modern-react-qr-reader/src/worker.js

A react component for reading QR codes from the webcam. This is a modernized version of the JodusNodus package

// jsQR is concatenated by gulp

self.addEventListener('message', function(e) {
  var decoded = jsQR(
    e.data.data,
    e.data.width,
    e.data.height
  )
  if (decoded) {
    postMessage(decoded.data)
  } else {
    postMessage(null)
  }
})