Ionic 4: Dhtmlx scheduler not working in the app


i am trying to use dhtmlx scheduler which is used in my previous project using ionic 1 and angularjs. i tried use same library from npm( ) and followed this tutorial( to implement scheduler view in the app using ionic 4 and angular. i have created a app using ‘ionic start myapp blank’ and followed the above tutorial but i am getting
error: Cannot find name ‘scheduler’.

can anyone suggest the solution for this please.Thanks in advance

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i think it’s angular 5.x

yeah but still it should work right.