Minetrack/assets/js/plugins.js

export function uPlotTooltipPlugin(onHover) {
  let element;

  return {
    hooks: {
      init: (u) => {
        element = u.root.querySelector(".over");

        element.onmouseenter = () => onHover();
        element.onmouseleave = () => onHover();
      },
      setCursor: (u) => {
        const { left, top, idx } = u.cursor;

        if (idx === null) {
          onHover();
        } else {
          const bounds = element.getBoundingClientRect();

          onHover(
            {
              left: bounds.left + left + window.pageXOffset,
              top: bounds.top + top + window.pageYOffset,
            },
            idx
          );
        }
      },
    },
  };
}