[Solved]-How to call Highcharts tooltip formatter function from outside the config object?-Highcharts

var formatplotband = _.curry((color, alert) => {
return {
    color : color,
    from  : alert.start_epoch * 1000,
    to    : alert.end_epoch * 1000,
    id    :'alert-plotband',
    events: {
        mouseover: function (e) {
            vm.config.options.tooltip.formatter(tooltipobj);
            chart.tooltip.refresh([chart.series[0].points[i]])
        },
        mouseout: function (e) {
            ....

i don't know if vm is what you're calling your chart so replace chart in the code with whatever variable name you're using.