Point package.json:bin at cli.js

cli.js

@@ -0,0 +1 @@
+require('./lib/index').start()

package.json

@@ -3,10 +3,11 @@
   "version": "5.1.3",
   "description": "An Express server and middleware for querying the MusicBrainz API using GraphQL.",
   "main": "lib/index.js",
-  "bin": "lib/index.js",
+  "bin": "cli.js",
   "files": [
     "lib",
     "scripts",
+    "cli.js",
     "Procfile",
     "schema.json",
     "yarn.lock"

src/index.js

@@ -31,7 +31,7 @@ const middleware = ({
 
 export default middleware
 
-if (require.main === module) {
+export function start () {
   require('dotenv').config({ silent: true })
   const app = express()
   const port = process.env.PORT || 3000
@@ -41,3 +41,7 @@ if (require.main === module) {
   app.listen(port)
   console.log(`Listening on port ${port}.`)
 }
+
+if (require.main === module) {
+  start()
+}