Merge pull request #20804 from storybookjs/fix-sveltekit

Sveltekit: Ensure SSR is disabled

code/frameworks/sveltekit/src/plugins/config-overrides.ts

@@ -0,0 +1,15 @@
+import type { Plugin } from 'vite';
+
+export function configOverrides() {
+  return {
+    name: 'storybook:sveltekit-overrides',
+    config: (conf) => {
+      // Some versions of sveltekit set ssr, we need it to be false
+      if (conf.build?.ssr) {
+        // eslint-disable-next-line no-param-reassign
+        conf.build.ssr = false;
+      }
+      return conf;
+    },
+  } satisfies Plugin;
+}

code/frameworks/sveltekit/src/preset.ts

@@ -2,6 +2,7 @@
 import { viteFinal as svelteViteFinal } from '@storybook/svelte-vite/preset';
 import type { PresetProperty } from '@storybook/types';
 import { withoutVitePlugins } from '@storybook/builder-vite';
+import { configOverrides } from './plugins/config-overrides';
 import { type StorybookConfig } from './types';
 
 export const core: PresetProperty<'core', StorybookConfig> = {
@@ -16,10 +17,12 @@ export const viteFinal: NonNullable<StorybookConfig['viteFinal']> = async (confi
 
   // Remove vite-plugin-svelte-kit from plugins if using SvelteKit
   // see https://github.com/storybookjs/storybook/issues/19280#issuecomment-1281204341
-  plugins = await withoutVitePlugins(plugins, [
-    // @sveltejs/kit@1.0.0-next.587 and later
-    'vite-plugin-sveltekit-compile',
-  ]);
+  plugins = (
+    await withoutVitePlugins(plugins, [
+      // @sveltejs/kit@1.0.0-next.587 and later
+      'vite-plugin-sveltekit-compile',
+    ])
+  ).concat(configOverrides());
 
   return { ...baseConfig, plugins };
 };