Default exports not exported from lwc sub-packages

[nolanlawson]

(Follow-up to #3594 )

import plugin from '@lwc/rollup-plugin' // works
import plugin from 'lwc/rollup-plugin'  // throws Error due to no default export

I guess export * from 'foo' doesn't export default. We should add default exports to those packages that have htem.

[git2gus]

This issue has been linked to a new work item: W-13710298

[nolanlawson]

Well, there is a workaround:

import * as mod from 'lwc/rollup-plugin'
console.log(mod.default)

Also due to ESM-CJS interop, there is a weird effect anyway even if we do export the default, which is that you get

{ default: theThing }

...instead of just theThing.

Maybe we should just have a breaking change where we get rid of all our default exports. They always have weird compat issues anyway (e.g. with Jest).