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let ports = 0;
self.onconnect = e => {
++ports;
e.ports[0].onmessage = event => {
if (event.data === "count") {
e.ports[0].postMessage(ports);
return;
}
if (event.data === "close") {
self.close();
return;
}
// Error.
e.ports[0].postMessage(-1);
};
};