We do not have that file in our solution
the ../../lib/Scheduler/column/ folder contains only
ResourceInfoColumn.js
TimeAxisColumn.js and
VerticalTimeAxisColumn.js
However I can import it from the npm installed package:
import { Scheduler, ObjectHelper, Widget, resourceCollapse } from 'bryntum-scheduler/scheduler.umd';
But that is in the core scheduler file and not where I need it.