Apollo Serverのサンプルを追加

functions/src/index.ts

@@ -0,0 +1,36 @@
+import { ApolloServer, gql } from "apollo-server-cloud-functions";
+import * as functions from 'firebase-functions';
+
+const typeDefs = gql`
+  # Comments in GraphQL strings (such as this one) start with the hash (#) symbol.
+
+  type Book {
+    title: String
+    author: String
+  }
+
+  type Query {
+    books: [Book]
+  }
+`;
+
+const books = [
+    {
+        title: 'Harry Potter and the Chamber of Secrets',
+        author: 'J.K. Rowling',
+    },
+    {
+        title: 'Jurassic Park',
+        author: 'Michael Crichton',
+    },
+];
+
+const resolvers = {
+    Query: {
+        books: () => books,
+    },
+};
+
+const server = new ApolloServer({ typeDefs, resolvers });
+
+exports.handler = functions.https.onRequest(server.createHandler());