init

packages/next-utils/src/index.ts

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+// Simple in-memory rate limiting
+const submissions: Record<string, number> = {};
+const RATE_LIMIT_WINDOW = 60 * 60 * 1000; // 1 hour
+const MAX_SUBMISSIONS_PER_WINDOW = 3;
+
+export async function rateLimit(identifier: string, windowMs = RATE_LIMIT_WINDOW, maxSubmissions = MAX_SUBMISSIONS_PER_WINDOW) {
+  const now = Date.now();
+
+  // Clean up old submissions
+  Object.keys(submissions).forEach((key) => {
+    if (now - submissions[key] > windowMs) {
+      delete submissions[key];
+    }
+  });
+
+  // Check if identifier has exceeded submission limit
+  const currentSubmissions = Object.values(submissions).filter(
+    (timestamp) => now - timestamp <= windowMs
+  );
+
+  if (currentSubmissions.length >= maxSubmissions) {
+    throw new Error("Too many submissions. Please try again later.");
+  }
+
+  // Record this submission
+  submissions[identifier] = now;
+}
+
+export const languages = ["en", "de"] as const;
+export type Lang = (typeof languages)[number];
+
+export function isValidLang(lang: string): lang is Lang {
+  return (languages as readonly string[]).includes(lang);
+}
+
+export * from "./i18n";
+export * from "./env";