How to use the react-native-ble-manager.getDiscoveredPeripherals function in react-native-ble-manager

return new Promise( (resolve, reject) =>{
            BleManager.getDiscoveredPeripherals([])
                .then((peripheralsArray) => {
                    console.log('Discovered peripherals: ', peripheralsArray);
                    resolve(peripheralsArray);
                });
        });
    }

return new Promise( (resolve, reject) =>{
            BleManager.getDiscoveredPeripherals([])
                .then((peripheralsArray) => {
                    console.log('Discovered peripherals: ', peripheralsArray);
                    resolve(peripheralsArray);
                })
                .catch(error=>{

                });
        });
    }