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How to access the canvas context?

The canvas node and hence context can be accessed by placing a ref to the element as:

function App() {
const chartRef = useRef(null);

useEffect(() => {
const chart = chartRef.current;

if (chart) {
console.log('CanvasRenderingContext2D', chart.ctx);
console.log('HTMLCanvasElement', chart.canvas);
}, []);

return <Chart ref={chartRef} type='line' data={chartData} />;

See sandbox with working example.