Change dynamically from line to bar graph in Chart.js

Let's assume that you have the following line graph:

javascript
var graph = {
    type: 'line',
    data: {
    labels: ['mon', 'tue', 'wed', 'thu', 'fri', 'sat', 'sun'],
    datasets: [{
        label: 'users',
        borderColor: '#48ac98',
        borderWidth: 4,
        backgroundColor: 'rgba(72, 172, 152, 1)',
        borderRadius: 10,
        pointRadius: 0,
        data: ['24', '23', '26', '27', '23', '28', '22']
    }]
    },
    options: {
        responsive: true
    }
}

let canvas = document.getElementById('graph');
let ctx = canvas.getContext('2d');
let chart = new Chart(ctx, graph);

If you want to change from a line to a bar graph dynamically, you can use chart.update():

javascript
var changeToBar = () => {

    graph.type = (graph.type === 'line') ? 'bar' : 'line';

    chart.update();

}

Here is the HTML:

html
<button onclick = 'changeToBar()'>Change graph</button>
<canvas id = 'graph'>