module.exports = function() {
    function hotDownloadManifest(requestTimeout) {
        requestTimeout = requestTimeout || 10000;
        return new Promise(function(resolve, reject) {
            if (typeof XMLHttpRequest === 'undefined') {
                return reject(new Error('No browser support'));
            }
            try {
                var request = new XMLHttpRequest();
                var requestPath = $require$.p + $hotMainFilename$;
                request.open('GET', requestPath, true);
                request.timeout = requestTimeout;
                request.send(null);
            } catch (err) {
                return reject(err);
            }
            request.onreadystatechange = function() {
                if (request.readyState !== 4) return;
                if (request.status === 0) {
                    // timeout
                    reject(new Error('Manifest request to ' + requestPath + ' timed out.'));
                } else if (request.status === 404) {
                    // no update available
                    resolve();
                } else if (request.status !== 200 && request.status !== 304) {
                    // other failure
                    reject(new Error('Manifest request to ' + requestPath + ' failed.'));
                } else {
                    // success
                    try {
                        var update = JSON.parse(request.responseText);
                    } catch (e) {
                        reject(e);
                        return;
                    }
                    resolve(update);
                }
            };
        });
    }
};