The @vue/devtools-kit is now bundled, see https://bundlephobia.com/package/[email protected]

It seems like the dev tools api do not have (anymore) the sideEffects: false. You can patch this locally with pnpm patch. This is the diff that you can apply to a new file patches/@vue__devtools-api.patch

diff --git a/package.json b/package.json
index ef230c427bf5c2b7591d3de6cbf1c579504afad7..a41361dd13874c593878f477acf5ecf432b73f4a 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,7 @@
 {
   "name": "@vue/devtools-api",
   "type": "module",
+  "sideEffects": false,
   "version": "7.7.1",
   "author": "webfansplz",
   "license": "MIT",

Then in your package.json, add

 "pnpm": {                                                                                                                            
   "patchedDependencies": {                                                                                                           
     "@vue/devtools-api": "patches/@vue__devtools-api.patch"                                                                          
   }                                                                                                                                  
 }

If you don't use pnpm, you can use something like https://www.npmjs.com/package/patch-package or you can stick to v2 as this new release does not contain new changes.

The fix got merged at vuejs/devtools#795 so it shouldn't be too long until a new version is released. Then, I will be able to bump the dependency in pinia and publish a new version.

7.7.2 is now out with the change: https://github.com/vuejs/devtools/releases/tag/v7.7.2