skypack fails on code with private fields

[trusktr]

Reproduction:

import('https://cdn.skypack.dev/lume/dist/index.js').then(console.log)

Error:

[Package Error] "[email protected]" could not be built. 
[1/5] Verifying package is valid…
[2/5] Installing dependencies from npm…
[3/5] Building package using esinstall…
Running esinstall...
Failed to load node_modules/lume/dist/core/ChildTracker.js
  Unexpected token (24:8) in lume/dist/core/ChildTracker.js
Install failed.
Install failed.

The reason is #private syntax.

Skypack needs a tooling update.

I wish we had a vanilla ESM server that would never break on syntax.