Parcel bundler writes to package.json

[Agupane]

Hi, I'm trying to run parcel-bundler for node.js in a firebase cloud function, in which I don't have any write permissions, only the /tmp folder. The app is failing because parcel is trying to write to the package.json file without having permissions. It's this something expected, is a bug or can be configured in any way to avoid parcel to do this?

This is the error I got:
EROFS: read-only file system, open '/workspace/package.json

This is the bundler configuration:

    const options = {
      publicUrl: "",
      cache: false,
      outFile: "index.html",
      outDir: "/tmp/webflow/dist",
      watch: false,
      target: 'node',
      autoInstall: false,
      sourceMaps: false,
      bundleNodeModules: true
    };

try {
    const bundler = new Bundler("/tmp/webflow/zips/index.html", options);
    await bundler.bundle();
} catch(error){
  // `EROFS: read-only file system, open '/workspace/package.json`
}

Note: the same code runs perfectly well on local environment in which I have write permissions