JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://canvasjs.com/assets/script/canvasjs.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jspdf/1.0.272/jspdf.min.js"></script>
<br/><!-- Just so that JSFiddle's Result label doesn't overlap the Chart -->

<div id="chartContainer" style="height: 360px; width: 100%;"></div>
<button id="exportButton" type="button">Export as PDF</button>

JavaScript

var chart = new CanvasJS.Chart("chartContainer",
{
		title: {
			text: "Exporting chart using jsPDF & toDataurl"
		},
    theme: "dark1",
		data: [
		{
			type: "spline",
			dataPoints: [ 
				{ x: 10, y: 4 }, 
				{ x: 20, y: 7 },
				{ x: 30, y: 2 },
				{ x: 40, y: 3 },
				{ x: 50, y: 5 }
			]
		}
		]
});
chart.render();

$("#exportButton").click(function(){
    var pdf = new jsPDF();
    var chartTheme = chart.get("theme");
		chart.set("theme", "light2");
		var canvas = $("#chartContainer .canvasjs-chart-canvas").get(0);
		var dataURL = canvas.toDataURL();
		chart.set("theme", chartTheme);
    pdf.addImage(dataURL, 'JPEG', 0, 0);
    pdf.save("download.pdf");
});