class type configs =Inheritsobject..end
method fields : Js.js_string Js.t Js.js_array Js.t Js.propThe fields of model to bind to this axis.
For example if you have a data set of lap times per car, each having the fields:
'carName', 'avgSpeed', 'maxSpeed'. Then you might want to show the data on chart
with ['carName'] on Name axis and ['avgSpeed', 'maxSpeed'] on Speed axis.
method label : Ext_chart_Label.t Js.t Js.propThe config for chart label.