diff --git a/.circleci/config.yml b/.circleci/config.yml
index 18ad245f250b..0708f3aec02f 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -257,7 +257,7 @@ jobs:
   #   executor:
   #     class: large
   #     name: sb_cypress_8_node_14
-  #   parallelism: 2
+  #   parallelism: 8
   #   steps:
   #     - git-shallow-clone/checkout_advanced:
   #         clone_options: '--depth 1 --verbose'
@@ -462,7 +462,7 @@ jobs:
     executor:
       class: medium+
       name: sb_node_14_browsers
-    parallelism: 2
+    parallelism: 8
     steps:
       - git-shallow-clone/checkout_advanced:
           clone_options: '--depth 1 --verbose'
@@ -482,7 +482,7 @@ jobs:
     executor:
       class: medium+
       name: sb_node_14_browsers
-    parallelism: 2
+    parallelism: 8
     steps:
       - git-shallow-clone/checkout_advanced:
           clone_options: '--depth 1 --verbose'
@@ -498,7 +498,7 @@ jobs:
     executor:
       class: medium+
       name: sb_node_14_browsers
-    parallelism: 2
+    parallelism: 8
     steps:
       - git-shallow-clone/checkout_advanced:
           clone_options: '--depth 1 --verbose'
@@ -518,7 +518,7 @@ jobs:
     executor:
       class: medium+
       name: sb_node_14_browsers
-    parallelism: 2
+    parallelism: 8
     steps:
       - git-shallow-clone/checkout_advanced:
           clone_options: '--depth 1 --verbose'
@@ -534,7 +534,7 @@ jobs:
     executor:
       class: medium+
       name: sb_node_14_browsers
-    parallelism: 2
+    parallelism: 8
     steps:
       - git-shallow-clone/checkout_advanced:
           clone_options: '--depth 1 --verbose'
@@ -549,7 +549,7 @@ jobs:
   e2e-sandboxes:
     docker:
       - image: mcr.microsoft.com/playwright:v1.24.0-focal
-    parallelism: 2
+    parallelism: 8
     steps:
       - git-shallow-clone/checkout_advanced:
           clone_options: '--depth 1 --verbose'
diff --git a/code/.eslintrc.js b/code/.eslintrc.js
index 1129908e7eb0..0e590a380807 100644
--- a/code/.eslintrc.js
+++ b/code/.eslintrc.js
@@ -101,5 +101,11 @@ module.exports = {
         'jest/no-test-callback': 'off', // These aren't jest tests
       },
     },
+    {
+      files: ['**/builder-vite/input/iframe.html'],
+      rules: {
+        'no-undef': 'off', // ignore "window" undef errors
+      },
+    },
   ],
 };
diff --git a/code/lib/builder-vite/src/source-loader-plugin.ts b/code/lib/builder-vite/src/source-loader-plugin.ts
index 65d5a4d2682a..2192653c9097 100644
--- a/code/lib/builder-vite/src/source-loader-plugin.ts
+++ b/code/lib/builder-vite/src/source-loader-plugin.ts
@@ -1,13 +1,17 @@
 import type { Plugin } from 'vite';
 import sourceLoaderTransform from '@storybook/source-loader';
-import type { ExtendedOptions } from './types';
 import MagicString from 'magic-string';
+import type { ExtendedOptions } from './types';
 
 const storyPattern = /\.stories\.[jt]sx?$/;
 const storySourcePattern = /var __STORY__ = "(.*)"/;
 const storySourceReplacement = '--STORY_SOURCE_REPLACEMENT--';
 
-const mockClassLoader = (id: string) => ({ emitWarning: (message: string) => console.warn(message), resourcePath: id });
+const mockClassLoader = (id: string) => ({
+  // eslint-disable-next-line no-console
+  emitWarning: (message: string) => console.warn(message),
+  resourcePath: id,
+});
 
 // HACK: Until we can support only node 15+ and use string.prototype.replaceAll
 const replaceAll = (str: string, search: string, replacement: string) => {
@@ -31,6 +35,7 @@ export function sourceLoaderPlugin(config: ExtendedOptions): Plugin | Plugin[] {
             map: s.generateMap({ hires: true, source: id }),
           };
         }
+        return undefined;
       },
     };
   }
@@ -66,6 +71,7 @@ export function sourceLoaderPlugin(config: ExtendedOptions): Plugin | Plugin[] {
             map: s.generateMap(),
           };
         }
+        return undefined;
       },
     },
     {
@@ -90,6 +96,7 @@ export function sourceLoaderPlugin(config: ExtendedOptions): Plugin | Plugin[] {
             map: s.generateMap(),
           };
         }
+        return undefined;
       },
     },
   ];
diff --git a/code/lib/core-server/src/build-dev.ts b/code/lib/core-server/src/build-dev.ts
index 365dafb9a734..ff25cd76112b 100644
--- a/code/lib/core-server/src/build-dev.ts
+++ b/code/lib/core-server/src/build-dev.ts
@@ -119,7 +119,7 @@ export async function buildDevStandalone(options: CLIOptions & LoadOptions & Bui
   if (options.smokeTest) {
     const warnings: Error[] = [];
     warnings.push(...((managerStats && managerStats.toJson().warnings) || []));
-    warnings.push(...((managerStats && previewStats.toJson().warnings) || []));
+    warnings.push(...((previewStats && previewStats.toJson().warnings) || []));
 
     const problems = warnings
       .filter((warning) => !warning.message.includes(`export 'useInsertionEffect'`))
@@ -128,6 +128,7 @@ export async function buildDevStandalone(options: CLIOptions & LoadOptions & Bui
         (warning) => !warning.message.includes(`Conflicting values for 'process.env.NODE_ENV'`)
       );
 
+    // eslint-disable-next-line no-console
     console.log(problems.map((p) => p.stack));
     process.exit(problems.length > 0 ? 1 : 0);
     return;
diff --git a/code/package.json b/code/package.json
index 599c5232472e..ae2200157639 100644
--- a/code/package.json
+++ b/code/package.json
@@ -191,6 +191,7 @@
     "@storybook/codemod": "workspace:*",
     "@storybook/components": "workspace:*",
     "@storybook/core-events": "workspace:*",
+    "@storybook/core-vite": "workspace:*",
     "@storybook/core-webpack": "workspace:*",
     "@storybook/csf-tools": "workspace:*",
     "@storybook/docs-tools": "workspace:*",
diff --git a/scripts/build-package.js b/scripts/build-package.js
index 70468be2e0ea..f9df57b1f7c2 100644
--- a/scripts/build-package.js
+++ b/scripts/build-package.js
@@ -113,7 +113,7 @@ async function run() {
   }
 
   selection?.filter(Boolean).forEach(async (v) => {
-    const commmand = (await readJSON(resolve(v.location, 'package.json'))).scripts.prep;
+    const commmand = (await readJSON(resolve(v.location, 'package.json'))).scripts.prepare;
     const cwd = resolve(__dirname, '..', 'code', v.location);
     const sub = require('execa').command(
       `${commmand}${watchMode ? ' --watch' : ''}${prodMode ? ' --optimized' : ''}`,