It looks like something needs to be updated in the package.json to support ES modules,
An unhandled error occured: TypeError: Cannot read properties of undefined (reading 'defineAction')
I've also tried importing the .es file directly but that gave me a different error:
solid-command-palette doesn't appear to be written in CJS, but also doesn't appear to be a valid ES module (i.e. it doesn't have "type": "module" or an .mjs extension for the entry point). Please contact the package author to fix.
Package subpath 'undefined' is not defined by "exports"
It looks like this package hasn't been updated in over a year, is it still being maintained?