redundant files in build directory after bundling

It looks like the bundling step from @snowpack/plugin-parcel doesn't do any kind of cleanup after bundling, so the build directory ends up containing the bundled/fingerprinted assets and the original output from snowpack build.

I think it'd make more sense to file this issue wherever that plugin code lives, but I can't find the repo!

{
  "scripts": {
    "mount:public": "mount public --to /",
    "mount:src": "mount src --to /_dist_"
  },
  "plugins": [
    "@snowpack/plugin-parcel"
  ]
}

Produces something like:

src/
  index.js      # original source
build/
  web_modules/
  _dist_/
    index.js           # this is the index.js with rewritten web_modules paths
  _dist_.a45130ae.js   # this is the bundled file

After bundling, I want to deploy the build dir, but I don't really want to deploy build/web_modules or build/_dist_ because they aren't going to be used.

Ideally the bundling plugins would output the bundled version to a separate directory (I think Parcel already does this with a .build directory) then clean build and copy the contents across.