feat: add hapi middleware

Author: bahmutov

README.md

@@ -73,7 +73,7 @@ You can also instrument your server-side code and produce combined coverage repo
 ```js
 const express = require('express')
 const app = express()
-require('@cypress/code-coverage/middleware')(app)
+require('@cypress/code-coverage/middleware/express')(app)
 ```
 
 **Tip:** you can register the endpoint only if there is global code coverage object, and you can exclude the middleware code from the coverage numbers
@@ -82,24 +82,25 @@ require('@cypress/code-coverage/middleware')(app)
 // https://github.com/gotwarlost/istanbul/blob/master/ignoring-code-for-coverage.md
 /* istanbul ignore next */
 if (global.__coverage__) {
-  require('@cypress/code-coverage/middleware')(app)
+  require('@cypress/code-coverage/middleware/express')(app)
 }
 ```
 
 If you use Hapi server, define the endpoint yourself and return the object
 
 ```js
-// https://github.com/gotwarlost/istanbul/blob/master/ignoring-code-for-coverage.md
-/* istanbul ignore next */
 if (global.__coverage__) {
-  // https://hapijs.com/tutorials/routing?lang=en_US
-  server.route({
-    method: 'GET',
-    path: '/__coverage__',
-    handler () {
-      return { coverage: global.__coverage__ }
-    }
-  })
+  require('@cypress/code-coverage/middleware/hapi')(server)
+}
+```
+
+For any other server, define the endpoint yourself and return the coverage object:
+
+```js
+if (global.__coverage__) {
+  // add method "GET /__coverage__" and response with JSON
+  onRequest = (response) =>
+    response.sendJSON({coverage: global.__coverage__ })
 }
 ```
 

middleware.js renamed to middleware/express.js

@@ -1,3 +1,4 @@
+// for Express.js
 module.exports = app => {
   // expose "GET __coverage__" endpoint that just returns
   // global coverage information (if the application has been instrumented)

middleware/hapi.js

@@ -0,0 +1,14 @@
+// for Hapi.js
+module.exports = server => {
+  // expose "GET __coverage__" endpoint that just returns
+  // global coverage information (if the application has been instrumented)
+
+  // https://hapijs.com/tutorials/routing?lang=en_US
+  server.route({
+    method: 'GET',
+    path: '/__coverage__',
+    handler () {
+      return { coverage: global.__coverage__ }
+    }
+  })
+}

package.json

@@ -34,7 +34,8 @@
   },
   "homepage": "https://github.com/cypress-io/code-coverage#readme",
   "files": [
-    "*.js"
+    "*.js",
+    "middleware"
   ],
   "publishConfig": {
     "access": "public"