The road to zero TypeScript errors (#1756)

* Type fixes

* Type fixes

* Type fixes

* Type fixes

Co-authored-by: kodiakhq[bot] <49736102+kodiakhq[bot]@users.noreply.github.com>

lib/serverConfig.ts

@@ -1,10 +1,13 @@
-function detectTransport(): string | any {
+import SendmailTransport from "nodemailer/lib/sendmail-transport";
+import SMTPConnection from "nodemailer/lib/smtp-connection";
+
+function detectTransport(): SendmailTransport.Options | SMTPConnection.Options | string {
   if (process.env.EMAIL_SERVER) {
     return process.env.EMAIL_SERVER;
   }
 
   if (process.env.EMAIL_SERVER_HOST) {
-    const port = parseInt(process.env.EMAIL_SERVER_PORT);
+    const port = parseInt(process.env.EMAIL_SERVER_PORT!);
     const transport = {
       host: process.env.EMAIL_SERVER_HOST,
       port,