joplin/ReactNativeClient/lib/joplin-renderer/pathUtils.js

function dirname(path) {
	if (!path) throw new Error('Path is empty');
	const s = path.split(/\/|\\/);
	s.pop();
	return s.join('/');
}

function basename(path) {
	if (!path) throw new Error('Path is empty');
	const s = path.split(/\/|\\/);
	return s[s.length - 1];
}

function filename(path, includeDir = false) {
	if (!path) throw new Error('Path is empty');
	let output = includeDir ? path : basename(path);
	if (output.indexOf('.') < 0) return output;

	output = output.split('.');
	output.pop();
	return output.join('.');
}

function fileExtension(path) {
	if (!path) throw new Error('Path is empty');

	const output = path.split('.');
	if (output.length <= 1) return '';
	return output[output.length - 1];
}

module.exports = { basename, dirname, filename, fileExtension };