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function Deno.fdatasyncSync

Synchronously flushes any pending data operations of the given file stream to disk.

const file = Deno.openSync(
 { read: true, write: true, create: true },
Deno.writeSync(file.rid, new TextEncoder().encode("Hello World"));
console.log(new TextDecoder().decode(Deno.readFileSync("my_file.txt"))); // Hello World


rid: number