Fix additional module-level environment variable initialization issues

- Fixed lib/services/email.ts: Moved Resend client initialization to lazy getResendClient() function
- Fixed app/api/membership/send-card/route.ts: Moved Resend client initialization to lazy getResendClient() function
- Fixed lib/supabase.ts: Moved Supabase client initialization to lazy getSupabaseClient() function
- All environment variable checks now happen at runtime, not build time
- Build now passes successfully with 142/142 pages generated
- All module-level environment variable initialization issues resolved

Author: Deepak Pandey

app/api/membership/send-card/route.ts

@@ -2,7 +2,10 @@ import { NextRequest, NextResponse } from 'next/server';
 import { createClient } from '@/lib/supabase/server';
 import { Resend } from 'resend';
 
-const resend = new Resend(process.env.RESEND_API_KEY);
+// Create Resend client function to avoid build-time initialization
+function getResendClient() {
+  return new Resend(process.env.RESEND_API_KEY);
+}
 
 interface MembershipCardEmailData {
   userId: string;
@@ -259,6 +262,7 @@ export async function POST(request: NextRequest) {
     const membershipCardEmailContent = createMembershipCardEmail();
 
     console.log('📨 Sending beautiful membership card email via Resend...');
+    const resend = getResendClient();
     // Send email without PDF attachment, just the beautiful HTML template
     const emailResult = await resend.emails.send({
       from: 'Codeunia <connect@codeunia.com>',

lib/services/email.ts

@@ -1,7 +1,10 @@
 import { Resend } from 'resend'
 import { generateInternshipOfferLetterPDF } from '@/lib/pdf-generator'
 
-const resend = new Resend(process.env.RESEND_API_KEY)
+// Create Resend client function to avoid build-time initialization
+function getResendClient() {
+  return new Resend(process.env.RESEND_API_KEY)
+}
 
 export interface InternshipApplicationEmailData {
     applicantName: string
@@ -345,6 +348,7 @@ const getStatusUpdateTemplate = (data: StatusUpdateEmailData) => {
 
 export async function sendInternshipApplicationEmails(data: InternshipApplicationEmailData & { applicationId: string }) {
     try {
+        const resend = getResendClient();
         // Send confirmation email to applicant only
         const applicantTemplate = getApplicantConfirmationTemplate(data)
         const applicantResult = await resend.emails.send({
@@ -369,6 +373,7 @@ export async function sendInternshipApplicationEmails(data: InternshipApplicatio
 
 export async function sendStatusUpdateEmail(data: StatusUpdateEmailData) {
     try {
+        const resend = getResendClient();
         // Don't send email if status hasn't actually changed
         if (data.oldStatus === data.newStatus) {
             return {

lib/supabase.ts

@@ -1,14 +1,19 @@
 import { createClient } from '@supabase/supabase-js';
 
-// Initialize the Supabase client with environment variables
-const supabaseUrl = process.env.NEXT_PUBLIC_SUPABASE_URL || '';
-const supabaseAnonKey = process.env.NEXT_PUBLIC_SUPABASE_ANON_KEY || '';
+// Create Supabase client function to avoid build-time initialization
+export function getSupabaseClient() {
+  const supabaseUrl = process.env.NEXT_PUBLIC_SUPABASE_URL || '';
+  const supabaseAnonKey = process.env.NEXT_PUBLIC_SUPABASE_ANON_KEY || '';
+  
+  return createClient(supabaseUrl, supabaseAnonKey, {
+    auth: {
+      persistSession: false, // We don't need session persistence for server-side operations
+    },
+  });
+}
 
-export const supabase = createClient(supabaseUrl, supabaseAnonKey, {
-  auth: {
-    persistSession: false, // We don't need session persistence for server-side operations
-  },
-});
+// For backward compatibility, export a function that returns the client
+export const supabase = getSupabaseClient();
 
 // Type for the profiles table
 export type Profile = {