Trouble using web3.getBalance() and similar functions

[AusIV]

Apologies for posting this as an issue, as I suspect it's my own misunderstanding rather than anything actually wrong with provider-engine.

If I do:

var engine = ZeroClientProvider({
  getAccounts: function(){},
  rpcUrl: 'https://mainnet.infura.io/',
})
var web3 = new Web3(engine)
web3.eth.getBalance(someAddress, function(err, resp){
  console.log(err);
  console.log(resp);
});

I would expect it to either log an error from getBalance, or log the balance at someAddress. Instead, I get an error:

Web3ProviderEngine does not support synchronous requests.
  at Web3ProviderEngine.send (index.js:71)
  at RequestManager.send (index.js:74)
  at sendRequest (index.js:519)
  at Eth.send [as getBalance] (index.js:534)

I get similar results for anything that would have to go to the RPC server for a result. My understanding was that if I specified a callback function as the last argument to web3.eth.getBalance() it would run the request asynchronously and make a callback. This works if I use the straight HttpProvider for web3.

Where am I going wrong?

[AusIV]

It looks like my problem was that I had accidentally installed the web3 1.0.0-beta.13 version, and it looks like there are some breaking changes in 1.0.0. This may be something provider-engine will need to fix eventually to be compatible with 1.0.0, but that's another issue.