Function buildError

src/utils.ts:138–169

* Construct a JSON-serializable object given an error and a JSON-serializable `fallbackError` * * @param error - The error in question. * @param fallbackError - A JSON-serializable fallback error. * @param shouldPreserveMessage - Whether to preserve the error's message if the fallback * error i

(
  error: unknown,
  fallbackError: SerializedJsonRpcError,
  shouldPreserveMessage: boolean,
)

 * @returns A JSON-serializable error object.
 */
function buildError(
  error: unknown,
  fallbackError: SerializedJsonRpcError,
  shouldPreserveMessage: boolean,
): SerializedJsonRpcError {
  // If an error specifies a `serialize` function, we call it and return the result.
  if (
    error &&
    typeof error === 'object' &&
    'serialize' in error &&
    typeof error.serialize === 'function'
  ) {
    return error.serialize();
  }

  if (isJsonRpcError(error)) {
    return error;
  }

  const originalMessage = getOriginalMessage(error);

  // If the error does not match the JsonRpcError type, use the fallback error, but try to include the original error as `cause`.
  const cause = serializeCause(error);
  const fallbackWithCause = {
    ...fallbackError,
    ...(shouldPreserveMessage &&
      originalMessage && { message: originalMessage }),
    data: { cause },
  };

  return fallbackWithCause;
}

/**
 * Attempts to extract the original `message` property from an error value of uncertain shape.