method Deno.FsFile.prototype.setRaw

Set TTY to be under raw mode or not. In raw mode, characters are read and returned as is, without being processed. All special processing of characters by the terminal is disabled, including echoing input characters. Reading from a TTY device in raw mode is faster than reading from a TTY device in canonical mode.

using file = await Deno.open("/dev/tty6");
file.setRaw(true, { cbreak: true });