this.instanceManager.instanceCount - used to determine total number of repeatable instances/rowsthis.instanceIndex - used to fetch current row index#(typically starts from 0,1,2..) if(this.instanceManager.instanceCount === this.instanceIndex+1){//add specific script for the last instance/row}  

If you've configured Client Library category in the Form container; remove it and save it, but don't reload the page. And then try opening the Rule editor, it will work. Once you're done with the Code changes, configure the Client Library category again in Form Container; save and reload the page.It...