Rollup.js building error with material-ui layout-grid component included - material-ui

Question

I integrated Material UI into my Svelte project with help of "Svelte Material UI" package.
But it don't contains Material layout-grid component.
I installed it separately using yarn add "#material/layout-grid" command.
But now I'm getting error during build process:
[!] (plugin postcss) Error: Invalid CSS after "...ch $size in map": expected expression (e.g. 1px, bold), was ".keys(variables.$co"
node_modules/#material/layout-grid/mdc-layout-grid.scss
Error: Invalid CSS after "...ch $size in map": expected expression (e.g. 1px, bold), was ".keys(variables.$co"
at options.error (/media/hdd-home/d/WebServers/home/spadmin.org/public_html/todoapp/node_modules/node-sass/lib/index.js:291:26)
So, I gave up resolving it myself.
The project package.json:
{
"name": "svelte-app",
"version": "1.0.0",
"scripts": {
"build": "rollup -c",
"dev": "rollup -c -w",
"start": "sirv ."
},
"devDependencies": {
"#mdi/js": "^5.3.45",
"#rollup/plugin-commonjs": "^12.0.0",
"#rollup/plugin-node-resolve": "^8.0.0",
"#smui/button": "^1.0.0-beta.21",
"#smui/card": "^1.0.0-beta.21",
"#smui/checkbox": "^1.0.0-beta.21",
"#smui/chips": "^1.0.0-beta.21",
"#smui/common": "^1.0.0-beta.21",
"#smui/form-field": "^1.0.0-beta.21",
"#smui/linear-progress": "^1.0.0-beta.21",
"#smui/textfield": "^1.0.0-beta.21",
"#smui/top-app-bar": "^1.0.0-beta.21",
"material": "^0.4.3",
"node-sass": "^4.14.1",
"rollup": "^2.3.4",
"rollup-plugin-copy": "^3.3.0",
"rollup-plugin-livereload": "^1.0.0",
"rollup-plugin-postcss": "^3.1.1",
"rollup-plugin-svelte": "^5.0.3",
"rollup-plugin-terser": "^5.1.2",
"svelte": "^3.0.0",
"svelte-preprocess": "^3.7.4"
},
"dependencies": {
"#material/layout-grid": "^6.0.0",
"sirv-cli": "^0.4.4"
}
}
And here is rollup.config.js
import svelte from 'rollup-plugin-svelte';
import resolve from '#rollup/plugin-node-resolve';
import commonjs from '#rollup/plugin-commonjs';
import copy from 'rollup-plugin-copy';
import livereload from 'rollup-plugin-livereload';
import {terser} from 'rollup-plugin-terser';
import postcss from 'rollup-plugin-postcss';
import autoPreprocess from 'svelte-preprocess';
const production = !process.env.ROLLUP_WATCH;
export default {
input: 'src/main.js',
output: {
sourcemap: true,
format: 'iife',
name: 'app',
file: 'scripts/app.js',
},
plugins: [
copy({
targets: [
{src: 'src/index.html', dest: '.'},
],
}),
svelte({
dev: !production,
emitCss: true,
css: css => {
css.write('css/app.css');
},
preprocess: autoPreprocess()
}),
resolve({
browser: true,
dedupe: ['svelte', '#material'],
}),
commonjs(),
postcss({
extract: 'css/app.css',
minimize: true,
sourceMap: true,
use: [
[
'sass', {
includePaths: [
'./theme',
'./node_modules',
],
},
],
],
}),
!production && serve(),
!production && livereload({watch: ['scripts', 'css', 'src', 'theme']}),
production && terser(),
],
watch: {
clearScreen: false,
},
};
function serve() {
let started = false;
return {
writeBundle() {
if (!started) {
started = true;
require('child_process').spawn('npm', ['run', 'start', '--', '--dev'], {
stdio: ['ignore', 'inherit', 'inherit'],
shell: true,
});
}
},
};
}

Answer 1

It clearly tries to parse the scss file as css. So it probably misses the compile step. I can't find the scss rollup plugin in your package.json.
Check this, it could solve your problem: https://www.npmjs.com/package/rollup-plugin-scss