fix: parse TO_EMAIL as comma-separated list

api/contact/config.ts

@@ -3,13 +3,14 @@ import { Resend } from "resend";
 export interface Config {
   resend: Resend | null;
   fromEmail: string | undefined;
-  toEmail: string | string[] | undefined;
+  toEmails: string[];
   allowedOrigins: string[];
 }
 
 const apiKey = process.env["RESEND_API_KEY"];
 const fromEmail = process.env["FROM_EMAIL"];
-const toEmail = process.env["TO_EMAIL"];
+const toEmailsRaw = process.env["TO_EMAIL"] ?? "";
+const toEmails = toEmailsRaw.split(",").map(o => o.trim()).filter(Boolean);
 const allowedOriginsRaw = process.env["ALLOWED_ORIGINS"] ?? "";
 const allowedOrigins = allowedOriginsRaw.split(",").map(o => o.trim()).filter(Boolean);
 
@@ -19,7 +20,7 @@ if (apiKey) resend = new Resend(apiKey);
 export const config: Config = {
   resend,
   fromEmail,
-  toEmail,
+  toEmails,
   allowedOrigins
 }
 

api/contact/email.ts

@@ -5,16 +5,16 @@ import type { Config } from "./config.js";
 export interface EmailConfig {
   client: Resend;
   from: string;
-  to: string | string[];
+  to: string[];
 }
 
 export function getEmailConfig(config: Config): EmailConfig | null {
   if (
     !config.resend || 
     !config.fromEmail?.trim() || 
-    !config.toEmail?.length 
+    !config.toEmails?.length 
   ) return null;
-  return { client: config.resend, from: config.fromEmail, to: config.toEmail };
+  return { client: config.resend, from: config.fromEmail, to: config.toEmails };
 }
 
 export async function sendEmail(config: EmailConfig, body: ContactBody): Promise<void> {

tests/contact/email.test.ts

@@ -20,18 +20,17 @@ describe("email.ts", () => {
 
   describe("getEmailConfig", () => {
     it("returns null if config missing or empty props", () => {
-      expect(getEmailConfig({ resend: null as any, fromEmail: "a@b.com", toEmail: "c@d.com" })).toBeNull();
-      expect(getEmailConfig({ resend: {} as any, fromEmail: "", toEmail: "c@d.com" })).toBeNull();
-      expect(getEmailConfig({ resend: {} as any, fromEmail: "a@b.com", toEmail: "" })).toBeNull();
-      expect(getEmailConfig({ resend: {} as any, fromEmail: "a@b.com", toEmail: [] })).toBeNull();
+      expect(getEmailConfig({ resend: null as any, fromEmail: "a@b.com", toEmails: ["c@d.com"] })).toBeNull();
+      expect(getEmailConfig({ resend: {} as any, fromEmail: "", toEmails: ["c@d.com"] })).toBeNull();
+      expect(getEmailConfig({ resend: {} as any, fromEmail: "a@b.com", toEmails: [] })).toBeNull();
     });
 
     it("returns EmailConfig when valid", () => {
-      const result = getEmailConfig({ resend: mockResend, fromEmail: "from@test.com", toEmail: "to@test.com" });
+      const result = getEmailConfig({ resend: mockResend, fromEmail: "from@test.com", toEmails: ["to@test.com"] });
       expect(result).toMatchObject({
         client: mockResend,
         from: 'from@test.com',
-        to: 'to@test.com'
+        to: ['to@test.com']
       });
     });
   });