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denoland-deno/cli/tests/testdata/workers/event_worker_scope.js

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let messageHandlersCalled = 0;
let errorHandlersCalled = 0;
onmessage = function (e) {
if (e.data === "boom") {
throw new Error("boom error!");
}
messageHandlersCalled++;
};
self.addEventListener("message", (_e) => {
messageHandlersCalled++;
});
self.addEventListener("message", (_e) => {
messageHandlersCalled++;
});
self.addEventListener("message", (_e) => {
messageHandlersCalled++;
postMessage({
messageHandlersCalled,
errorHandlersCalled,
});
});
onerror = function (_e) {
errorHandlersCalled++;
};
self.addEventListener("error", (_e) => {
errorHandlersCalled++;
});
self.addEventListener("error", (_e) => {
errorHandlersCalled++;
});
self.addEventListener("error", (e) => {
errorHandlersCalled++;
e.preventDefault();
});