pass the resend api key as env to the preview server

Author: gabrielmfern

packages/react-email/src/utils/preview/get-env-variables-for-preview-app.ts

@@ -4,11 +4,13 @@ export const getEnvVariablesForPreviewApp = (
   relativePathToEmailsDirectory: string,
   previewServerLocation: string,
   cwd: string,
+  resendApiKey?: string,
 ) => {
   return {
     EMAILS_DIR_RELATIVE_PATH: relativePathToEmailsDirectory,
     EMAILS_DIR_ABSOLUTE_PATH: path.resolve(cwd, relativePathToEmailsDirectory),
     PREVIEW_SERVER_LOCATION: previewServerLocation,
     USER_PROJECT_LOCATION: cwd,
+    RESEND_API_KEY: resendApiKey,
   } as const;
 };

packages/react-email/src/utils/preview/start-dev-server.ts

@@ -5,6 +5,7 @@ import { createJiti } from 'jiti';
 import logSymbols from 'log-symbols';
 import ora from 'ora';
 import { registerSpinnerAutostopping } from '../../utils/register-spinner-autostopping.js';
+import { conf } from '../conf.js';
 import { getPreviewServerLocation } from '../get-preview-server-location.js';
 import { packageJson } from '../packageJson.js';
 import { styleText } from '../style-text.js';
@@ -131,6 +132,7 @@ export const startDevServer = async (
       path.normalize(emailsDirRelativePath),
       previewServerLocation,
       process.cwd(),
+      conf.get('resendApiKey'),
     ),
   };