PostCSS plugin does something with input CSS files.
.foo {
color: red;
}
.foo {
color: rgb(255, 0, 0);
}
Check you project for existed PostCSS config: postcss.config.js
in the project root, "postcss"
section in package.json
or postcss
in bundle config.
If you already use PostCSS, add the plugin to plugins list:
module.exports = {
plugins: [
+ require('postcss-first-plugin'),
require('autoprefixer')
]
}
If you do not use PostCSS, add it according to official docs and set this plugin in settings.