Rocket.Chat.ReactNative/app/containers/markdown/Emoji.tsx

import React from 'react';
import { Text } from 'react-native';

import shortnameToUnicode from '../../lib/methods/helpers/shortnameToUnicode';
import CustomEmoji from '../EmojiPicker/CustomEmoji';
import styles from './styles';
import { useTheme } from '../../theme';

interface IEmoji {
	literal: string;
	isMessageContainsOnlyEmoji: boolean;
	getCustomEmoji?: Function;
	customEmojis?: any;
	style?: object;
	onEmojiSelected?: Function;
	tabEmojiStyle?: object;
}

const Emoji = React.memo(({ literal, isMessageContainsOnlyEmoji, getCustomEmoji, customEmojis = true, style = {} }: IEmoji) => {
	const { colors } = useTheme();
	const emojiUnicode = shortnameToUnicode(literal);
	const emoji: any = getCustomEmoji && getCustomEmoji(literal.replace(/:/g, ''));
	if (emoji && customEmojis) {
		return <CustomEmoji style={[isMessageContainsOnlyEmoji ? styles.customEmojiBig : styles.customEmoji]} emoji={emoji} />;
	}
	return (
		<Text style={[{ color: colors.fontDefault }, isMessageContainsOnlyEmoji ? styles.textBig : styles.text, style]}>
			{emojiUnicode}
		</Text>
	);
});

export default Emoji;