Chartjs-Call ChartJS details in main Javascript file

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I think the variable chart is unknown in the scope of main.js. Therefore, you would need to provide the chart variable to show_info like so:

// main.js
function show_info(my_object) { 

alert(my_object.data.labels[activeEls[0].index]);
}

// other file
onClick: (evt, activeEls, chart) => {
    show_info(chart);
    
},

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