🛠️Add environment configuration with validation using Zod; create env…

….ts for managing environment variables and defaults; implement error handling for invalid configurations.

fc-back/env.ts

@@ -0,0 +1,48 @@
+import { z } from "zod";
+import * as dotenv from "dotenv";
+
+dotenv.config({ path: "./.env" });
+
+const EnvSchema = z.object({
+	BETTER_AUTH_SECRET: z.string(),
+	BETTER_AUTH_URL: z.string().url().default("http://localhost:3000"),
+	ALLOWED_ORIGINS: z
+		.string()
+		.default("http://localhost:3000,http://localhost:5173"),
+
+	GOOGLE_CLIENT_ID: z.string(),
+	GOOGLE_CLIENT_SECRET: z.string(),
+	GITHUB_CLIENT_ID: z.string(),
+	GITHUB_CLIENT_SECRET: z.string(),
+
+	EMAIL_VERIFICATION_CALLBACK_URL: z
+		.string()
+		.default("http://localhost:3000/email-verified"),
+	RESEND_API: z.string(),
+	TURNSTILE_SECRET_KEY: z.string(),
+	TURNSTILE_VERIFY_URL: z
+		.string()
+		.url()
+		.default("https://challenges.cloudflare.com/turnstile/v0/siteverify"),
+
+	DB_FILE_NAME: z.string().default("file:database.sqlite"),
+
+	PG_PASSWORD: z.string(),
+	PG_USER: z.string().default("postgres"),
+	PG_DATABASE: z.string(),
+	PG_PORT: z.coerce.number().default(5432),
+
+	NODE_ENV: z.string().default("development"),
+});
+
+export type env = z.infer<typeof EnvSchema>;
+
+const { data: env, error } = EnvSchema.safeParse(process.env);
+
+if (error) {
+	console.error("🔥Invalid env: ");
+	console.error(JSON.stringify(error.flatten().fieldErrors, null, 2));
+	process.exit(1);
+}
+
+export default env!;