'Barcode scanner on browser is not showing camera but Enter barcode value (empty value will fire the error handler)

I am using following library for barcode scanner

https://ionicframework.com/docs/native/barcode-scanner

$ ionic cordova plugin add phonegap-plugin-barcodescanner 
$ npm install @awesome-cordova-plugins/barcode-scanner

Run ionic application on browser using this cmd :

ionic cordova run browser

code for scan is below:

scanCode() {
    this.barcodeScanner.scan().then(barcodeData => {
      this.scannedData = barcodeData.text;
    }).catch(err => {
      console.log('Error', err);
    });
  }

There are two issues using the browser :

In the case below command, it is showing below error.

ionic serve

error on console.log :

common.js:350 Native: tried calling BarcodeScanner.scan, but Cordova is not available. Make sure to include cordova.js or run in a device/simulator

Error cordova_not_available

cordova.js is already in www/index.html

then I decided to run on browser with Cordova plugin

ionic cordova run browser

Scanner button below showing msg

I need camera not message like this... For android and iOS platform .. It is working well but if I run application for browser it is not showing camera. Any suggestion??

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'Barcode scanner on browser is not showing camera but Enter barcode value (empty value will fire the error handler)

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