(fix): fix compiler error
(fix): fix compiler error

swimlane/ngx-datatable,achimha/ngx-datatable,swimlane/ngx-datatable,swimlane/angular2-data-table,achimha/ngx-datatable,achimha/ngx-datatable,swimlane/angular2-data-table,swimlane/angular2-data-table,swimlane/ngx-datatable