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Deno.FsFile.prototype.syncSync - Deno documentation
method Deno.FsFile.prototype.syncSync
FsFile.prototype.syncSync(): void

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

const file = Deno.openSync(
  "my_file.txt",
  { read: true, write: true, create: true },
);
file.writeSync(new TextEncoder().encode("Hello World"));
file.truncateSync(1);
file.syncSync();
console.log(Deno.readTextFileSync("my_file.txt")); // H

Return Type

void