feat: Microservice and boilerplate for mailer

apps/core-mailer/.dockerignore

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+    node_modules
+    build

apps/core-mailer/.eslintrc.js

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+module.exports = {
+  root: true,
+  extends: ['custom'],
+};

apps/core-mailer/Dockerfile

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+FROM node:16-alpine AS builder
+RUN apk update && apk add --no-cache libc6-compat
+RUN corepack enable && corepack prepare [email protected] --activate 
+
+WORKDIR /app
+
+RUN npm install turbo
+
+COPY ../../. .
+
+RUN pnpm install
+
+RUN pnpm run build --filter=core-mailer... 
+
+FROM node:18-alpine
+
+COPY --from=builder /app/apps/core-mailer/dist .
+
+ENV PORT=80
+
+CMD ["app.js"]

apps/core-mailer/package.json

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+{
+  "name": "core-mailer",
+  "version": "1.0.0",
+  "description": "",
+  "main": "build/index.js",
+  "scripts": {
+    "build": "npm run clean & webpack --config webpack.config.js",
+    "clean": "rimraf dist & rimraf build",
+    "dev": "concurrently \"npx tsc --watch\" \"nodemon -q build/index.js\"",
+    "start": "node dist/app.js",
+    "lint": "eslint --ext .ts src"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "body-parser": "^1.20.2",
+    "cors": "^2.8.5",
+    "dotenv": "^16.0.3",
+    "express": "^4.18.2",
+    "nodemailer": "^6.9.9"
+  },
+  "devDependencies": {
+    "@types/nodemailer": "^6.4.14",
+    "@types/chai": "^4.3.5",
+    "@types/express": "^4.17.17",
+    "@types/node": "^20.10.5",
+    "@types/pg": "^8.10.1",
+    "@typescript-eslint/eslint-plugin": "^6.7.3",
+    "concurrently": "^8.0.1",
+    "eslint": "^8.56.0",
+    "eslint-config-custom": "*",
+    "eslint-config-standard-with-typescript": "^43.0.0",
+    "eslint-plugin-import": "^2.27.5",
+    "eslint-plugin-n": "^16.5.0",
+    "eslint-plugin-prettier": "^5.0.0",
+    "eslint-plugin-promise": "^6.1.1",
+    "nodemon": "^3.0.1",
+    "prettier": "3.1.1",
+    "rimraf": "^5.0.1",
+    "ts-loader": "^9.5.1",
+    "tsconfig": "workspace:*",
+    "typescript": "^5.0.4",
+    "webpack": "^5.89.0",
+    "webpack-cli": "^5.1.4"
+  }
+}

apps/core-mailer/src/controller/mail.ts

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+import { createTransport } from 'nodemailer';
+
+const transporter = createTransport({
+  service: 'Gmail',
+  host: 'smtp.gmail.com',
+  port: 465,
+  secure: true,
+  auth: {
+    user: process.env.EMAIL_ADDRESS,
+    pass: process.env.EMAIL_PASSWORD,
+  },
+});
+
+export const sendMail = async (email: string, subject: string, text: string) => {
+  try {
+    const mailOptions = {
+      from: process.env.EMAIL_ADDRESS,
+      to: email,
+      subject: subject,
+      text: text,
+    };
+
+    const info = await transporter.sendMail(mailOptions);
+    console.log('Message sent: %s', info.messageId);
+  } catch (error) {
+    console.error(error);
+  }
+};

apps/core-mailer/src/index.ts

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+import express, { Request, Response } from 'express';
+import dotenv from 'dotenv';
+import { sendMail } from './controller/mail';
+
+const bodyParser = require('body-parser');
+const cors = require('cors');
+dotenv.config();
+
+const port = process.env.PORT || 80;
+
+const app = express();
+app.use(
+  cors({
+    origin: '*',
+  }),
+);
+app.use(bodyParser.json());
+
+app.get('/health', (req: Request, res: Response) => {
+  const healthcheck: any = {
+    resource: 'Techno Mailer Server',
+    uptime: process.uptime(),
+    responseTime: process.hrtime(),
+    message: 'OK',
+    timestamp: Date.now(),
+  };
+  try {
+    res.send(healthcheck);
+  } catch (error) {
+    healthcheck.message = error;
+    res.status(503).send();
+  }
+});
+
+app.post('/send-mail', async (req: Request, res: Response) => {
+  const { email, subject, text } = req.body;
+  try {
+    await sendMail(email, subject, text);
+    res.status(200).send('Email sent successfully');
+  } catch (error) {
+    res.status(500).send('Email failed to send');
+  }
+});
+
+app.listen(port, () => {
+  console.log(`Server is running at http://localhost:${port}`);
+});

apps/core-mailer/tsconfig.json

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+{
+  "extends": "tsconfig/tsconfig.json",
+  "compilerOptions": {
+    "outDir": "./build/",
+    "esModuleInterop": true
+  },
+  "include": ["src/**/*"],
+  "exclude": ["node_modules"]
+}

apps/core-mailer/webpack.config.js

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+const path = require('path');
+
+module.exports = {
+  target: 'node',
+  entry: './src/index.ts',
+  output: {
+    path: path.resolve(__dirname, 'dist'),
+    filename: 'app.js',
+  },
+  mode: 'production',
+  module: {
+    rules: [
+      {
+        test: /\.tsx?$/,
+        use: 'ts-loader',
+        exclude: /node_modules/,
+      },
+    ],
+  },
+  resolve: {
+    extensions: ['.tsx', '.ts', '.js'],
+  },
+};