Lint fixes

lib/helpers.js

@@ -11,9 +11,9 @@ const ObjectID = require('mongodb').ObjectID;
 /**
  * Prepares metadata to store into database.
  * @param {*} meta Metadata
- * @return {*}
+ * @returns {*}
  */
-exports.prepareMetaData = meta=>{
+exports.prepareMetaData = meta => {
   return cloneMeta(meta);
 };
 
@@ -35,18 +35,18 @@ function cloneMeta(node, opt_parents) {
     return new Date(node.getTime());
   } else if (node instanceof Error) {
     // This is needed because Error's message, name and stack isn't accessible when cycling through properties
-    copy = {message: node.message, name: node.name, stack: node.stack};
+    copy = { message: node.message, name: node.name, stack: node.stack };
   }
   opt_parents = opt_parents || [];
   opt_parents.push(node);
-  for (let key in node) {
+  for (const key in node) {
     if (!Object.prototype.hasOwnProperty.call(node, key)) {
       continue;
     }
-    let value = node[key];
+    const value = node[key];
     let newKey = key;
     if (newKey.includes('.') || newKey.includes('$')) {
-        newKey = newKey.replace(/\./g, '[dot]').replace(/\$/g, '[$]');
+      newKey = newKey.replace(/\./g, '[dot]').replace(/\$/g, '[$]');
     }
     if (value instanceof Object) {
       if (opt_parents.indexOf(value) === -1) {