This project
npm run start

Chrome browser
ie11:
We dropped support for IE11 in bpmn-js@7.0.0. You need to polyfill Promise in order to use the library in that browser.
More on that: https://github.com/bpmn-io/bpmn-io-callbacks-to-promises
Closing old topics. If you have a similar question or need further assistance, please create a new topic and link to this one for context. Thank you!