fix: restore boot by updating Babel config and graphql-yoga v5 API

.babelrc

@@ -3,10 +3,10 @@
     [
       "@babel/preset-env",
       {
-        "targets": { "node": "current" },
-        "modules": "commonjs",
-        "useBuiltIns": "usage",
-        "debug": true
+        "targets": {
+          "node": "current"
+        },
+        "modules": "commonjs"
       }
     ]
   ]

README.md

@@ -81,16 +81,16 @@ To get the app up and running (and really see if it worked), run:
 
 ```
 $ npm start
-$ open http://localhost:4000
+$ open http://localhost:4000/graphql
 ```
 
-`npm start` will start the API server. Your browser should open up automatically to `http://localhost:4000` (if it doesn't, just open that yourself) and you should be able to start messing around with the app.
+`npm start` will start the API server. Your browser should open up automatically to `http://localhost:4000/graphql` (if it doesn't, just open that yourself) and you should be able to start messing around with the app.
 
 Here's what you should be looking at:
 
 <img width="800" alt="screen shot 2018-05-09 at 23 12 38" src="https://user-images.githubusercontent.com/742884/46708817-7aa72300-cbf5-11e8-8851-159d991cd537.png">
 
-GraphQL Playground is a great tool for writing and testing out queries. GraphQL Playground has some docs to explore on the right panel and offers an auto-complete-as-you-type experience. This is what GraphQL is all about, the developer experience! :-)
+GraphiQL is a great tool for writing and testing out queries. GraphiQL has some docs to explore on the right panel and offers an auto-complete-as-you-type experience. This is what GraphQL is all about, the developer experience! :-)
 
 [npm]: https://www.npmjs.com/
 [node]: https://nodejs.org

server.js

@@ -1,9 +1,10 @@
 // "graphql-yoga" is a pretty neat package 📦 for getting started w/ GraphQL quickly.
-// It's built on top of apollo-server (or Express) w/ some nice defaults.
-// It will include an IDE called GraphQL Playground for testing queries.
-// To read more about it, see https://github.com/prisma/graphql-yoga
+// It's a spec-compliant GraphQL server w/ some nice defaults.
+// It includes an IDE called GraphiQL for testing queries.
+// To read more about it, see https://the-guild.dev/graphql/yoga-server
 // ⚡
-const { GraphQLServer } = require('graphql-yoga');
+const { createYoga, createSchema } = require('graphql-yoga');
+const { createServer } = require('node:http');
 
 // "typeDefs" is your GraphQL schema.
 //
@@ -53,7 +54,15 @@ const resolvers = {
 // resolver functions.  This gets interesting when you can fetch schemas
 // remotely, mutate them, and pass them off to your server.
 // Google "GraphQL schema stitching" if you're interested.
-const server = new GraphQLServer({ typeDefs, resolvers });
+//
+// `createSchema` combines the typeDefs and resolvers into an executable
+// schema, and `createYoga` wraps it in a request handler.
+const yoga = createYoga({ schema: createSchema({ typeDefs, resolvers }) });
+
+// Yoga is just a plain Node request handler, so any HTTP server can serve it.
+const server = createServer(yoga);
 
 // Hello world!
-server.start(() => console.log('Server is running on localhost:4000'));
+server.listen(4000, () =>
+  console.log('Server is running on http://localhost:4000/graphql')
+);