Function takeString

src/config/OptionResolver.ts:468–473

(key: keyof ThemeConfig)

  const input = themeInput as Partial<Record<keyof ThemeConfig, unknown>>;
  const takeString = (key: keyof ThemeConfig): string | undefined => {
    const v = input[key];
    if (typeof v !== 'string') return undefined;
    const trimmed = v.trim();
    return trimmed.length > 0 ? trimmed : undefined;
  };

  const fontSizeRaw = input.fontSize;
  const fontSize =