build/lib/util.ts/_rreaddir
function _rreaddir(dirPath: string, prepend: string, result: string[]): void {
	const entries = fs.readdirSync(dirPath, { withFileTypes: true });
	for (const entry of entries) {
		if (entry.isDirectory()) {
			_rreaddir(path.join(dirPath, entry.name), `${prepend}/${entry.name}`, result);
		} else {
			result.push(`${prepend}/${entry.name}`);
		}
	}
}