TooTallNate/mouse.js

// Tested on Node.js 20+, should also work on 18.x though
process.stdin.resume();
process.stdin.setRawMode(true);
process.stdout.write('\x1B[?1006h'); // Enable SGR mouse mode
process.stdout.write('\x1B[?1003h'); // Enable any event mouse mode
// 1000 -> only listen to button press and release
// 1002 -> listen to button press and release + mouse motion only while pressing button
// 1003 -> listen to button press and release + mouse motion at all times
process.on('exit', () => {
    // disable all the modes
    process.stdout.write('\x1B[?1006l');
    process.stdout.write('\x1B[?1003l');
});
process.stdin.on('data', (buf) => {
    const seq = buf.toString('utf8');
    if (seq === '\u0003') {
        console.error('Ctrl+C');
        return process.stdin.pause();
    }
    if (!seq.startsWith('\x1B[<')) return; // not a mouse event
    const [btn, x, y] = seq.slice(3, -1).split(';').map(Number);
    const event = {};
    event.button = btn & 0b11000011;
    event.state = seq.at(-1) === 'M' ? 'pressed' : 'released';
    event.x = x;
    event.y = y;
    event.motion = !!(btn & 0b00100000);
    event.shift = !!(btn & 0b00000100);
    event.meta = !!(btn & 0b00001000);
    event.ctrl = !!(btn & 0b00010000);
    console.log(event);
});