JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://rawgithub.com/serratus/quaggaJS/441534cd8ba2ff15e4231ed41e77b10d5b3cc9ee/dist/quagga.min.js"></script>
<p>Barcode: <span class="found"></span></p>
<div id="interactive" class="viewport"></div>

JavaScript

Quagga.init({
    inputStream: {
        name: "Live",
        type: "LiveStream",
        constraints: {
            width: 640,
            height: 480,
            facing: "environment"
        }
    },
    locator: {
        patchSize: "medium",
        halfSample: true
    },
    numOfWorkers: 4,
    locate: true,
    decoder : {
        readers: ["code_128_reader", "ean_reader"]
    }
}, function() {
    Quagga.start();
});

Quagga.onDetected(function(result) {
    var code = result.codeResult.code;
    document.querySelector(".found").innerHTML = code;
});