Refactored config

.env.example

@@ -1 +1,2 @@
-PORT=80
+HOST=127.0.0.1  # set 0.0.0.0 if you don't use reverse proxy
+PORT=8080

src/app.ts

@@ -1,4 +1,3 @@
-import { IConfigService } from "./config/config.interface";
 import { ConfigService } from "./config/config.service";
 
 import path from "path";
@@ -19,7 +18,7 @@ import publicConfig from "./publicConfig";
 import errorHandler from "./errors/handler";
 
 class App {
-  config: IConfigService;
+  config: ConfigService;
 
   constructor() {
     this.config = new ConfigService();
@@ -59,7 +58,7 @@ class App {
 
     fastify.setErrorHandler(errorHandler);
 
-    fastify.listen({ port: Number(this.config.get("PORT")) }, (err) => {
+    fastify.listen({ host: this.config.host, port: this.config.port }, (err) => {
       err && console.log(err);
     });
   }

src/config/config.interface.ts

@@ -1,3 +0,0 @@
-export interface IConfigService {
-  get(key: string): string;
-}

src/config/config.service.ts

@@ -1,30 +1,17 @@
-import { config, DotenvParseOutput } from "dotenv";
-import { IConfigService } from "./config.interface";
+import { config } from "dotenv";
 
-export class ConfigService implements IConfigService {
-  private config: DotenvParseOutput;
+export class ConfigService {
+  public readonly host: string;
+  public readonly port: number;
 
   constructor() {
-    const { error, parsed } = config();
-  
-    if (error) {
-      throw new Error(".env file not found");
-    }
+    const parsed = config().parsed;
 
     if (!parsed) {
       throw new Error("Invalid .env file");
     }
 
-    this.config = parsed;
-  }
-
-  get(key: string): string {
-    const res = this.config[key];
-
-    if (!res) {
-      throw new Error(`Key ${key} not found`);
-    }
-
-    return res;
+    this.host = process.env.HOST || 'localhost';
+    this.port = Number(process.env.PORT) || 8080;
   }
 }