index.mjs
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	import { dirname, resolve } from 'path';
	import { readdir, stat } from 'fs';
	import { promisify } from 'util';

	const toStats = promisify(stat);
	const toRead = promisify(readdir);

	export default async function (start, callback) {
	let dir = resolve('.', start);
	let tmp, stats = await toStats(dir);

	if (!stats.isDirectory()) {
	dir = dirname(dir);
	}

	while (true) {
	tmp = await callback(dir, await toRead(dir));
	if (tmp) return resolve(dir, tmp);
	dir = dirname(tmp = dir);
	if (tmp === dir) break;
	}
	}