text: 'use strict';
  const path = require('path');
  const locatePath = require('locate-path');
  
  module.exports = (filename, opts) => {
  	opts = opts || {};
  
  	const startDir = path.resolve(opts.cwd || '');
  	const root = path.parse(startDir).root;
  
  	const filenames = [].concat(filename);
  
  	return new Promise(resolve => {
  		(function find(dir) {
  			locatePath(filenames, {cwd: dir}).then(file => {
  				if (file) {
  					resolve(path.join(dir, file));
  				} else if (dir === root) {
  					resolve(null);
  				} else {
  					find(path.dirname(dir));
  				}
  			});
  		})(startDir);
  	});
  };
  
  module.exports.sync = (filename, opts) => {
  	opts = opts || {};
  
  	let dir = path.resolve(opts.cwd || '');
  	const root = path.parse(dir).root;
  
  	const filenames = [].concat(filename);
  
  	// eslint-disable-next-line no-constant-condition
  	while (true) {
  		const file = locatePath.sync(filenames, {cwd: dir});
  
  		if (file) {
  			return path.join(dir, file);
  		} else if (dir === root) {
  			return null;
  		}
  
  		dir = path.dirname(dir);
  	}
  };
  