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postcss.config.mjs
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postcss.config.mjs
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import postcssPresetEnv from 'postcss-preset-env'
import postcssSize from 'postcss-size'
import cssNano from 'cssnano'
/** @type {import('postcss-preset-env').pluginOptions} */
const postcssPresetEnvOptions = {
stage: 0,
// https://github.com/csstools/postcss-plugins/blob/main/plugin-packs/postcss-preset-env/FEATURES.md
features: {
// https://github.com/maximkoretskiy/postcss-initial
'all-property': false,
// https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-color-functional-notation
'color-functional-notation': false,
// https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-nested-calc#options
'nested-calc': { preserve: false },
// https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-nesting
'nesting-rules': true,
/**
* https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-nesting
*
* `2024-02` is the other possible value, but it makes some nesting
* behaviours cumbersome like, `.yo { &, &::before }`, unallowed
* by specification:
* https://www.w3.org/TR/css-nesting-1/#example-7145ff1e
*/
'nesting-rules': { edition: '2021' }
},
}
export default ({ options, env }) => ({
/**
* The SCSS parser is used to allow inline comments in CSS files and to avoid
* crashes on some unknown keywords like `@container`.
*/
parser: 'postcss-scss',
plugins: [
postcssSize(),
postcssPresetEnv(postcssPresetEnvOptions),
env === 'production' ? cssNano() : false,
],
})