Says a warning on the console once for each mounted chart, from an effect
rather than while rendering.
The chart remembers what it has said, so a re-render says nothing again,
and neither does React's development check that runs a new chart's effects
twice. A chart unmounted and mounted again is a new chart and says it
again. Nothing is kept outside the chart, so nothing outlives it.
Says a warning on the console once for each mounted chart, from an effect rather than while rendering.
The chart remembers what it has said, so a re-render says nothing again, and neither does React's development check that runs a new chart's effects twice. A chart unmounted and mounted again is a new chart and says it again. Nothing is kept outside the chart, so nothing outlives it.