Fix/ES6 Migration: Complete CommonJS → ES6 Module Refactor

package.json

@@ -2,6 +2,7 @@
   "name": "enroll",
   "version": "1.0.0",
   "description": "Student Management System",
+  "type": "module",
   "main": "index.js",
   "scripts": {
     "start": "node ./src/config/index.js",

src/Config/config.js

@@ -1,9 +1,23 @@
-module.exports = {
+/**
+ * Sequelize database configuration for the 'development' environment.
+ * This file uses ES6 module syntax (`export default`).
+ */
+
+export default {
   development: {
+    // Uses environment variable DB_USER, falling back to 'root'
     username: process.env.DB_USER || 'root',
+
+    // Uses environment variable DB_PASS, falling back to null (no password)
     password: process.env.DB_PASS || null,
+
+    // Uses environment variable DB_NAME, falling back to 'EnrolNow'
     database: process.env.DB_NAME || 'EnrolNow',
+
+    // Uses environment variable DB_HOST, falling back to '127.0.0.1' (localhost)
     host: process.env.DB_HOST || '127.0.0.1',
+
+    // Specifies the database dialect
     dialect: 'mysql'
   }
 };

src/Config/db.js

@@ -1,7 +1,17 @@
-// db.js
-const { Sequelize } = require('sequelize');
-const config = require('./config').development;
+/**
+ * Sequelize database connection setup using ES6 modules.
+ * It imports the database configuration from './database.config.js'.
+ */
+import { Sequelize } from 'sequelize';
 
+// Import the default export (the configuration object) from the config file.
+// Note: The original CJS referred to './config', but we use the actual file name.
+import configModule from '../Config/config.js'; 
+
+// Destructure the specific 'development' environment configuration.
+const config = configModule.development;
+
+// Initialize Sequelize instance
 const sequelize = new Sequelize(
   config.database,
   config.username,
@@ -11,5 +21,5 @@ const sequelize = new Sequelize(
     dialect: config.dialect,
   }
 );
-
-module.exports = sequelize;
+// Export the initialized Sequelize instance
+export default sequelize;

src/Config/index.js

@@ -1,30 +1,52 @@
-global.__basedir = __dirname;
-const express = require('express');
+// --- ES Module Setup for __dirname and __filename ---
+// Import necessary modules for path resolution in ES modules
+import path from 'path';
+import { fileURLToPath } from 'url';
+
+// Derive ES module equivalents for CJS context
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = path.dirname(__filename);
+global.__basedir = __dirname; // Set the global basedir
+
+// --- Imports ---
+import express from 'express';
+import cookieParser from 'cookie-parser';
+import { config } from 'dotenv';
+
+// Initialize dotenv configuration immediately
+config();
+
+// Service Imports (Note: Must include .js extension for local modules)
+import UserRegister from "../api/Services/UserService.js";
+import ProgramService from '../api/Services/ProgramCourseServices.js';
+
+// Route Imports (Note: Must include .js extension for local modules)
+import userRoutes from '../api/Routes/userRoute.js';
+import ProgramRoutes from '../api/Routes/ProgramRoutes.js';
+import departmentRoutes from '../api/Routes/DepartmentRoutes.js';
+import InstructorRoutes from "../api/Routes/InstructorRoutes.js";
+
+// --- Application Setup ---
 const app = express();
 const port = 3000;
-const cookieparser = require('cookie-parser');
-app.use(express.json());
-app.use(cookieparser());
-require('dotenv').config();
 
-const UserRegister = require("../api/Services/UserService");
-const ProgramService = require('../api/Services/ProgramCourseServices')
-// Require the router
-const userRoutes = require('../api/Routes/userRoute');
-const ProgramRoutes = require('../api/Routes/ProgramRoutes');
-const departmentRoutes = require('../api/Routes/DepartmentRoutes')
-const InstructorRoutes = require("../api/Routes/InstructorRoutes")
+// Middleware
+app.use(express.json());
+app.use(cookieParser());
+app.use(express.urlencoded({ extended: true }));
 
 // Example route
 app.get('/', (req, res) => {
     res.send('Hello from Express API!');
 });
-app.use(express.urlencoded({ extended: true }));
-// Use the router at a mount path
+
+// Use the routers at their mount paths
 app.use('/users', userRoutes);
-app.use('/program', ProgramRoutes)
-app.use('/department', departmentRoutes)
-app.use("/instructor", InstructorRoutes)
+app.use('/program', ProgramRoutes);
+app.use('/department', departmentRoutes);
+app.use("/instructor", InstructorRoutes);
+
+// --- Start Server ---
 app.listen(port, () => {
     console.log(`Express API listening at http://localhost:${port}`);
 });

src/Database/Migrations/20250712044830-create-user.js

@@ -1,6 +1,6 @@
 'use strict';
 /** @type {import('sequelize-cli').Migration} */
-module.exports = {
+export default{
   async up(queryInterface, Sequelize) {
     await queryInterface.createTable('Users', {
       id: {
@@ -41,6 +41,7 @@ module.exports = {
       }
     });
   },
+
   async down(queryInterface, Sequelize) {
     await queryInterface.dropTable('Users');
   }

src/Database/Migrations/20250713051943-create-student.js

@@ -1,6 +1,6 @@
 'use strict';
 /** @type {import('sequelize-cli').Migration} */
-module.exports = {
+export default{
   async up(queryInterface, Sequelize) {
     await queryInterface.createTable('Students', {
       id: {

src/Database/Migrations/20250713052213-add-userId-fk-to-students.js

@@ -1,7 +1,7 @@
 'use strict';
 
