joplin/packages/app-mobile/components/Icon.tsx

import * as React from 'react';
import { TextStyle } from 'react-native';
const FontAwesomeIcon = require('react-native-vector-icons/FontAwesome5').default;

interface Props {
	name: string;
	style: TextStyle;

	// If `null` is given, the content must be labeled elsewhere.
	accessibilityLabel: string|null;
}

const Icon: React.FC<Props> = props => {
	// Matches:
	//  1. A prefix of word characters (\w+)
	//  2. A suffix of non-spaces (\S+)
	// An "fa-" at the beginning of the suffix is ignored.
	const nameMatch = props.name.match(/^(\w+)\s+(?:fa-)?(\S+)$/);

	const namePrefix = nameMatch ? nameMatch[1] : '';
	const nameSuffix = nameMatch ? nameMatch[2] : props.name;

	// If there's no label, make sure that the screen reader doesn't try
	// to read the characters from the icon font (they don't make sense
	// without the icon font applied).
	const accessibilityHidden = props.accessibilityLabel === null;

	return (
		<FontAwesomeIcon
			brand={namePrefix.startsWith('fab')}
			solid={namePrefix.startsWith('fas')}
			accessibilityLabel={props.accessibilityLabel}
			aria-hidden={accessibilityHidden}
			importantForAccessibility={
				accessibilityHidden ? 'no-hide-descendants' : 'yes'
			}
			name={nameSuffix}
			style={props.style}
		/>
	);
};

export default Icon;