How to use css #import in rollup? - css

Question

I try to create a simple rollup app's config and have some troubles with css.
This is my css file:
#import "normalize.css";
#import "typeface-roboto";
html, body, #root {
height: 100%;
font-family: Roboto, serif;
}
body {
background: url('./images/background.jpg');
}
And all what i have is 3 errors about not found resources.
This is my config file:
import resolve from 'rollup-plugin-node-resolve'
import commonjs from 'rollup-plugin-commonjs'
import babel from 'rollup-plugin-babel'
import replace from 'rollup-plugin-replace'
import postcss from 'rollup-plugin-postcss'
import html from 'rollup-plugin-fill-html'
import url from "rollup-plugin-url"
process.env.NODE_ENV = 'development'
const CWD = process.cwd()
const Paths = {
SRC: `${CWD}/src`,
DIST: `${CWD}/dist-rollup`,
NODE_MODULES: `${CWD}/node_modules`
}
Object.assign(Paths, {
INPUT: Paths.SRC + '/index.js',
OUTPUT: Paths.DIST + '/index.js'
})
export default {
input: Paths.INPUT,
output: {
file: Paths.OUTPUT,
format: 'iife', // immediately-invoked function expression — suitable for <script> tags
// sourcemap: true
},
plugins: [
html({
template: `${Paths.SRC}/template.html`,
filename: 'index.html'
}),
postcss({
modules: true,
plugins: [
]
}),
url({
limit: 10 * 1024, // inline files < 10k, copy files > 10k
}),
resolve(), // tells Rollup how to find date-fns in node_modules
babel({
exclude: 'node_modules/**'
}),
commonjs(), // converts date-fns to ES modules
replace({ 'process.env.NODE_ENV': JSON.stringify('development') })
]
}
I was tried to use some plugins like rollup-plugin-rebase and postcss-assets, but unfortunately, it did not help me.

Answer 1

Maybe i chose not common way, but single working solution for me is use postcss with 2 plugins: postcss-imports for #import syntax and postcss-url for url.
But there were difficulties too.
Postcss-url don't want just work, like i expect.
I had to use 3 instance of this plugin:
[
postcssUrl(), // Find files' real paths.
postcssUrl({
url: 'copy',
basePath: 'src',
useHash: true,
assetsPath: 'dist'
}), // Copy to required destination.
postcssUrl({
url (asset) {
const rebasedUrl = `dist/${path.basename(asset.absolutePath)}`
return `${rebasedUrl}${asset.search}${asset.hash}`
}
}) // Fix final paths.
]
You may see it in complex on https://github.com/pashaigood/bundlers-comparison
And of course, i will be glad to see more simple solution if you know that, please, share with me.

Answer 2

I've found css-import to work well, the NPM package provides a cssimport command line interface that accepts a main CSS file which includes #import statements and an optional list of directory in which to search for the CSS; it outputs to stdout the merged CSS which can be written to a single file.
I use the following to output a single main.css file in my build directory, searching for imported files under node_modules:
cssimport main.css ./node_modules/ > ./build/main.css
When using rollup you can use the rollup-plugin-execute plugin to execute a shell command as part of rollup's build process. For example:
plugins: [
...
execute('npx cssimport main.css ./node_modules/ > build/main.css')
]