remove some unused stuff (#10299)

Co-authored-by: Rich Harris <[email protected]>

Author: Rich-Harris

packages/svelte/package.json

@@ -96,7 +96,8 @@
     "check:watch": "tsc --watch",
     "generate:version": "node ./scripts/generate-version.js",
     "generate:types": "node ./scripts/generate-types.js",
-    "prepublishOnly": "pnpm build"
+    "prepublishOnly": "pnpm build",
+    "knip": "knip"
   },
   "devDependencies": {
     "@jridgewell/trace-mapping": "^0.3.22",
@@ -108,6 +109,7 @@
     "@types/aria-query": "^5.0.4",
     "dts-buddy": "^0.4.4",
     "esbuild": "^0.19.11",
+    "knip": "^4.2.1",
     "rollup": "^4.9.5",
     "source-map": "^0.7.4",
     "tiny-glob": "^0.2.9"
@@ -126,5 +128,14 @@
     "locate-character": "^3.0.0",
     "magic-string": "^0.30.5",
     "zimmerframe": "^1.1.0"
+  },
+  "knip": {
+    "entry": [
+      "src/*/index.js",
+      "src/*/public.d.ts"
+    ],
+    "project": [
+      "src/**"
+    ]
   }
 }