Solidity events on react not firing

Question

Simple logic event with firing in function, work perfectly as expected in truffle develop console, but never firing on my Dapp created with create-react-app, it's just seems to not listen/monitor the network, I've people saying it should continuously load POST request to monitor network, but not in my case. I use Metamask, and all smart-contract function calls works fine on react, except events.

event RoundStarted(uint256 closingBlock);

function roundStart() public ownerOnly {
    RoundStarted(block.number + ROUND_LENGTH);
}

And the line of code I used in truffle develop console, which is not working when I paste it in componentWillMount()

  Loto.deployed().then(function(instance){
    return instance.RoundStarted({},{fromBlock: 0, toBlock: 'latest'});
  }).then((result) => {
    return result.watch((error,result) => { 
      console.log('Found him!')
    })
  })

UPD: I found out that events works fine in truffle react box, so this kinda solves the problem, but I still don't know how did they manage it, it's not my code problem, something about dependencies, I'd like to know what do I miss in my create-react-app.

Answer 1

Does it work if you remove all of the JS object arguments in the contract event call, eg if you replace line 2 in your snippet with return instance.RoundStarted();

I haven't experimented with specifying start and end blocks that I want to monitor within but perhaps specifying the end block as 'latest' takes the latest block at the time your componentWillMount() function is called which is likely a block before your event is fired.