fix(css): only use files the current bundle contains

[susnux]

Description

If using multiple output formats like es and cjs and running vite in watch mode, then generateBundle will be called once per output format. The bundle on each call only contains the files for the current output format, but our pureCSSChunks contain all files (from all output formats). So we need to filter the chunk list to only contain valid files, as otherwise basename will fail with:

The "path" argument must be of type string. Received undefined

Output when adding console output:

// console.warn(pureCssChunkNames)
[
  'chunks/NcMentionBubble.vue_vue_type_style_index_0_scoped_791c3b28_lang-D4yLtEdw.mjs',
  'chunks/NcRichText.vue_vue_type_style_index_0_scoped_6233f030_lang-CHHaElsZ.mjs',
  undefined,
  undefined
]
// console.warn([...pureCssChunks].map(c => c.fileName))
[
  'chunks/NcMentionBubble.vue_vue_type_style_index_0_scoped_791c3b28_lang-!~{00R}~.mjs',
  'chunks/NcRichText.vue_vue_type_style_index_0_scoped_6233f030_lang-!~{019}~.mjs',
  'chunks/NcMentionBubble.vue_vue_type_style_index_0_scoped_791c3b28_lang-!~{00R}~.cjs',
  'chunks/NcRichText.vue_vue_type_style_index_0_scoped_6233f030_lang-!~{019}~.cjs'
]
// Now the build fails with:
// [vite:css-post] The "path" argument must be of type string. Received undefined

// Here the second run for cjs is now running
// console.warn(pureCssChunkNames)
[
  undefined,
  undefined,
  'chunks/NcMentionBubble.vue_vue_type_style_index_0_scoped_791c3b28_lang-TWgAPFkJ.cjs',
  'chunks/NcRichText.vue_vue_type_style_index_0_scoped_6233f030_lang-D6wotsd_.cjs'
]
// console.warn([...pureCssChunks].map(c => c.fileName))
[
  'chunks/NcMentionBubble.vue_vue_type_style_index_0_scoped_791c3b28_lang-!~{00R}~.mjs',
  'chunks/NcRichText.vue_vue_type_style_index_0_scoped_6233f030_lang-!~{019}~.mjs',
  'chunks/NcMentionBubble.vue_vue_type_style_index_0_scoped_791c3b28_lang-!~{00R}~.cjs',
  'chunks/NcRichText.vue_vue_type_style_index_0_scoped_6233f030_lang-!~{019}~.cjs'
]

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[bluwy]

Good catch!