import { Deno } from "https://deno.land/x/levo@v0.0.27/templates/new-project/lib/lib.deno_runtime.d.ts";
const { truncateSync } = Deno;
Synchronously truncates or extends the specified file, to reach the
specified len. If len is not specified then the entire file contents
are truncated.
// truncate the entire file
Deno.truncateSync("my_file.txt");
// truncate part of the file
const file = Deno.makeTempFileSync();
Deno.writeFileSync(file, new TextEncoder().encode("Hello World"));
Deno.truncateSync(file, 7);
const data = Deno.readFileSync(file);
console.log(new TextDecoder().decode(data));
Requires allow-write permission.