Cleanup

node_modules/mongodb/lib/change_stream.js

@@ -169,7 +169,6 @@ class ChangeStream extends EventEmitter {
   /**
    * Is the change stream closed
    * @method ChangeStream.prototype.isClosed
-   * @param  {boolean} [checkCursor=true] also check if the underlying cursor is closed
    * @return {boolean}
    */
   isClosed() {
@@ -326,8 +325,8 @@ class ChangeStreamCursor extends Cursor {
 
   _initializeCursor(callback) {
     super._initializeCursor((err, result) => {
-      if (err) {
-        callback(err);
+      if (err || result == null) {
+        callback(err, result);
         return;
       }
 
@@ -438,7 +437,7 @@ function createChangeStreamCursor(self, options) {
 
   if (self.pipeDestinations) {
     const cursorStream = changeStreamCursor.stream(self.streamOptions);
-    for (let pipeDestination in self.pipeDestinations) {
+    for (let pipeDestination of self.pipeDestinations) {
       cursorStream.pipe(pipeDestination);
     }
   }
@@ -483,6 +482,11 @@ function waitForTopologyConnected(topology, options, callback) {
 function processNewChange(changeStream, change, callback) {
   const cursor = changeStream.cursor;
 
+  // a null change means the cursor has been notified, implicitly closing the change stream
+  if (change == null) {
+    changeStream.closed = true;
+  }
+
   if (changeStream.closed) {
     if (callback) callback(new MongoError('ChangeStream is closed'));
     return;