feat: extract koa middleware into its own package

Author: morajabi

packages/graphql-playground-middleware-koa/.gitignore

@@ -0,0 +1,18 @@
+# See http://help.github.com/ignore-files/ for more about ignoring files.
+
+# dependencies
+node_modules
+example/node_modules
+example/yarn.lock
+
+# testing
+/coverage
+
+# production
+/dist
+
+# misc
+.DS_Store
+.env
+npm-debug.log
+.idea

packages/graphql-playground-middleware-koa/examples/basic/README.md

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+# GraphQL Playground Koa.js Example
+
+```sh
+$ yarn
+$ node index.js
+```

packages/graphql-playground-middleware-koa/examples/basic/index.js

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+const koa = require('koa')
+const koaRouter = require('koa-router')
+const koaBody = require('koa-bodyparser')
+const { graphqlKoa } = require('apollo-server-koa')
+const {makeExecutableSchema} = require('graphql-tools')
+const koaPlayground = require('graphql-playground-middleware-koa')
+
+const schema = makeExecutableSchema({
+  typeDefs: `
+    type Query {
+      hello: String!
+    }
+    schema {
+      query: Query
+    }
+  `,
+  resolvers: {
+    Query: {
+      hello: () => 'world',
+    },
+  },
+})
+
+const app = new koa();
+const router = new koaRouter();
+const PORT = 4000;
+
+// koaBody is needed just for POST.
+app.use(koaBody());
+
+router.post('/graphql', graphqlKoa({ schema }));
+
+router.all('/playground', koaPlayground({
+  endpoint: '/graphql'
+}))
+
+app.use(router.routes());
+app.use(router.allowedMethods());
+app.listen(PORT);
+
+console.log(`Serving the GraphQL Playground on http://localhost:${PORT}/playground`)

packages/graphql-playground-middleware-koa/examples/basic/package.json

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+{
+  "name": "koa",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "apollo-server-koa": "^1.2.0",
+    "graphql": "^0.11.7",
+    "graphql-playground-middleware-koa": "^1.0.0",
+    "graphql-tools": "^2.7.1",
+    "koa": "^2.3.0",
+    "koa-bodyparser": "^4.2.0",
+    "koa-router": "^7.2.1"
+  }
+}