chore(backend): bootstrap Express + TypeScript + Prisma

eme-backend/src/config/env.ts

@@ -0,0 +1,47 @@
+import dotenv from 'dotenv';
+
+dotenv.config();
+
+function required(name: string): string {
+  const value = process.env[name];
+
+  if (!value) {
+    throw new Error(`Variable d'environnement manquante: ${name}`);
+  }
+
+  return value;
+}
+
+function numberFromEnv(name: string, defaultValue: number): number {
+  const value = process.env[name];
+
+  if (!value) {
+    return defaultValue;
+  }
+
+  const parsed = Number(value);
+
+  if (Number.isNaN(parsed)) {
+    throw new Error(`Variable d'environnement invalide: ${name}`);
+  }
+
+  return parsed;
+}
+
+export const env = {
+  port: numberFromEnv('PORT', 3000),
+  nodeEnv: process.env.NODE_ENV || 'development',
+  frontendUrl: required('FRONTEND_URL'),
+  databaseUrl: required('DATABASE_URL'),
+  db: {
+    server: required('DB_SERVER'),
+    port: numberFromEnv('DB_PORT', 1433),
+    name: required('DB_NAME'),
+    user: required('DB_USER'),
+    password: required('DB_PASSWORD'),
+  },
+  azure: {
+    tenantId: required('AZURE_TENANT_ID'),
+    clientId: required('AZURE_CLIENT_ID'),
+  },
+};