@otterscan/react-qr-reader/dist-src/QrReader/utils.js

A React Component for reading QR codes from the webcam

export const isMediaDevicesSupported = () => {
  const isMediaDevicesSupported = typeof navigator !== 'undefined' && !!navigator.mediaDevices;

  if (!isMediaDevicesSupported) {
    console.warn(`[ReactQrReader]: MediaDevices API has no support for your browser. You can fix this by running "npm i webrtc-adapter"`);
  }

  return isMediaDevicesSupported;
};
export const isValidType = (value, name, type) => {
  const isValid = typeof value === type;

  if (!isValid) {
    console.warn(`[ReactQrReader]: Expected "${name}" to be a of type "${type}".`);
  }

  return isValid;
};