Function parseOpts

src/errors.ts:284–301

* Get an error message and optional data from an options bag. * * @param arg - The error message or options bag. * @returns A tuple containing the error message and optional data.

(
  arg?: JsonRpcErrorsArg<Data>,
)

 * @returns A tuple containing the error message and optional data.
 */
function parseOpts<Data extends OptionalDataWithOptionalCause>(
  arg?: JsonRpcErrorsArg<Data>,
): [message?: string | undefined, data?: Data | undefined] {
  if (arg) {
    if (typeof arg === 'string') {
      return [arg];
    } else if (typeof arg === 'object' && !Array.isArray(arg)) {
      const { message, data } = arg;

      if (message && typeof message !== 'string') {
        throw new Error('Must specify string message.');
      }
      return [message ?? undefined, data];
    }
  }

  return [];
}