Solution to File Searcher

var search = async (dir, token) => {
	let data = await readFiles(dir);
	let obj = {};
	// filter out lines 
	data.forEach((val)=>{
		let [directory, content]= val;
		let lines = [];
		content.split('\n').forEach((x, i)=>{
			if(x.match(token)) lines.push(i); // add lines
		})
		if(lines.length !== 0) obj[directory] = lines;
	});
	return obj;
}
var test = async () => {
	await populate_directory(); // initialise custom directories in background
	var names = await search('dir', 'World'); // wait for async function
	console.log(names); // print output of promise
}
test();