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if (typeof ServiceWorkerGlobalScope === "function") {
self.onmessage = function (e) { e.source.postMessage("ping"); };
} else if (typeof SharedWorkerGlobalScope === "function") {
onconnect = function (e) {
var port = e.ports[0];
port.onmessage = function () { port.postMessage("ping"); }
port.postMessage("ping");
};
} else if (typeof DedicatedWorkerGlobalScope === "function") {
self.postMessage("ping");
}