feat: implement html minifier

[stefanfrede]

Changes

Minify HTML output of @snowpack/plugin-webpack.

Testing

Tested locally.

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[update for 9ab1562 canceled]

[drwpow]

Awesome! I love this.

Happy to merge this, but would you mind adding an option to the webpack plugin to configure this behavior? That way someone can not only customize it, but also disable it if it gives them errors

plugins: [
  [
    "@snowpack/plugin-webpack",
    {
      htmlMinifierOptions: false // disabled entirely
    }
  ]
]

plugins: [
  [
    "@snowpack/plugin-webpack",
    {
      htmlMinifierOptions: {
        // custom options:
        collapseWhitespace: true,
        removeComments: true,
        removeEmptyAttributes: true,
        removeRedundantAttributes: true,
        removeScriptTypeAttributes: true,
        removeStyleLinkTypeAttributes: true,
      }
    }
  ]
]

Also be sure to add:

• default options (the ones you have already are fine)
• documentation to this plugin’s README.md

Edit: changed the example to allow for configuration as well as disabling

[gr2m]

Looks good, thanks 👍🏼

[drwpow]

Awesome! Thanks so much for listening to feedback. This is looking good—just have one question before we merge on whether this is still able to be disabled.