Merge pull request #23472 from storybookjs/fix/improve-svelte-error

Svelte-vite: Improve error message when sveltekit plugins are found in non-sveltekit projects

code/frameworks/svelte-vite/src/utils.ts

@@ -25,17 +25,14 @@ export async function handleSvelteKit(plugins: PluginOption[], options: Options)
   ]);
 
   if (hasSvelteKitPlugins && framework !== '@storybook/sveltekit') {
-    logger.error(
-      dedent`
+    throw new Error(dedent`
       We've detected a SvelteKit project using the @storybook/svelte-vite framework, which is not supported in Storybook 7.0
       Please use the @storybook/sveltekit framework instead.
       You can migrate automatically by running
       
       npx storybook@latest automigrate
 
       See https://github.com/storybookjs/storybook/blob/next/MIGRATION.md#sveltekit-needs-the-storybooksveltekit-framework
-      `
-    );
-    throw new Error();
+    `);
   }
 }