JAVASCRIPT

react native controlling device brightness

npm i @adrianso/react-native-device-brightness

//write code as following 
import DeviceBrightness from 'react-native-device-brightness';

// Setting brightness
DeviceBrightness.setBrightnessLevel(brightness);

// Getting brightness
const brightness = await DeviceBrightness.getBrightnessLevel();
console.log(brightness);

// Getting system brightness (Android only)
const brightness = await DeviceBrightness.getSystemBrightnessLevel();
console.log(brightness);

React native screen brightness

// yarn add react-native-screen-brightness

import ScreenBrightness from 'react-native-screen-brightness'; 
ScreenBrightness.setBrightness(0.5); // between 0 and 1
ScreenBrightness.getBrightness().then(brightness => {
	console.log('brightness', brightness);
});