Using PostCSS with @snowpack/plugin-build-script plugin logs error

When using the @snowpack/plugin-build-script plugin combined with the PostCSS CLI microsite dev stops and logs:

It looks like you're trying to use PostCSS!
Microsite will automatically use your configuration, but requires some 'devDependencies' to do so.

Please run 'npm install --save-dev @snowpack/plugin-postcss'

Relevant config/code:

snowpack.config.cjs

module.exports = {
  'plugins': [
    [
      '@snowpack/plugin-build-script',
      {'cmd': 'postcss', 'input': ['.css'], 'output': ['.css']},
    ],
  ],
};

package.json snippet:

"devDependencies": {
  "@snowpack/plugin-build-script": "^2.1.0",
  "postcss": "^8.2.5",
  "postcss-cli": "^8.3.1"
},
"postcss": {
  "plugins": {
    "tailwindcss": {}
  }
}

Wondering if there is a way to use the @snowpack/plugin-build-script plugin instead of using @snowpack/plugin-postcss, I really like the simplicity of the build script plugin more than a specific plugin for PostCSS if possible.

[natemoo-re]

Automatic PostCSS configuration has been removed in microsite@1.2.0!

[Siilwyn]

Yeah probably it’s for the config resolution, didn’t think of that!

Thought about the postcss integration some more, would prefer no predefined integration but instead setting it in the snowpack config as a plugin like done in Snowpack. Having it kind of integrated but not fully out of the box feels off to me…