get external SD card ID

getExternalSDCardID.js

const execa = require("execa");
const to_json = require("xmljson").to_json;
const EXTERNAL_DIR  = "/Volumes"; // mac

function getExternalSDCardID(readyCallback, errorCallback) {
    const params = ["list", "-plist", "external", "physical"];

    // diskutil list -plist external physical
    execa("diskutil", [...params]).then(result => {
      to_json(result.stdout, (err, root) => {
        //console.log(JSON.stringify(root, null, 2));
        if (err) { console.error(err.message); errorCallback(err); return; }
        if (root.plist.dict.array["2"]) {
          readyCallback( root.plist.dict.array["2"].string );
        } else {
          errorCallback(new Error("SD_CARD NOT FOUND"));
        }
      });
    });
}