Webpack 4 - Style-loader/url not working - css

Question

I'm having my webpack set up and it's running all fine, but in development it is serving my compiled scss stylesheets inline instead of using an URL.
module: {
rules: [
{
test: /\.scss$/,
use: [
{ loader: "style-loader"},
{ loader: "css-loader" },
{ loader: 'postcss-loader',
options: {
plugins: () => [require('autoprefixer')]
}
},
{ loader: "sass-loader" }
]
}
]
}
So I grabbed the docs and read up on how to use a single CSS file instead. I updated my webpack config to the following and since all loaders are running in reverse order this should be working;
module: {
rules: [
{
test: /\.scss$/,
use: [
{ loader: "style-loader/url"},
{ loader: "file-loader" },
{ loader: "css-loader" },
{ loader: 'postcss-loader',
options: {
plugins: () => [require('autoprefixer')]
}
},
{ loader: "sass-loader" }
]
}
]
}
It results in no errors, and inserts the following stylesheet into my header;
<link rel="stylesheet" type="text/css" href="6bbafb3b6c677b38556511efc7391506.scss">
As you can see it's creating an scss file, whereas I was expecting a .css file. I tried moving the file-loader around but that didn't work either and resulted in several crashes. Any idea how to turn this into a working css file?
I can't use mini-css-extract in my dev env since I'm using HMR. I already got this working on my prod env.
Update: When removing css-loader it compiles and shows my css applied to the page. But when I inspect the elements everything is on line 1 and the file it refers to can not be found
I'm importing my css like this in index.js by the way;
import '../css/styles.scss';

Answer 1

You can install extract-text-webpack-plugin for webpack 4 using:
npm i -D extract-text-webpack-plugin#next
The you can define the following constants:
// Configuring PostCSS loader
const postcssLoader = {
loader: 'postcss-loader',
options: {
ident: 'postcss',
plugins: [
// Write future-proof CSS and forget old preprocessor specific syntax.
// It transforms CSS specs into more compatible CSS so you don’t need to wait for browser support.
require('postcss-preset-env')()
]
}
};
// Configuring CSS loader
const cssloader = {
loader: 'css-loader',
options: {
importLoaders: 1
}
};
Then in your SASS loader section, you can use the following:
ExtractTextPlugin.extract({
use: [cssloader, postcssLoader, 'sass-loader']
})
Then in you plugins section, you need to use the following:
new ExtractTextPlugin({
filename: 'css/[name].css'
)
Now suppose that your entry section is like below:
entry: {
app: 'index.js'
}
The generated CSS will be named as app.css and placed inside the css folder.
Another useful plugins for handling these type of post creating operations are:
HtmlWebpackPlugin and HtmlWebpackIncludeAssetsPlugin
Working with these plugins along with extract-text-webpack-plugin gives you a lot of flexibility.

Answer 2

I had a similar issue with webpack, after searching for a long time i found the soluton of combining a few plugins:
This is my result config: (as a bonus it preserves your sass sourcemaps;))
watch: true,
mode: 'development',
devtool: 'source-map',
plugins: [
new MiniCssExtractPlugin({
filename: "[name].css", //make sure you use this format to prevent .scss extention in the hot reload file
chunkFilename: "[id].css"
})
],
module: {
rules: [
{
test: /\.scss$/,
use: [
'css-hot-loader', //5. this will hot load all the extracted css.
MiniCssExtractPlugin.loader, //4 this will extract all css
{
loader: "css-loader", //3. this is where the fun starts
options: {
sourceMap: true
}
},
{
loader: "postcss-loader", //2. add post css
options: {
sourceMap: true
}
},
{
loader: "sass-loader", //1 . you can ingore the globImporter
options: {
importer: globImporter(),
includePaths: ["node_modules"],
sourceMap: true
}
}
]
},
]
}