Skip host theme generation when theme flag is provided

packages/app/src/cli/services/dev/processes/theme-app-extension-next.ts

@@ -9,7 +9,7 @@ import {Theme} from '@shopify/cli-kit/node/themes/types'
 interface PreviewThemeAppExtensionsOptions {
   adminSession: AdminSession
   developerPlatformClient: DeveloperPlatformClient
-  theme?: string
+  themeId?: string
   themeExtensionPort?: number
 }
 
@@ -20,15 +20,14 @@ export interface PreviewThemeAppExtensionsProcess extends BaseProcess<PreviewThe
 const runThemeAppExtensionsServerNext: DevProcessFunction<PreviewThemeAppExtensionsOptions> = async (
   {stdout: _stdout, stderr: _stderr, abortSignal: _abortSignal},
   {
-    adminSession,
+    adminSession: _adminSession,
     developerPlatformClient: _developerPlatformClient,
-    theme: _theme,
+    themeId: _themeId,
     themeExtensionPort: _themeExtensionPort,
   },
 ) => {
   outputInfo('This feature is currently in development and is not ready for use or testing yet.')
 
-  await findOrCreateHostTheme(adminSession)
   await initializeFSWatcher()
   await startThemeAppExtensionDevelopmentServer()
 }
@@ -54,14 +53,16 @@ export async function setupPreviewThemeAppExtensionsProcess({
 
   const adminSession = await ensureAuthenticatedAdmin(storeFqdn)
 
+  const themeId = theme ? theme : (await findOrCreateHostTheme(adminSession)).id.toString()
+
   return {
     type: 'theme-app-extensions',
     prefix: 'theme-extensions',
     function: runThemeAppExtensionsServerNext,
     options: {
       adminSession,
       developerPlatformClient,
-      theme,
+      themeId,
       themeExtensionPort,
     },
   }