am not able to use the “is” function of ModelUtils,js to get a specific node type array from a bpmn file, hope someone can help 
I started from the “bundling” example using the “pizza-collaboration.bpmn” and added my code inside the elementRegistry.filter function.
When I execute my code I have the following error message in the browser console:
“something went wrong: undefined Cannot read property ‘_createModdle’ of undefined”.
I run the app from VSCode, I first “compile” it with webpack and than run it with “npm run all”.
Here you can see my app.js code:
// we use stringify to inline an example XML document
import pizzaDiagram from '../resources/pizza-collaboration.bpmn';
// make sure you added bpmn-js to your your project
// dependencies via npm install --save bpmn-js
import BpmnViewer from 'bpmn-js';
// Custom line
import is from 'bpmn-js';
// END Custom line
var viewer = new BpmnViewer({
container: '#canvas'
});
viewer.importXML(pizzaDiagram).then(function(result) {
const { warnings } = result;
console.log('success !', warnings);
viewer.get('canvas').zoom('fit-viewport');
// Custom lines
let elementRegistry = viewer.get('elementRegistry');
let elements = elementRegistry.filter(function (element) {
return is(element, 'bpmn:Participant');
});
// END - Custom lines
}).catch(function(err) {
const { warnings, message } = err;
console.log('something went wrong:', warnings, message);
});
Thanks