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var port;
// Exercise the 'onmessage' handler:
self.onmessage = function(e) {
var message = e.data;
if ('port' in message) {
port = message.port;
}
};
// And an event listener:
self.addEventListener('message', function(e) {
var message = e.data;
if ('value' in message) {
port.postMessage('Acking value: ' + message.value);
} else if ('done' in message) {
port.postMessage('quit');
}
});