Function formatPercentChange

src/components/formatTooltip.ts:65–74

(open: number, close: number)

}

function formatPercentChange(open: number, close: number): string {
  if (!Number.isFinite(open) || !Number.isFinite(close)) return EM_DASH;
  if (open === 0) return EM_DASH; // Avoid division by zero

  const change = ((close - open) / open) * 100;
  if (!Number.isFinite(change)) return EM_DASH;

  const sign = change > 0 ? '+' : '';
  return `${sign}${change.toFixed(2)}%`;
}

function formatRowHtml(params: TooltipParams, valueText: string): string {
  const safeName = escapeHtml(resolveSeriesName(params));