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denoland-deno/tests/testdata/run/before_unload.js

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let count = 0;
console.log("0");
globalThis.addEventListener("beforeunload", (e) => {
console.log("GOT EVENT");
if (count === 0 || count === 1) {
e.preventDefault();
setTimeout(() => {
console.log("3");
}, 100);
}
count++;
});
console.log("1");
setTimeout(() => {
console.log("2");
}, 100);