skypack fails on code with private fields

[trusktr]

Reproduction:

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

Error:

[Package Error] "lume@v0.3.0-alpha.28" 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.

[JohnRDOrazio]

I am getting the same error:
https://cdn.skypack.dev/error/build:@liturgical-calendar/components-js@v1.0.7-uYywXwHIoo39BxHXG1Tt

/*
 * [Package Error] "@liturgical-calendar/components-js@v1.0.7" 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/@liturgical-calendar/components-js/dist/CalendarSelect/CalendarSelect.js
 *     Unexpected token (272:4) in @liturgical-calendar/components-js/dist/CalendarSelect/CalendarSelect.js
 *   Install failed.
 *   Install failed.
 *
 * How to fix:
 *   - If you believe this to be an error in Skypack, file an issue here: https://github.com/skypackjs/skypack-cdn/issues
 *   - If you believe this to be an issue in the package, share this URL with the package authors to help them debug & fix.
 *   - Use https://skypack.dev/ to find a web-friendly alternative to find another package.
 */

console.warn("[Package Error] \"@liturgical-calendar/components-js@v1.0.7\" could not be built. \n[1/5] Verifying package is valid…\n[2/5] Installing dependencies from npm…\n[3/5] Building package using esinstall…\nRunning esinstall...\nFailed to load node_modules/@liturgical-calendar/components-js/dist/CalendarSelect/CalendarSelect.js\n  Unexpected token (272:4) in @liturgical-calendar/components-js/dist/CalendarSelect/CalendarSelect.js\nInstall failed.\nInstall failed.");
throw new Error("[Package Error] \"@liturgical-calendar/components-js@v1.0.7\" could not be built. ");
export default null;

Whereas jsdelivr does not pose a problem: https://cdn.jsdelivr.net/npm/@liturgical-calendar/components-js@1.0.7/+esm

[JohnRDOrazio]

related issues:

• [Package Error] "@eyalsh/async_channels@v1.0.0-beta2" could not be built.  #222
• Does skypack not support private class fields?  #308
• [Package Error] no support for the private instance methods #351
• [Package Error] "lru-cache@v9.1.1" could not be built. (Imported by "@octokit/auth-app"). #354
• Skypack is definitely unmaintained, newer code breaks Skypack. #362