Emits "You did not set any plugins, parser, or stringifier. Right now, PostCSS does nothing..." warning if scss entrypoint are passed to Webpack config

[bitfella]

Hello, postcss-crititical-css emits the following annoying console warning several times:

40% building 5/7 modules 2 active ...s\sass-loader\dist\cjs.js!C:\Migu\postcss-critical-css-test-master\src\module.scssYou did not set any plugins, parser, or stringifier. Right now, PostCSS does nothing. Pick plugins for your case on https://www.postcss.parts/ and use them in postcss.config.js.
40% building 7/8 modules 1 active ...s\sass-loader\dist\cjs.js!C:\Migu\postcss-critical-css-test-master\src\module.scssYou did not set any plugins, parser, or stringifier. Right now, PostCSS does nothing. Pick plugins for your case on https://www.postcss.parts/ and use them in postcss.config.js.

when scss (and css as well) entrypoints are passed to Webpack configuration object.
This happens when js entrypoints import css/scss files in which @critical rules are called.

Example:

module.exports = () => {
    return {
        entry: {
            main: path.join(__dirname, 'src', 'main.js'),
            site: path.join(__dirname, 'src', 'site.scss')
        },
        ...
    }
}

In this case, main.js imports main.scss that carries a @critical rule, while site.scss may or may not carry @critical rules (both ways will emit warnings).

Unfortunately I can't transform scss entrypoints into js ones and there's no way of silence warnings even playing with Webpack's stats options.

Thanks

[zgreen]

Thanks for the report, I'll take a look.

[timjuedemann]

I am encountering the same problem when running postcss-critical-css from within a CodeKit hook using postcss-cli.

I am importing scss files which are then compiled to a single css file using CodeKit’s libsass compiler. Said css file then serves as the entrypoint for my PostCSS plugin chain. However, any imported scss file carrying a @critical rule will result in the console warning mentioned by the OP. It’s worth noting that despite the warning everything compiles correctly.