How to change the border radius of days?

[ZiedChekir]

How to change the border radius of the rectangles representing days?

[felixmosh]

Pass a additionalRectAttrs which will return {strokeWidth: '1px', stroke: '#000'}

[ChaparroAlberto]

Brother, this way I was able to solve it 💪:

This is the example of the documentation

<CalendarHeatmap
  values={[
    { date: '2016-01-01', count: 1 },
    { date: '2016-01-03', count: 4 },
    { date: '2016-01-06', count: 2 },
    // ...and so on
  ]}

// Just add this, the RX and RY in tooltipDataAttrs //
  tooltipDataAttrs={() => {
    return { rx: "4", ry: "4" };
  }}
/>