Added check to see if folder is a valid node module

index.js

@@ -68,6 +68,17 @@ module.exports = function requireDir(dir, opts) {
             }
 
             if (FS.statSync(path).isDirectory()) {
+
+                // If we're not recursing through the files then we check to see
+                // if the folder is a valid node module
+
+                // Checks to see if there is an index file and returns the extension
+                var modulePath = getModulePath(path);
+
+                if (modulePath && !opts.recurse) {
+                    filesMinusDirs[file + Path.extname(modulePath)] = modulePath;
+                }
+
                 if (opts.recurse) {
                     if (base === 'node_modules') {
                         continue;
@@ -100,6 +111,7 @@ module.exports = function requireDir(dir, opts) {
 
             // if a file exists with this extension, we'll require() it:
             var file = base + ext;
+
             var path = filesMinusDirs[file];
 
             if (path) {
@@ -134,6 +146,14 @@ module.exports = function requireDir(dir, opts) {
     return map;
 };
 
+function getModulePath(path) {
+    try {
+        return require.resolve(path);
+    } catch (_) {
+        return false;
+    }
+}
+
 function toCamelCase(str) {
     return str.replace(/[_-][a-z]/ig, function (s) {
         return s.substring(1).toUpperCase();

test/directoryAsModule.js

@@ -0,0 +1,8 @@
+var assert = require('assert');
+var requireDir = require('..');
+
+assert.deepEqual(requireDir('./directoryAsModule'), {
+    a: 'a', b: 'b'
+});
+
+console.log('Automatic Index tests passed')

test/directoryAsModule/a.js

@@ -0,0 +1 @@
+module.exports = 'a';

test/directoryAsModule/b/index.js

@@ -0,0 +1 @@
+module.exports = 'b'

test/directoryAsModule/c/hello.txt

@@ -0,0 +1 @@
+Not a module