export const formatDate:()

in packages/eui/src/services/format/format_date.ts [80:123]

• 35 lines of code
• 11 McCabe index (conditional complexity)

export const formatDate: (
  value?: moment.MomentInput,
  dateFormatKeyOrConfig?: DateFormat | string | Partial<FormatDateConfig>
) => string = (value, dateFormatKeyOrConfig = 'dateTime') => {
  if (isString(dateFormatKeyOrConfig)) {
    if (isNil(value)) {
      return '';
    }

    const dateFormatStrOrFunc = isStringADateFormat(dateFormatKeyOrConfig)
      ? dateFormatAliases[dateFormatKeyOrConfig]
      : dateFormatKeyOrConfig;

    if (isFunction(dateFormatStrOrFunc)) {
      return dateFormatStrOrFunc(value, {});
    }

    if (isString(dateFormatStrOrFunc)) {
      return moment(value).format(dateFormatStrOrFunc);
    }
  }

  if (instanceOfFormatDateConfig(dateFormatKeyOrConfig)) {
    const { format = 'dateTime', nil = '', options } = dateFormatKeyOrConfig;

    const dateFormat = dateFormatAliases[format] || format;

    if (isNil(value)) {
      return nil;
    }

    if (isFunction(dateFormat)) {
      return dateFormat(value, options);
    }

    if (isString(dateFormat)) {
      return moment(value).format(dateFormat);
    }
  }

  throw new Error(
    `Failed to format value using dateFormatKeyOrConfig: ${dateFormatKeyOrConfig}`
  );
};