react-native-vision-camera/package/src/hooks/useCameraDevices.ts

import { useEffect, useState } from 'react'
import type { CameraDevice } from '../CameraDevice'
import { CameraDevices } from '../CameraDevices'

/**
 * Get all available Camera Devices this phone has.
 *
 * Camera Devices attached to this phone (`back` or `front`) are always available,
 * while `external` devices might be plugged in or out at any point,
 * so the result of this function might update over time.
 */
export function useCameraDevices(): CameraDevice[] {
  const [devices, setDevices] = useState(() => CameraDevices.getAvailableCameraDevices())

  useEffect(() => {
    const listener = CameraDevices.addCameraDevicesChangedListener((newDevices) => {
      setDevices(newDevices)
    })
    return () => listener.remove()
  }, [])

  return devices
}