PWV-1: Refactoring ohif:studylist package

Packages/ohif-study-list/client/lib/getStudiesMetadata.js

@@ -1,3 +1,4 @@
+import { $ } from 'meteor/jquery';
 import { OHIF } from 'meteor/ohif:core';
 
 /**
@@ -10,7 +11,7 @@ import { OHIF } from 'meteor/ohif:core';
  * @param doneCallback The callback function to be executed when the study retrieval has finished
  * @param failCallback The callback function to be executed when the study retrieval has failed
  */
-getStudiesMetadata = function(studyInstanceUids, doneCallback, failCallback) {
+OHIF.studylist.getStudiesMetadata = (studyInstanceUids, doneCallback, failCallback) => {
     // Check to make sure studyInstanceUids were actually input
     if (!studyInstanceUids || !studyInstanceUids.length) {
         if (failCallback && typeof failCallback === 'function') {
@@ -22,13 +23,13 @@ getStudiesMetadata = function(studyInstanceUids, doneCallback, failCallback) {
 
     // Create an empty array to store the Promises for each metaData
     // retrieval call
-    var promises = [];
+    const promises = [];
 
     // Loop through the array of studyInstanceUids
     studyInstanceUids.forEach(function(studyInstanceUid) {
         // Create a new Deferred to monitor the progress of the asynchronous
         // metaData retrieval
-        var deferred = new $.Deferred();
+        const deferred = new $.Deferred();
 
         // Send the call, and attach doneCallbacks and failCallbacks
         // which can resolve or reject the related promise based on its outcome
@@ -45,7 +46,7 @@ getStudiesMetadata = function(studyInstanceUids, doneCallback, failCallback) {
     // When all of the promises are complete, this callback runs
     $.when.apply($, promises).done(function() {
         // Convert the Arguments Array-like Object to an actual array
-        var studies = $.makeArray(arguments);
+        const studies = $.makeArray(arguments);
 
         // Pass the studies array to the doneCallback, if one exists
         if (doneCallback && typeof doneCallback === 'function') {