why does jqxgrid not work in IE 11 but works in chrome

Question

I am using JQxGrid within my Angular 8 application and while everything works in IE 11, if I add the jqxGridModule with just import in appModule.ts it fails in IE with following error in vendor.js

var dataType = that.source._source.dataFields.find(gridField => gridField.name === dataField).type;

Any help appreciated