Make Vue compiler in @snowpack/plugin-vue configurable

[sebastiandittrich]

Changes

This PR adds the possibility to configure the vue compiler in @snowpack/plugin-vue.

Before:

// snowpack.config.mjs
export default {
  plugins: [
    ['@snowpack/plugin-vue', { /* No possibility to pass configuration options to the vue compiler */ }]
  ]
}

After:

// snowpack.config.mjs
export default {
  plugins: [
    ['@snowpack/plugin-vue', { compilerOptions: { isCustomElement: (tag) => tag.startsWith('lit-') } }]
  ]
}

Testing

This change was tested locally in my existing setup. It worked, and should not be breaking anything else, since it's just one line of code added, without side effects.

Docs

plugins/plugin-vue/README.md was updated accordingly.

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Latest commit: 6e58a93

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