Returns the currently active data points being displayed in the Tooltip. Active means that it is currently visible; this hook will return undefined if there is no current interaction.

This follows the <Tooltip /> props, if the Tooltip element is present in the chart. If there is no <Tooltip /> then this hook will follow the default Tooltip props.

Data point is whatever you pass as an input to the chart using the data= prop.

This returns an array because a chart can have multiple graphical items in it (multiple Lines for example) and tooltip with shared= will display all items at the same time.

Returns undefined when used outside a chart context.