 /** @type {import('sequelize-cli').Migration} */
-module.exports = {
+export default{
   async up (queryInterface, Sequelize) {
 
      await queryInterface.addConstraint('students', {

src/Database/Migrations/20250713080222-create-department.js

@@ -1,6 +1,6 @@
 'use strict';
 /** @type {import('sequelize-cli').Migration} */
-module.exports = {
+export default{
   async up(queryInterface, Sequelize) {
     await queryInterface.createTable('Departments', {
       department_id: {

src/Database/Migrations/20250713081004-create-instructor.js

@@ -1,6 +1,6 @@
 'use strict';
 /** @type {import('sequelize-cli').Migration} */
-module.exports = {
+export default{
   async up(queryInterface, Sequelize) {
     await queryInterface.createTable('Instructors', {
       id: {

src/Database/Migrations/20250714085001-create-program-course.js

@@ -1,6 +1,6 @@
 'use strict';
 /** @type {import('sequelize-cli').Migration} */
-module.exports = {
+export default{
   async up(queryInterface, Sequelize) {
     await queryInterface.createTable('ProgramCourses', {
       id: {

src/Database/Migrations/20250716055011-add-ProgramCourse-FK.js

@@ -2,7 +2,7 @@
 
 'use strict';
 /** @type {import('sequelize-cli').Migration} */
-module.exports = {
+export default{
   async up(queryInterface, Sequelize) {
     await queryInterface.addConstraint('programcourses', {
       fields: ['parent_id'],

src/Database/Migrations/20250805145527-add-fk-department-to-instructors.js

@@ -1,7 +1,7 @@
 'use strict';
 
 /** @type {import('sequelize-cli').Migration} */
-module.exports = {
+export default{
   async up (queryInterface, Sequelize) {
     /**
      * Add altering commands here.

src/Database/Migrations/20250806132734-add-fk-department-head.js

@@ -1,7 +1,7 @@
 'use strict';
 
 /** @type {import('sequelize-cli').Migration} */
-module.exports = {
+export default{
   async up (queryInterface, Sequelize) {
     /**
      * Add altering commands here.
@@ -29,6 +29,6 @@ module.exports = {
      * Example:
      * await queryInterface.dropTable('users');
      */
-     await queryInterface.removeConstraint('Instructors', 'fk_head_department_id');
+     await queryInterface.removeConstraint('Departments', 'fk_head_department_id');
   }
 };

src/Database/Migrations/20250807123944-create-department-instructor.js

@@ -1,7 +1,7 @@
 'use strict';
 
 /** @type {import('sequelize-cli').Migration} */
-module.exports = {
+export default{
   async up (queryInterface, Sequelize) {
     await queryInterface.createTable('DepartmentInstructors', {
       id: {

src/Database/Migrations/20250809014716-add-fk-ProgramCourse-Deparment.js

@@ -1,7 +1,7 @@
 'use strict';
 
 /** @type {import('sequelize-cli').Migration} */
-module.exports = {
+export default{
   async up(queryInterface, Sequelize) {
     await queryInterface.addConstraint('ProgramCourses', {
       fields: ['department_id'],

src/Database/Migrations/20250831140916-add-Instructor-TimeStamps.js

@@ -1,7 +1,7 @@
 'use strict';
 
 /** @type {import('sequelize-cli').Migration} */
-module.exports = {
+export default{
   async up (queryInterface, Sequelize) {
     /**
      * Add altering commands here.

src/Database/Migrations/20250909013953-Semesters.js

@@ -1,7 +1,7 @@
 'use strict';
 
 /** @type {import('sequelize-cli').Migration} */
-module.exports = {
+export default{
   async up (queryInterface, Sequelize) {
     /**
      * Add altering commands here.
@@ -77,7 +77,7 @@ module.exports = {
      * await queryInterface.dropTable('users');
      */
 
-   await queryInterface.removeConstraint('Semester', 'uq_program_semester');
+  //  await queryInterface.removeConstraint('Semester', 'uq_program_semester');
    await queryInterface.dropTable('Semester')
   }
 };

src/Database/seeders/20250805140906-demo-departments.js

@@ -1,7 +1,6 @@
 'use strict';
-const department = require("../../api/Models/department");
-
-module.exports = {
+/** @type {import('sequelize-cli').Migration} */
+export default{
   async up(queryInterface, Sequelize) {
     await queryInterface.bulkInsert('Departments', [
       {

src/Database/seeders/20250806125124-demo-instructors.js

@@ -1,7 +1,7 @@
 'use strict';
 
 /** @type {import('sequelize-cli').Migration} */
-module.exports = {
+export default{
   async up(queryInterface, Sequelize) {
     await queryInterface.bulkInsert('Instructors', [
       {

src/Database/seeders/20250807130913-demo-department-instructors.js

@@ -1,6 +1,6 @@
 'use strict';
-
-module.exports = {
+/** @type {import('sequelize-cli').Migration} */
+export default {
   async up(queryInterface, Sequelize) {
     // Fetch all instructors
     const [instructors] = await queryInterface.sequelize.query(

src/Database/seeders/20250809012319-demo-ProgramCourse.js

@@ -1,6 +1,6 @@
 'use strict';
-
-module.exports = {
+/** @type {import('sequelize-cli').Migration} */
+export default{
   async up(queryInterface, Sequelize) {
     // 1. Find the Computer Science department
     const [csDept] = await queryInterface.sequelize.query(