fix: revert #5601 #6025, don't resolve rollupOptions.input

[patak-dev]

Description

fix #6576

In Vite@2.7 we merged #5601 resolving the paths in rollupOptions.input. This was done to fix path issues in Windows that are not clear enough from the issue. See unocss/unocss#88 (the issue there no longer seems relevant to unocss as the playground no longer uses rollupOptions.input in its vite config)

The added resolve was the basic one we use for lib mode entry, and doesn't take into account virtual paths or paths to dependencies that are valid inputs in rollup. See for example https://rollupjs.org/guide/en/#a-simple-example

This PR adds a basic test case in one of the playgrounds, and reverts the change. We should do this in a minor in case someone in the ecosystem started to rely on the new resolved config.

Would you help us review and test this PR @sibbng @IanVS @ydcjeff @matthewp?

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What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

[sibbng]

We don't need to revert this changes: Source of problem is just unhandled use case and workaround is available: #6576 (comment)

[IanVS]

Thanks for the heads-up, @patak-dev. This should not be a problem for storybook-builder-vite.

[matthewp]

Looking at the code I think this will fix our issue. Thanks!

[ckvv]

@patak-dev
This update will often trigger the following error？

TypeError [ERR_INVALID_ARG_TYPE]: The "path" argument must be of type string. Received undefined

vite/packages/vite/src/node/build.ts

Lines 379 to 381 in e385346

	const resolve = (p: string) => path.resolve(config.root, p)
	const input = libOptions

If it's because my configuration file is not standardized, I think it should give a more friendly prompt?

Upgrading https://github.com/ckpack/v-ui-template dependency vite to 2.8.1 will trigger the bug

[patak-dev]

@ckvv would you open a new issue so we can properly track this? And PR welcome with the warning you are thinking of so we can discuss it looking at the change that would help others to understand the issue.