https://github.com/ruby/reline/blob/a41618/lib/reline.rb#L417

ambiguous_char_width.ts

process.stdout.write('\x1b[?25l' + '\x1b[30;40m' + '▽' + '\x1b[0m');

process.stdin.setRawMode(true);
process.stdout.setNoDelay(true);
process.stdout.write('\x1B[6n');
const rowcol = await new Promise(r => {
  let buf = '';
  const onData = (data: Buffer) => {
    buf += data.toString('utf8');
    const match = /\x1B\[(\d+);(\d+)R/.exec(buf);
    if (match) {
      process.stdin.off('data', onData);
      r([Number(match[1]) - 1, Number(match[2]) - 1]);
    }
  };
  process.stdin.on('data', onData);
})
process.stdin.setRawMode(false);
process.stdout.write('\x1B[2K\r' + '\x1b[?25h');
process.stdout.setNoDelay(false);
process.stdin.pause();

console.log(rowcol);