Edit - sync.js

Edit: sync.js

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');

module.exports = function (x, options) {
    if (typeof x !== 'string') {
        throw new TypeError('Path must be a string.');
    }
    var opts = normalizeOptions(x, options);

var isFile = opts.isFile || defaultIsFile;
    var readFileSync = opts.readFileSync || fs.readFileSync;

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) {
        try {
            absoluteStart = fs.realpathSync(absoluteStart);
        } catch (realPathErr) {
            if (realPathErr.code !== 'ENOENT') {
                throw realPathErr;
            }
        }
    }

if ((/^(?:\.\.?(?:\/|$)|\/|([A-Za-z]:)?[/\\])/).test(x)) {
        var res = path.resolve(absoluteStart, x);
        if (x === '..' || x.slice(-1) === '/') res += '/';
        var m = loadAsFileSync(res) || loadAsDirectorySync(res);
        if (m) return m;
    } else {
        var n = loadNodeModulesSync(x, absoluteStart);
        if (n) return n;
    }

if (core[x]) return x;

var err = new Error("Cannot find module '" + x + "' from '" + parent + "'");
    err.code = 'MODULE_NOT_FOUND';
    throw err;

function loadAsFileSync(x) {
        var pkg = loadpkg(path.dirname(x));

if (pkg && pkg.dir && pkg.pkg && opts.pathFilter) {
            var rfile = path.relative(pkg.dir, x);
            var r = opts.pathFilter(pkg.pkg, x, rfile);
            if (r) {
                x = path.resolve(pkg.dir, r); // eslint-disable-line no-param-reassign
            }
        }

if (isFile(x)) {
            return x;
        }

for (var i = 0; i < extensions.length; i++) {
            var file = x + extensions[i];
            if (isFile(file)) {
                return file;
            }
        }
    }

function loadpkg(dir) {
        if (dir === '' || dir === '/') return;
        if (process.platform === 'win32' && (/^\w:[/\\]*$/).test(dir)) {
            return;
        }
        if ((/[/\\]node_modules[/\\]*$/).test(dir)) return;

var pkgfile = path.join(dir, 'package.json');

if (!isFile(pkgfile)) {
            return loadpkg(path.dirname(dir));
        }

var body = readFileSync(pkgfile);

try {
            var pkg = JSON.parse(body);
        } catch (jsonErr) {}

if (pkg && opts.packageFilter) {
            pkg = opts.packageFilter(pkg, dir);
        }

return { pkg: pkg, dir: dir };
    }

function loadAsDirectorySync(x) {
        var pkgfile = path.join(x, '/package.json');
        if (isFile(pkgfile)) {
            try {
                var body = readFileSync(pkgfile, 'UTF8');
                var pkg = JSON.parse(body);
            } catch (e) {}

if (opts.packageFilter) {
                pkg = opts.packageFilter(pkg, x);
            }

if (pkg.main) {
                if (typeof pkg.main !== 'string') {
                    var mainError = new TypeError('package “' + pkg.name + '” `main` must be a string');
                    mainError.code = 'INVALID_PACKAGE_MAIN';
                    throw mainError;
                }
                if (pkg.main === '.' || pkg.main === './') {
                    pkg.main = 'index';
                }
                try {
                    var m = loadAsFileSync(path.resolve(x, pkg.main));
                    if (m) return m;
                    var n = loadAsDirectorySync(path.resolve(x, pkg.main));
                    if (n) return n;
                } catch (e) {}
            }
        }

return loadAsFileSync(path.join(x, '/index'));
    }

function loadNodeModulesSync(x, start) {
        var dirs = nodeModulesPaths(start, opts, x);
        for (var i = 0; i < dirs.length; i++) {
            var dir = dirs[i];
            var m = loadAsFileSync(path.join(dir, '/', x));
            if (m) return m;
            var n = loadAsDirectorySync(path.join(dir, '/', x));
            if (n) return n;
        }
    }
};

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