Rocket.Chat.ReactNative/app/lib/methods/helpers/layoutAnimation.ts

import { LayoutAnimation } from 'react-native';

import { debounce } from '.';
import { isIOS } from './deviceInfo';

export const animateNextTransition = debounce(
	() => {
		if (isIOS) {
			LayoutAnimation.configureNext({
				duration: 200,
				create: {
					type: LayoutAnimation.Types.easeInEaseOut,
					property: LayoutAnimation.Properties.opacity
				},
				update: {
					type: LayoutAnimation.Types.easeInEaseOut
				},
				delete: {
					type: LayoutAnimation.Types.easeInEaseOut,
					property: LayoutAnimation.Properties.opacity
				}
			});
		}
	},
	200,
	true
);