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var syncport = null;
self.addEventListener('message', function(e) {
if ('port' in e.data) {
if (syncport) {
syncport(e.data.port);
} else {
syncport = e.data.port;
}
}
});
function sync() {
return new Promise(function(resolve) {
if (syncport) {
resolve(syncport);
} else {
syncport = resolve;
}
}).then(function(port) {
port.postMessage('SYNC');
return new Promise(function(resolve) {
port.onmessage = function(e) {
if (e.data === 'ACK') {
resolve();
}
}
});
});
}
self.addEventListener('fetch', function(event) {
// In Firefox the result would depend on a race between fetch handling
// and exception handling code. On the assumption that this might be a common
// design error, we explicitly allow the exception to be handled first.
event.respondWith(sync().then(() => new Response('intercepted')));
throw("error");
});