Optional engineEngine configuration
Optional feedbackFeedback configuration
Optional frameFrame source configuration
Optional locatorLocator configuration
Optional modeMode: can be 'immediate' (default) for always-on scanning, and 'touch', to only scan when a touch occurs.
immediate
Optional overlayOverlay configuration
CSS Selector or reference to the HTML element that will host the visible elements of the BarcodeReader.
When using a selector, make sure the selector only matches a single element, e.g. by using an ID. When using the popup scanner, do not pass a selector.
BarcodeReader configuration object.