@mui/x-charts/modern/LineChart/extremums.js

The community edition of the charts components (MUI X).

export const getExtremumX = params => {
  const {
    axis
  } = params;
  const minX = Math.min(...(axis.data ?? []));
  const maxX = Math.max(...(axis.data ?? []));
  return [minX, maxX];
};
function getSeriesExtremums(getValues, stackedData) {
  if (stackedData.length === 0) {
    return [null, null];
  }
  return stackedData.reduce((seriesAcc, stackedValue) => {
    const [base, value] = getValues(stackedValue);
    if (seriesAcc[0] === null) {
      return [Math.min(base, value), Math.max(base, value)];
    }
    return [Math.min(base, value, seriesAcc[0]), Math.max(base, value, seriesAcc[1])];
  }, getValues(stackedData[0]));
}
export const getExtremumY = params => {
  const {
    series,
    axis,
    isDefaultAxis
  } = params;
  return Object.keys(series).filter(seriesId => series[seriesId].yAxisKey === axis.id || isDefaultAxis && series[seriesId].yAxisKey === undefined).reduce((acc, seriesId) => {
    const {
      area,
      stackedData
    } = series[seriesId];
    const isArea = area !== undefined;
    const getValues = isArea ? d => d : d => [d[1], d[1]]; // Since this series is not used to display an area, we do not consider the base (the d[0]).

    const seriesExtremums = getSeriesExtremums(getValues, stackedData);
    if (acc[0] === null) {
      return seriesExtremums;
    }
    if (seriesExtremums[0] === null) {
      return acc;
    }
    const [seriesMin, seriesMax] = seriesExtremums;
    return [Math.min(seriesMin, acc[0]), Math.max(seriesMax, acc[1])];
  }, [null, null]);
};