Upgrade Svelte version to v4

[willdhorn]

Currently, svelte projects are initialized using v3.55.1, despite v4 having been released last year

[willdhorn]

This is the diff of running npx svelte-migrate@latest svelte-4 (as per the migration guide)

   "devDependencies": {
-    "@sveltejs/vite-plugin-svelte": "^2.0.3",
+    "@sveltejs/vite-plugin-svelte": "^2.4.1",
     "@tsconfig/svelte": "^3.0.0",
     "@types/webextension-polyfill": "^0.10.0",
-    "svelte": "^3.55.1",
-    "svelte-check": "^2.10.3",
+    "svelte": "^4.0.0",
+    "svelte-check": "^3.4.3",
     "tslib": "^2.5.0",
     "typescript": "^5.3.2",
     "vite": "^4.0.0",
     "vite-plugin-web-extension": "^4.0.0",
     "webextension-polyfill": "^0.10.0"
   }

[nileshtrivedi]

+1

I created a new web extension project and was surprised that it was configured with Svelte 3.55 and Vite 4.0.

[nileshtrivedi]

I submitted a PR #200 for this. Please let me know if any other changes are needed to make this complete and ready to merge.

[aklinker1]

Nope, just getting the updated code to the main branch will make it available in the starter kit immediately! Thanks