Get a Promise on events fired

getEventsPromise.js

getEventsPromise= function (myFilter, count, timeOut) {
    timeOut = timeOut ? timeOut : 30000;
    var promise = new Promise(function (resolve, reject) {
        count = (typeof count !== "undefined") ? count : 1;
        var results = [];
        var toClear = setTimeout(function () {
            reject("Timed out");
        }, timeOut);
        myFilter.watch(function (error, result) {
            if (error) {
                clearTimeout(toClear);
                reject(error);
            } else {
                count--;
                results.push(result);
            }
            if (count <= 0) {
                resolve(results.map(value => value));
                clearTimeout(toClear);
                myFilter.stopWatching(() => {});
            }
        });
        if (count == 0) {
            promise = promise
                .then(function (events) {
                    throw "Expected to have no event";
                })
                .catch(function (error) {
                    if (error != "Timed out") {
                        throw error;
                    }
                });
        }
        return promise;
    });
};

Example of use:

getEventsPromise(myContract.LogRequest({}, { fromBlock: blockNumber }))
  .then(function (events) {
    console.log(events);
  });

If you want to make sure there is no event at a given block:

getEventsPromise(myContract.LogRequest({}, { fromBlock: blockNumber, toBlock: blockNumber }), 0, 1000)
  .then(function () {
    console.log("No event, as expected");
  })
  .catch(function(error) {
    console.error(error);
    console.error("There were events or another error");
  });