The provided withTransaction and withSession helpers make running transactions very simple, but it's difficult to get the results of the operation back.

Both functions take a lambda as an argument that must return a Promise, but the functions don't pass through the value that the promise resolves to. This means that I need to create a wrapper function like this in order to get the return value:

runTransaction(writeFunc) {

	let writeResults = null;

	const txnFunc = session => (

		writeFunc(session)
			.then((results) => { writeResults = results; })
	);

	return this.client.withSession(session => session.withTransaction(txnFunc)))
		.then(() => {

			return writeResults;
		});
}

It's not the end of the world, but it would be nice if these functions could just pass through the results.