"small" code refactor

extra_modules/ensureExists.js

@@ -0,0 +1,29 @@
+import {mkdir} from "fs"
+
+/**
+ * makes sure that a given folder exists, if it doesn't it creates one for you
+ * @param  {string}         path                the path of the folder
+ * @param  {permission}     mask                permission mask for the new folder to have
+ * @param  {Function}       cb                  callback, gives null if the folder exists, otherwise gives the error
+ * @return {undefined}                          see: callback
+ */
+ function ensureExists(path, mask, cb) {
+    if (typeof mask == 'function') { // Allow the `mask` parameter to be optional
+        cb = mask;
+        mask = 0o744;
+    }
+    mkdir(path, mask, function (err) {
+        if (err) {
+            if (err.code == 'EEXIST')
+                cb(null); // Ignore the error if the folder already exists
+            else
+                cb(err); // Something else went wrong
+        }
+        else
+            cb(null); // Successfully created folder
+    });
+}
+
+export {
+    ensureExists
+} ;