itunes-bridge/jxa/iTunesFetcher.js

A macOS and Windows NodeJS package to control and get informations from iTunes and macOS Music app through AppleScript

const a = Application.currentApplication();
let iTunes;
a.includeStandardAdditions = true;

try{
    a.doShellScript("open -Ra Music");
    iTunes = Application('Music');
}catch{
    iTunes = Application('iTunes');
}

ObjC.import('Foundation');
const argv = $.NSProcessInfo.processInfo.arguments.js;

function getCurrentTrack() {
    const currentTrack = iTunes.currentTrack;
    try {
        const remainingTime = parseInt(currentTrack.duration() - iTunes.playerPosition());
        const json = {
            "name": currentTrack.name(),
            "artist": currentTrack.artist(),
            "album": currentTrack.album(),
            "mediaKind": currentTrack.mediaKind(),
            "duration": parseInt(currentTrack.duration()),
            "elapsedTime": parseInt(iTunes.playerPosition()),
            "remainingTime": remainingTime,
            "genre": currentTrack.genre(),
            "releaseYear": currentTrack.year(),
            "id": currentTrack.id(),
            "playerState": iTunes.playerState()
        };
        return json;
    } catch (e) {
        return {"playerState": "stopped"};
    }
}
function getSoundVolume() {
    return iTunes.soundVolume();
}
function run(argv) {
    switch(argv[0]){
        case "getCurrentTrack":{
            return JSON.stringify(getCurrentTrack());
            break;
        }
        case "getPlayerState":{
            try {
                return JSON.stringify(iTunes.playerState());
            }catch (e){
                return "stopped";
            }
            break;
        }
        case "getSoundVolume":{
            return getSoundVolume();
            break;
        }
    }
}