Function normalizeOptionalColor

src/config/OptionResolver.ts:493–497

(color: unknown)

};

const normalizeOptionalColor = (color: unknown): string | undefined => {
  if (typeof color !== 'string') return undefined;
  const trimmed = color.trim();
  return trimmed.length > 0 ? trimmed : undefined;
};

const normalizeSampling = (value: unknown): SeriesSampling | undefined => {
  if (typeof value !== 'string') return undefined;