JavaScript: Fix postbuild chmod to use numeric mode

fs.chmodSync does not accept shell-style string modes like '+x'. Use the numeric mode 0o755 instead.

Author: knutwannheden

rewrite-javascript/rewrite/package.json

@@ -47,7 +47,7 @@
   "scripts": {
     "prebuild": "bun -e \"require('fs').rmSync('dist',{recursive:true,force:true})\" && bun -e \"require('fs').rmSync('tsconfig.build.tsbuildinfo',{force:true})\"",
     "build": "tsc --build tsconfig.build.json",
-    "postbuild": "bun -e \"require('fs').chmodSync('dist/rpc/server.js', '+x')\" && npm link",
+    "postbuild": "bun -e \"require('fs').chmodSync('dist/rpc/server.js', 0o755)\" && npm link",
     "typecheck": "tsc --noEmit -p tsconfig.test.json",
     "dev": "tsc --watch -p tsconfig.json",
     "test": "npm run typecheck && npm run build && bun run testhelper",