capacitor barcode scan

If you npm install a Cordova/Capacitor plugin after npx cap add android then make sure you run npx cap update before running from Android Studio again.
If you make html, js, ts, css changes, run ionic build again and also run npx cap copy.
Or when in doubt, run npx cap sync as it does update+copy.

https://github.com/ionic-team/capacitor/issues/1213
https://stackoverflow.com/questions/23060038/cant-use-barcode-scanner-in-cordova-plugin-is-installed

1. init

npx @capacitor/cli create testbarcode
npx cap add android
npx cap sync
npx cap copy
npx cap open android

ctrl+c exit

2. npm i phonegap-plugin-barcodescanner

npm i phonegap-plugin-barcodescanner --save
npx cap sync
npx cap copy

3. modify www/index.html

ADD

<button onclick="myFunction2()">Try it barcode</button>

<script>
    async function myFunction2() {
      cordova.plugins.barcodeScanner.scan(
        result => console.log(result),
        err => console.error(err),
        {
          showTorchButton: true,
          prompt: "Scan your code",
          formats: "QR_CODE",
          resultDisplayDuration: 0
        }
      );
    }
</script>

npx cap sync
npx cap copy

android studio run

PS: use cordova.plugins NOT window.cordova.plugins