import inherits from "inherits"; import Viewer from "bpmn-js/lib/Viewer"; import ZoomScrollModule from "diagram-js/lib/navigation/zoomscroll"; import MoveCanvasModule from "diagram-js/lib/navigation/movecanvas"; function CustomViewer(options) { Viewer.call(this, options); } inherits(CustomViewer, Viewer); CustomViewer.prototype._modules = [].concat(Viewer.prototype._modules, [ZoomScrollModule, MoveCanvasModule]); export { CustomViewer };