build: add "sideEffects": false to package.json

Author: pi0

package.json

@@ -11,6 +11,7 @@
   ],
   "repository": "unjs/hookable",
   "license": "MIT",
+  "sideEffects": false,
   "type": "module",
   "exports": {
     ".": "./dist/index.mjs"
@@ -21,20 +22,21 @@
     "dist"
   ],
   "scripts": {
+    "benchmark": "vitest bench",
     "build": "obuild src/index.ts",
     "dev": "vitest",
     "lint": "eslint --cache . && prettier -c src test",
     "lint:fix": "eslint --cache . --fix && prettier -c src test -w",
     "prepublish": "pnpm build",
     "release": "pnpm test && pnpm build && changelogen --release --push && pnpm publish",
     "test": "pnpm lint && vitest run --coverage",
-    "test:types": "tsc --noEmit",
-    "benchmark": "vitest bench"
+    "test:types": "tsc --noEmit"
   },
   "devDependencies": {
     "@types/node": "^24.9.1",
     "@vitest/coverage-v8": "^4.0.3",
     "changelogen": "^0.6.2",
+    "esbuild": "^0.25.11",
     "eslint": "^9.38.0",
     "eslint-config-unjs": "^0.5.0",
     "expect-type": "^1.2.2",