async function scan()

in src/bluetooth/Bluetooth.tsx [181:221]
36 lines of code
7 McCabe index (conditional complexity)

    async function scan() {
      if (!shouldScan) {
        return;
      }

      if (Platform.OS === 'android') {
        const granted = await PermissionsAndroid.request(
          PermissionsAndroid.PERMISSIONS.ACCESS_FINE_LOCATION,
          {
            title: 'Bluetooth Permission',
            message:
              'Application would like to use bluetooth and location permissions',
            buttonNeutral: 'Ask Me Later',
            buttonNegative: 'Cancel',
            buttonPositive: 'OK',
          },
        );
        if (granted !== PermissionsAndroid.RESULTS.GRANTED) {
          throw new Error('Permission rejected');
        }
      }

      const sub = bleManager.onStateChange(s => {
        if (s === State.PoweredOn) {
          sub.remove();

          bleManager.startDeviceScan(null, {scanMode: 2}, (e, device) => {
            if (e) {
              console.error(e);
            }

            if (!device?.name) {
              return;
            }

            deviceMap.current?.set(device.id, device);
            setDevices(Array.from(deviceMap.current?.values() ?? []));
          });
        }
      }, true);
    }