exists.js
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			'use strict'
			var fs = require('fs')
			var inflight = require('inflight')
			var accessError = require('./access-error.js')
			var isFsAccessAvailable = require('./is-fs-access-available.js')

			if (isFsAccessAvailable) {
			module.exports = fsAccessImplementation
			} else {
			module.exports = fsStatImplementation
			}

			// exposed only for testing purposes
			module.exports.fsAccessImplementation = fsAccessImplementation
			module.exports.fsStatImplementation = fsStatImplementation

			function fsAccessImplementation (dir, done) {
			done = inflight('exists:' + dir, done)
			if (!done) return
			fs.access(dir, fs.F_OK, done)
			}

			function fsStatImplementation (dir, done) {
			done = inflight('exists:' + dir, done)
			if (!done) return
			fs.stat(dir, function (er) { done(accessError(dir, er)) })
			}

shrine-medco/apps/steward-app/node/node_modules/npm/lib/install/exists.js63198c668de0master