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Can't make it work

Hi, I'm trying to create a node util to find some apps by name, and get an object with name,path,icon
I already got the part to get the apps, and now I want to convert the icns to base64 but string is always empty and no error..
this is what I have on a simple test.js

const { parseIcnsToBase64, parseIcnsToBase64Sync } = require('electron-icns-ex');

const getAppInfo = (path) => {
  const name = path.match(/([\w\d\s_-]*)\.?[^\\\/]*$/)[1];
  const icnsFile = getCFBundleIconFileSync(path);
  const icnsPath = `${path.replaceAll(' ', '\\ ')}/Contents/Resources/${icnsFile}`;
  const icon = parseIcnsToBase64Sync(icnsPath);

  return {
    name,
    path,
    icon 
  }
}

const getCFBundleIconFileSync = (appPath) => {
    const plistPath = `${appPath.replaceAll(' ', '\\ ')}/Contents/Info.plist`;
    const getIconFilenameCmd = `plutil -convert xml1 -o - ${plistPath} | sed -n '/CFBundleIconFile/,/\\//p' | sed -n '/<string>/,/<\\/string>/p' | sed 's/string>/\/g' | sed 's/<//g' | sed 's/\\///g' | awk '{$1=$1};1'`;
    return execSync(getIconFilenameCmd).toString();
}

Do I have to do anything else besides install the package with npm?

pngPath is not defined

Could you help me to figure out what am I missing?

    const icns = require('electron-icns-ex');
    parseIcnsToPNG(localIconPath, pngPath);                         // localIconPath defined erlier in the code
    const img = document.querySelector("#localIcon");
    img.src = pngPath;

error:
pngPath is not defined

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