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denoland-deno/cli/tests/testdata/run/stdout_write_sync_async.ts

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const encoder = new TextEncoder();
const pending = [];
for (let i = 0; i < 100; i++) {
// some code that will cause stdout to be written
// synchronously while the async write might be occurring
console.log("Hello");
pending.push(Deno.stdout.write(encoder.encode("Hello\n")));
if (i % 10) {
await new Promise((resolve) => setTimeout(resolve, 0));
}
}
await Promise.all(pending);