use config module for env variables

Author: dominicarrojado

.env.stage.dev

@@ -0,0 +1,6 @@
+PORT=5000
+DB_HOST=db
+DB_PORT=5432
+DB_USERNAME=postgres
+DB_PASSWORD=postgres
+DB_DATABASE=postgres

.gitignore

@@ -32,4 +32,7 @@ lerna-debug.log*
 !.vscode/settings.json
 !.vscode/tasks.json
 !.vscode/launch.json
-!.vscode/extensions.json
+!.vscode/extensions.json
+
+# Environment variables
+.env.stage.prod

docker-compose.yml

@@ -11,6 +11,8 @@ services:
       - ./src:/app/src
     links:
       - db
+    environment:
+      STAGE: dev
 
   db:
     image: postgres

package.json

@@ -10,19 +10,20 @@
     "build": "nest build",
     "format": "prettier --write \"src/**/*.ts\" \"test/**/*.ts\"",
     "start": "nest start",
-    "start:dev": "nest start --watch",
-    "start:debug": "nest start --debug --watch",
-    "start:prod": "node dist/main",
+    "start:dev": "STAGE=dev nest start --watch",
+    "start:debug": "STAGE=dev nest start --debug --watch",
+    "start:prod": "STAGE=prod node dist/main",
     "lint": "eslint \"{src,apps,libs,test}/**/*.ts\" --fix",
-    "test": "jest",
-    "test:watch": "jest --watch",
-    "test:cov": "jest --coverage",
+    "test": "STAGE=dev jest",
+    "test:watch": "STAGE=dev jest --watch",
+    "test:cov": "STAGE=dev jest --coverage",
     "test:debug": "node --inspect-brk -r tsconfig-paths/register -r ts-node/register node_modules/.bin/jest --runInBand",
     "test:e2e": "jest --config ./test/jest-e2e.json",
     "docker-compose:dev": "docker-compose up --build"
   },
   "dependencies": {
     "@nestjs/common": "^8.0.0",
+    "@nestjs/config": "^2.0.0",
     "@nestjs/core": "^8.0.0",
     "@nestjs/platform-express": "^8.0.0",
     "@nestjs/typeorm": "^8.0.3",

src/app.module.ts

@@ -1,20 +1,30 @@
 import { Module } from '@nestjs/common';
+import { ConfigModule, ConfigService } from '@nestjs/config';
 import { TypeOrmModule } from '@nestjs/typeorm';
 import { AppController } from './app.controller';
 import { AppService } from './app.service';
 import { UsersModule } from './users/users.module';
 
 @Module({
   imports: [
-    TypeOrmModule.forRoot({
-      type: 'postgres',
-      host: 'db',
-      port: 5432,
-      username: 'postgres',
-      password: 'postgres',
-      database: 'postgres',
-      autoLoadEntities: true,
-      synchronize: true,
+    ConfigModule.forRoot({
+      envFilePath: [`.env.stage.${process.env.STAGE}`],
+    }),
+    TypeOrmModule.forRootAsync({
+      imports: [ConfigModule],
+      inject: [ConfigService],
+      useFactory: async (configService: ConfigService) => {
+        return {
+          type: 'postgres',
+          host: configService.get('DB_HOST'),
+          port: configService.get('DB_PORT'),
+          username: configService.get('DB_USERNAME'),
+          password: configService.get('DB_PASSWORD'),
+          database: configService.get('DB_DATABASE'),
+          autoLoadEntities: true,
+          synchronize: true,
+        };
+      },
     }),
     UsersModule,
   ],

yarn.lock

@@ -602,6 +602,16 @@
     tslib "2.3.1"
     uuid "8.3.2"
 
+"@nestjs/config@^2.0.0":
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/@nestjs/config/-/config-2.0.0.tgz#a8fbec48a2b55488ac50ad5ed4cf2df89d398171"
+  integrity sha512-Hi1k/1S5ogsS5c0OtNm72thiLSngijOaLDFaGI5ZPxNGpF23lctPg6ox3pYIOhXVRX/u+eiUIp71gswH2k8YNw==
+  dependencies:
+    dotenv "16.0.0"
+    dotenv-expand "8.0.2"
+    lodash "4.17.21"
+    uuid "8.3.2"
+
 "@nestjs/core@^8.0.0":
   version "8.4.4"
   resolved "https://registry.yarnpkg.com/@nestjs/core/-/core-8.4.4.tgz#94fd2d63fd77791f616fbecafb79faa2235eeeff"
@@ -2002,7 +2012,12 @@ domexception@^2.0.1:
   dependencies:
     webidl-conversions "^5.0.0"
 
-dotenv@^16.0.0:
+dotenv-expand@8.0.2:
+  version "8.0.2"
+  resolved "https://registry.yarnpkg.com/dotenv-expand/-/dotenv-expand-8.0.2.tgz#c75c6f695cff061a9ed9a95a520c6cc84b912188"
+  integrity sha512-vKKAk+VOzAWOV/dPIeSYqhgC/TQY+6L6Ibkzfsr8xd1stdBsTuGu9asCOXgbYbBeS+f2Y6lqqEuw7riOA+xEUQ==
+
+dotenv@16.0.0, dotenv@^16.0.0:
   version "16.0.0"
   resolved "https://registry.yarnpkg.com/dotenv/-/dotenv-16.0.0.tgz#c619001253be89ebb638d027b609c75c26e47411"
   integrity sha512-qD9WU0MPM4SWLPJy/r2Be+2WgQj8plChsyrCNQzW/0WjvcJQiKQJ9mH3ZgB3fxbUUxgc/11ZJ0Fi5KiimWGz2Q==
@@ -3513,7 +3528,7 @@ lodash.merge@^4.6.2:
   resolved "https://registry.yarnpkg.com/lodash.merge/-/lodash.merge-4.6.2.tgz#558aa53b43b661e1925a0afdfa36a9a1085fe57a"
   integrity sha512-0KpjqXRVvrYyCsX1swR/XTK0va6VQkQM6MNo7PqW77ByjAhoARA8EfrP1N4+KlKj8YS0ZUCtRT/YUuhyYDujIQ==
 
-lodash@^4.17.19, lodash@^4.17.21, lodash@^4.7.0:
+lodash@4.17.21, lodash@^4.17.19, lodash@^4.17.21, lodash@^4.7.0:
   version "4.17.21"
   resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.21.tgz#679591c564c3bffaae8454cf0b3df370c3d6911c"
   integrity sha512-v2kDEe57lecTulaDIuNTPy3Ry4gLGJ6Z1O3vE1krgXZNrsQ+LFTGHVxVjcXPs17LhbZVGedAJv8XZ1tvj5FvSg==