feat(auth): add smtpRequired option to enforce SMTP settings during I…

src/models/auth.ts

@@ -58,6 +58,12 @@ export interface URLForAuthenticationConfig {
    * If a Grant for the provided email already exists, a Grant's re-auth will automatically be initiated.
    */
   loginHint?: string;
+  /**
+   * If set to true, the options=smtp_required parameter is added to the authentication URL.
+   * This forces users to provide SMTP settings during IMAP authentication, preventing
+   * send failures from missing SMTP configuration.
+   */
+  smtpRequired?: boolean;
 }
 
 /**

src/resources/auth.ts

@@ -215,6 +215,9 @@ export class Auth extends Resource {
     if (config.state) {
       url.searchParams.set('state', config.state);
     }
+    if (config.smtpRequired) {
+      url.searchParams.set('options', 'smtp_required');
+    }
 
     return url;
   }

tests/resources/auth.spec.ts

@@ -219,6 +219,29 @@ describe('Auth', () => {
           'https://test.api.nylas.com/v3/connect/auth?client_id=clientId&redirect_uri=https%3A%2F%2Fredirect.uri%2Fpath&access_type=online&response_type=code&provider=google&login_hint=loginHint&include_grant_scopes=true&scope=calendar&prompt=prompt&state=state'
         );
       });
+
+      it('should add options=smtp_required when smtpRequired is true', () => {
+        const url = auth.urlForOAuth2({
+          clientId: 'clientId',
+          redirectUri: 'https://redirect.uri/path',
+          provider: 'imap',
+          smtpRequired: true,
+        });
+
+        expect(url).toBe(
+          'https://test.api.nylas.com/v3/connect/auth?client_id=clientId&redirect_uri=https%3A%2F%2Fredirect.uri%2Fpath&access_type=online&response_type=code&provider=imap&options=smtp_required'
+        );
+      });
+
+      it('should not add options parameter when smtpRequired is not set', () => {
+        const url = auth.urlForOAuth2({
+          clientId: 'clientId',
+          redirectUri: 'https://redirect.uri/path',
+          provider: 'imap',
+        });
+
+        expect(url).not.toContain('options=');
+      });
     });
 
     describe('urlForAuthenticationPKCE', () => {