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/* Any copyright is dedicated to the Public Domain.
onmessage = function (pingEvt) {
if (pingEvt.data == "ping") {
let { port1, port2 } = new MessageChannel();
port2.onmessage = helloEvt => {
if (helloEvt.data == "hello") {
helloEvt.ports[0].postMessage("goodbye");
}
};
pingEvt.ports[0].postMessage("pong", [port1]);
}
};