Webpack style-loader / css-loader: url() path resolution not working

Question

There are a few SO posts about style-loader and css-loader, but despite this I have not been able to find a solution to my problem.

In short summary, when I @import css files in other css files, and the imported css contains url()s with relative paths, the paths are not resolved correctly.

Basically, the error message shows that Webpack ends up thinking the url() paths in the imported css are relative to src (main entry point), rather than being relative to the css file it it is imported into:

// css-one.scss
@import "./assets/open-iconic-master/font/css/open-iconic-bootstrap.css";

// open-iconic-bootstrap.css
@font-face {
    src: url('../fonts/open-iconic.eot');
}

Error:

ERROR in ./src/main.scss (./node_modules/css-loader??ref--5-1!./node_modules/postcss-loader/src??ref--5-2!./node_modules/sass-loader/lib/loader.js??ref--5-3!./src/main.scss)

Module not found: Error: Can't resolve '../fonts/open-iconic.eot' in 'C:\Users\...\src' @ ./src/main.scss (./node_modules/css-loader??ref--5-1!./node_modules/postcss-loader/src??ref--5-2!./node_modules/sass-loader/lib/loader.js??ref--5-3!./src/main.scss) 7:106-141 7:172-207 @ ./src/main.scss @ ./src/index.js

What I Have Tried:

• I have tried to use the convertToAbsoluteUrls flag in style-loader
• I have tried to turn off all source maps (mentioned in style-loader docs)

My Webpack Config File (loaders are at the bottom):

Answer 1

it took me around 5 days of work to understand how this webpack mess works. I have to be honest I can say that this is one of those things that I really do not understand why they are "defacto" tools of the moment. I can't understand how difficult it can be just to make the config files work as it should, in gulp took me 1 hour to do the same.

My problem was that all the url() rules (including fonts and images) were being loaded by css-loader as [object Module], and they where exported by file-loader but never loaded, so if I added ?url=false to the css-loader it never copied the files and export them. I have to say this was a totally PITA, but I got it working, and I hope it works for somebody else in the world, this was made with webpack 4.

const webpack = require("webpack");
const HtmlWebpackPlugin = require('html-webpack-plugin');
const MiniCssExtractPlugin = require("mini-css-extract-plugin");
const ImageminPlugin = require('imagemin-webpack-plugin').default;
const CopyPlugin = require('copy-webpack-plugin');
module.exports = {
    entry: "./src/index.js",
    mode: "development",
    module: {
        rules: [
        {
            test: /\.(js|jsx)$/,
            exclude: /(node_modules|bower_components)/,
            loader: "babel-loader",
            options: { presets: ["@babel/env"] }
        },
        {
            test: /\.(gif|png|jpe?g|svg)$/i,
            use: [
            {
                loader: 'image-webpack-loader',
                options: {
                    mozjpeg: {
                        progressive: true,
                        quality: 65
                    },

                    optipng: {
                        enabled: false,
                    },
                    pngquant: {
                        quality: [0.65, 0.90],
                        speed: 4
                    },
                    gifsicle: {
                        interlaced: false,
                    },

                    webp: {
                        quality: 75
                    },
                }
            },
            {
                loader: 'file-loader',
                options:{
                    name: '[name].[ext]',
                    outputPath: 'images/',
                    publicPath: 'images/'
                }
            },
            'url-loader?limit=100000'
            ],
        },
        {
            test: /\.(woff(2)?|ttf|eot)(\?v=\d+\.\d+\.\d+)?$/,
            use: [
            {
                loader: 'file-loader',
                options: {
                    name: '[name].[ext]',
                    outputPath: 'fonts/'
                }
            }
            ]
        },
        {
            test: /\.s[ac]ss$/i,
            use: [
            MiniCssExtractPlugin.loader,
            { loader: 'css-loader?url=false'},
            { loader: 'sass-loader', options: { sourceMap: true } }
            ],
        },
        ]
    },
    resolve: { extensions: ["*", ".js", ".jsx"] },
    output: {
        path: path.resolve(__dirname, "dist/"),
        publicPath: "",
        filename: "bundle.js"
    },
    devServer: {
        contentBase: path.join(__dirname, "dist/"),
        port: 3000,
        publicPath: "http://localhost:3000/dist/",
        hotOnly: true
    },
    plugins: [ new MiniCssExtractPlugin(),
    new CopyPlugin([{ from: 'src/images/', to: 'images/' }]),
    new CopyPlugin([{ from: 'src/fonts/', to: 'fonts/' }]),
    new ImageminPlugin({ test: /\.(jpe?g|png|gif|svg)$/i }),
    new HtmlWebpackPlugin({
        hash: true,
        template: './src/index.html',
            filename: './index.html' //relative to root of the application
        }),
    ]
};