add type and generic snippets

Author: morganchen12

firestore-next/test.firestore.js

@@ -1350,6 +1350,7 @@ describe("firestore-pipelines", () => {
         or,
         xor,
         conditional,
+        concat,
         like,
         execute
     } = require("firebase/firestore/pipelines");
@@ -1368,6 +1369,24 @@ describe("firestore-pipelines", () => {
         db = getFirestore(app, "enterprise");
     });
 
+    async function typeAndGenericFunctionsExample() {
+      // [START type_function]
+      field("rating").type();
+      // [END type_function]
+
+      // [START concat_function]
+      concat(constant("Author ID: "), field("authorId"));
+      // [END concat_function]
+
+      // [START length_function]
+      field("tags").length();
+      // [END length_function]
+
+      // [START reverse_function]
+      field("tags").reverse();
+      // [END reverse_function]
+    }
+
     async function stagesExpressionsExample() {
       // [START stages_expressions_example]
       const trailing30Days = constant(Timestamp.now().toMillis())

firestore-temp/test.firestore.js

@@ -23,7 +23,8 @@ describe("firestore-pipelines", () => {
         like,
         or,
         xor,
-        conditional
+        conditional,
+        concat
     } = require("@google-cloud/firestore/pipelines");
 
     let app;
@@ -36,6 +37,24 @@ describe("firestore-pipelines", () => {
       });
     });
 
+    async function typeAndGenericFunctionsExample() {
+      // [START type_function]
+      field("rating").type();
+      // [END type_function]
+
+      // [START concat_function]
+      concat(constant("Author ID: "), field("authorId"));
+      // [END concat_function]
+
+      // [START length_function]
+      field("tags").length();
+      // [END length_function]
+
+      // [START reverse_function]
+      field("tags").reverse();
+      // [END reverse_function]
+    }
+
     async function queryExplainExample() {
       // [START query_explain]
       const q = db.collection("cities").where("country", "==", "USA");