feat: changed backend-pg to backend

backend/src/lib/validator/index.ts

@@ -0,0 +1 @@
+export { isDisposableEmail } from "./validate-email";

backend/src/lib/validator/validate-email.ts

@@ -0,0 +1,10 @@
+import fs from "fs/promises";
+import path from "path";
+
+export const isDisposableEmail = async (email: string) => {
+  const emailDomain = email.split("@")[1];
+  const disposableEmails = await fs.readFile(path.join(__dirname, "disposable_emails.txt"), "utf8");
+
+  if (disposableEmails.split("\n").includes(emailDomain)) return true;
+  return false;
+};