in src/errors/Errors.ts [172:177]
export function isRetryableException(e: AWSError, onCommit: boolean): boolean {
const canSdkRetry: boolean = onCommit ? false : e.retryable;
return isRetryableStatusCode(e) || isOccConflictException(e) || canSdkRetry ||
(isInvalidSessionException(e) && !isTransactionExpiredException(e));
}