1  const { dirname, resolve } = require('path');
 2  const { readdirSync, statSync } = require('fs');
 3  
 4  module.exports = function (start, callback) {
 5  	let dir = resolve('.', start);
 6  	let tmp, stats = statSync(dir);
 7  
 8  	if (!stats.isDirectory()) {
 9  		dir = dirname(dir);
10  	}
11  
12  	while (true) {
13  		tmp = callback(dir, readdirSync(dir));
14  		if (tmp) return resolve(dir, tmp);
15  		dir = dirname(tmp = dir);
16  		if (tmp === dir) break;
17  	}
18  }