feat: setup config module

add path alias of config dir

package.json

@@ -21,9 +21,9 @@
     "release": "semantic-release",
     "start": "nest start",
     "start:debug": "nest start --debug --watch",
-    "start:dev": "NODE_OPTIONS='-r dotenv/config' nest start --watch",
+    "start:dev": "nest start --watch",
     "start:prod": "node dist/main",
-    "start:repl": "NODE_OPTIONS='-r @suncin/dotenv' nest start --entryFile repl",
+    "start:repl": "nest start --entryFile repl",
     "test": "jest --selectProjects 'Unit test'",
     "test:cov": "jest --selectProjects 'Unit test' --coverage",
     "test:debug": "node --inspect-brk -r tsconfig-paths/register -r ts-node/register node_modules/.bin/jest --runInBand",
@@ -34,6 +34,7 @@
   },
   "dependencies": {
     "@nestjs/common": "^9.0.0",
+    "@nestjs/config": "^2.2.0",
     "@nestjs/core": "^9.0.0",
     "@nestjs/jwt": "^9.0.0",
     "@nestjs/mapped-types": "^1.1.0",

src/app.module.ts

@@ -1,13 +1,20 @@
 import { Module } from '@nestjs/common';
+import { ConfigModule } from '@nestjs/config';
 import { TypeOrmModule } from '@nestjs/typeorm';
 
 import { AppController } from '~app/app.controller';
 import { AppService } from '~app/app.service';
 import { AuthModule } from '~auth/auth.module';
 import { BlogModule } from '~blog/blog.module';
+import { configuration } from '~config/configuration';
 
 @Module({
   imports: [
+    ConfigModule.forRoot({
+      isGlobal: true,
+      expandVariables: true,
+      load: [configuration],
+    }),
     TypeOrmModule.forRoot({
       type: 'postgres',
       url: process.env.DATABASE_URL,

src/config/configuration.ts

@@ -0,0 +1,12 @@
+import invariant from 'tiny-invariant';
+
+export type ConfigObject = ReturnType<typeof configuration>;
+
+export function configuration() {
+  invariant(process.env.SECRET, 'SECRET is missing');
+
+  return {
+    port: Number.parseInt(process.env.PORT, 10) || 3000,
+    secret: process.env.SECRET,
+  };
+}

src/main.ts

@@ -1,12 +1,15 @@
 import { HttpStatus, ValidationPipe } from '@nestjs/common';
+import { ConfigService } from '@nestjs/config';
 import { NestFactory } from '@nestjs/core';
 import { useContainer } from 'class-validator';
 import cookieParser from 'cookie-parser';
 
 import { AppModule } from '~app/app.module';
+import type { ConfigObject } from '~config/configuration';
 
 async function bootstrap() {
   const app = await NestFactory.create(AppModule);
+  const config = app.get<ConfigService<ConfigObject, true>>(ConfigService);
 
   app.useGlobalPipes(
     new ValidationPipe({
@@ -15,10 +18,10 @@ async function bootstrap() {
       errorHttpStatusCode: HttpStatus.UNPROCESSABLE_ENTITY,
     }),
   );
-  app.use(cookieParser(process.env.SECRET));
+  app.use(cookieParser(config.getOrThrow('secret')));
   useContainer(app.select(AppModule), { fallbackOnErrors: true });
 
-  await app.listen(process.env.PORT ?? 3000);
+  await app.listen(config.get('port'));
 }
 
 // eslint-disable-next-line unicorn/prefer-top-level-await

tsconfig.json

@@ -17,6 +17,7 @@
       "~auth/*": ["src/auth/*"],
       "~blog/*": ["src/blog/*"],
       "~common/*": ["src/common/*"],
+      "~config/*": ["src/config/*"],
       "~migrations/*": ["src/migrations/*"]
     }
   }