Edit: exists.js
'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)) }) }
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