Add docChanges snippet

Change-Id: Ie28db03f14756c276a8b4fbf0a3e72634ca4b7de

Author: samtstern

firestore/extend-with-functions/package.json

@@ -4,7 +4,7 @@
   "main": "index.js",
   "dependencies": {
     "firebase-functions": "^1.0.0",
-    "firebase-admin": "~5.11.0",
-    "@google-cloud/firestore": "^0.8.0"
+    "firebase-admin": "^5.13.0",
+    "@google-cloud/firestore": "^0.16.1"
   }
 }

firestore/main/index.js

@@ -678,6 +678,29 @@ function streamSnapshot(db, done) {
   // [END query_realtime]
 }
 
+function listenDiffs(db, done) {
+  // [START listen_diffs]
+  var observer = db.collection('cities').where('state', '==', 'CA')
+    .onSnapshot(querySnapshot => {
+      querySnapshot.docChanges.forEach(change => {
+        if (change.type === 'added') {
+          console.log('New city: ', change.doc.data());
+        }
+        if (change.type === 'modified') {
+          console.log('Modified city: ', change.doc.data());
+        }
+        if (change.type === 'removed') {
+          console.log('Removed city: ', change.doc.data());
+        }
+      });
+      // [START_EXCLUDE silent]
+      observer();
+      done();
+      // [END_EXCLUDE]
+    });
+  // [END listen_diffs]
+}
+
 function streamDocument(db, done) {
   // [START doc_realtime]
   var doc = db.collection('cities').doc('SF');
@@ -964,6 +987,10 @@ describe('Firestore Smoketests', () => {
     return streamSnapshot(db, done);
   });
 
+  it('should listen with diffs', (done) => {
+    return listenDiffs(db, done);
+  });
+
   it('should stream doc data', (done) => {
     return streamDocument(db, done);
   });

firestore/main/package.json

@@ -10,8 +10,8 @@
   "author": "",
   "license": "ISC",
   "dependencies": {
-    "@google-cloud/firestore": "^0.8.0",
-    "firebase-admin": "^5.4.0"
+    "@google-cloud/firestore": "^0.16.1",
+    "firebase-admin": "^5.13.1"
   },
   "devDependencies": {
     "mocha": "^3.3.0"

firestore/solution-aggregation/functions/package.json

@@ -9,7 +9,7 @@
     "logs": "firebase functions:log"
   },
   "dependencies": {
-    "firebase-admin": "~5.8.1",
+    "firebase-admin": "^5.13.0",
     "firebase-functions": "^1.0.1"
   },
   "private": true