Plugin is incompatible with Storybook using Vite@2.9.7

[troyvassalotti]

With vite's update to v2.9.7, the plugin's default settings no longer work when used in conjunction with @storybook/builder-vite.

A minimal reproducible example can be found here: https://github.com/troyvassalotti/storybook-vite-plugin-mre with steps on how to reproduce and the error that is happening.

It seems that Vite may have changed how CSS imports work and it is creating an issue when trying to run a Storybook dev server. This issue is related to #49. In order for the plugin to work with Storybook so we can import SASS into our Lit components, we need to specifically include only SASS files. We lose the option to include standard CSS files after the Vite update.

[IanVS]

I've been digging into why our example lit project has started failing in the storybook builder when updating vite to v3.

One thing I've noticed so far, is that the code from vite now looks like this:

export default /* #__PURE__ */ (() => "p{color:#00f}\n")()

Which might not be what this plugin is expecting. Here's the node structure:

Node {
  type: 'ExportDefaultDeclaration',
  start: 0,
  end: 58,
  declaration: <ref *1> Node {
    type: 'CallExpression',
    start: 31,
    end: 58,
    callee: Node {
      type: 'ArrowFunctionExpression',
      start: 32,
      end: 55,
      id: null,
      expression: true,
      generator: false,
      async: false,
      params: [],
      body: [Node],
      parent: [Circular *1],
      edit: [Helpers],
      getSource: [Function: bound source],
      update: [Function: bound update],
      source: [Function: bound source],
      append: [Function: bound append],
      prepend: [Function: bound prepend]
    },
    arguments: [],
    optional: false,
    _rollupAnnotations: [ [Object] ],
    parent: [Circular *2],
    edit: Helpers { node: [Circular *1], string: {} },
    getSource: [Function: bound source],
    update: [Function: bound update],
    source: [Function: bound source],
    append: [Function: bound append],
    prepend: [Function: bound prepend]
  },

But, this plugin is looking for a node.declaration.name and node.declaration.type === 'Literal'

[bluwy]

It's likely caused by vitejs/vite#8278 (Vite 3) and vitejs/vite#8471 (Vite 2 backport). I'm not sure if the plugin is tapping into Vite's internals to be a regression, but the PRs were improvements to reduce hacks made in the codebase.

[umbopepato]

Thanks for investigating @IanVS! I'll try and handle that AST format as well.
What surprises me is that in @troyvassalotti's example the css code is sent to the plugin as raw unprocessed text...

[bluwy]

Note The linked PRs has been reverted due to other regressions caused. See vitejs/vite#8874

[jrencz]

Just for the record: adjusting default include pattern solved the problem for me

rollup-plugin-postcss-lit/index.ts

Line 32 in 303e1b0

include: '**/*.{css,sss,pcss,styl,stylus,sass,scss,less}',

include: '**/*.{css,sss,pcss,styl,stylus,sass,scss,less}?(*)'

Maybe a way to go would be to introduce an option allowing to match without query (and use it by default)

[umbopepato]

Cool @jrencz, let's change the default include to that one then. Feel free to to open a PR if you want!
As for the additional option, I'd say changing the include option directly should be enough, no?

[jrencz]

It should, but what I meant was: instead of matching whole id, let's instead extract the path out of it and filter the paths. That would make it impossible to match query if one wanted to, as one can now

Additional flag/option would allow users to revert to the native way (i.e. with query) if needed.

[umbopepato]

Is anyone still experiencing this problem? I cannot reproduce it with recent versions of vite and @storybook/builder-vite. Anyway, just to be sure, I added support for template literals and iife expressions (and combinations of those) in v2.1.0

[sr258]

@umbopepato I've recently had the issue when using Storybook 7.4 and rollup-plugin-postcss-lit 2.0.0. I've updated to Storybook 7.5 and rollup-plugin-postcss-lit 2.1.0 and the issue has disappeared! Thanks for fixing it!