fix: port loading on heroku

lib/utils/configuration-loader.mjs

@@ -1,17 +1,24 @@
 
 import dotenv from 'dotenv'
 
-export default async function load () {
-  const configuration = dotenv.config()
+export default async function load (path) {
+  const result = dotenv.config({ path })
+
+  if (result.error) {
+    throw result.error
+  }
 
   /**
    * This function is async because we could
    * load some KEYS from external services (like AWS Secrets Manager)
    * in future
    */
 
-  configuration.fastify = {
-    logger: configuration.NODE_ENV !== 'production'
+  const configuration = {
+    ...process.env,
+    fastify: {
+      logger: result.parsed.NODE_ENV !== 'production'
+    }
   }
 
   return configuration

test/config-loader.test.mjs

@@ -0,0 +1,32 @@
+
+import path from 'path'
+import t from 'tap'
+import { fileURLToPath } from 'url'
+
+import configurationLoader from '../lib/utils/configuration-loader.mjs'
+
+t.test('check config loaded', async t => {
+  const __dirname = path.dirname(fileURLToPath(import.meta.url))
+  const config = await configurationLoader(path.join(__dirname, '../.env.example'))
+  t.like(config, {
+    NODE_ENV: 'development',
+    BASE_URL: 'http://localhost:3000',
+    DISCORD_CLIENT_ID: '12345678',
+    DISCORD_SECRET: 'XXXXXXXXXXXXXXXXX',
+    DB_URI: 'mongodb+srv://<user>:<password>@playground.xxxxx.mongodb.net/<dbname>?retryWrites=true&w=majority'
+  })
+})
+
+t.test('check PORT loaded', async t => {
+  const __dirname = path.dirname(fileURLToPath(import.meta.url))
+  process.env.PORT = '123456789'
+  const config = await configurationLoader(path.join(__dirname, '../.env.example'))
+  t.like(config, {
+    PORT: '123456789',
+    NODE_ENV: 'development',
+    BASE_URL: 'http://localhost:3000',
+    DISCORD_CLIENT_ID: '12345678',
+    DISCORD_SECRET: 'XXXXXXXXXXXXXXXXX',
+    DB_URI: 'mongodb+srv://<user>:<password>@playground.xxxxx.mongodb.net/<dbname>?retryWrites=true&w=majority'
+  })
+})