Acme.BookStore.HttpApi.Host/node_modules/resolve/lib/async.js

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var core = require('./core');
var fs = require('fs');
var path = require('path');
var caller = require('./caller.js');
var nodeModulesPaths = require('./node-modules-paths.js');
var normalizeOptions = require('./normalize-options.js');

var defaultIsFile = function isFile(file, cb) {
    fs.stat(file, function (err, stat) {
        if (!err) {
            return cb(null, stat.isFile() || stat.isFIFO());
        }
        if (err.code === 'ENOENT' || err.code === 'ENOTDIR') return cb(null, false);
        return cb(err);
    });
};

var defaultIsDir = function isDirectory(dir, cb) {
    fs.stat(dir, function (err, stat) {
        if (!err) {
            return cb(null, stat.isDirectory());
        }
        if (err.code === 'ENOENT' || err.code === 'ENOTDIR') return cb(null, false);
        return cb(err);
    });
};

module.exports = function resolve(x, options, callback) {
    var cb = callback;
    var opts = options;
    if (typeof options === 'function') {
        cb = opts;
        opts = {};
    }
    if (typeof x !== 'string') {
        var err = new TypeError('Path must be a string.');
        return process.nextTick(function () {
            cb(err);
        });
    }

    opts = normalizeOptions(x, opts);

    var isFile = opts.isFile || defaultIsFile;
    var isDirectory = opts.isDirectory || defaultIsDir;
    var readFile = opts.readFile || fs.readFile;

    var extensions = opts.extensions || ['.js'];
    var basedir = opts.basedir || path.dirname(caller());
    var parent = opts.filename || basedir;

    opts.paths = opts.paths || [];

    // ensure that `basedir` is an absolute path at this point, resolving against the process' current working directory
    var absoluteStart = path.resolve(basedir);

    if (opts.preserveSymlinks === false) {
        fs.realpath(absoluteStart, function (realPathErr, realStart) {
            if (realPathErr && realPathErr.code !== 'ENOENT') cb(err);
            else init(realPathErr ? absoluteStart : realStart);