// import it
const JSADB = require("js-adb");

// start an instance
const instance = new JSADB();

// optionally you can specify a device name in case of multitasking..
// it is equivalent to the -s parameter on the ADB command line.
const deviceName = "emulator-5545";

// functions works asynchronously, so make sure to add "await" 
async function test() {
    await instance.screenshot("picture.png", deviceName);
    await instance.dumpWindowXML(deviceName);
    console.log(await instance.listOfInstalledApps());

    // don't know which devices are available? no need to worry no more..
    console.log(await instance.getDeviceList());
}

test();