posthog/frontend/webpack.config.js

const path = require('path');
const MiniCssExtractPlugin = require("mini-css-extract-plugin");

module.exports = {
    mode: process.env.NODE_ENV === 'production' ? 'production' : 'development',
    entry: './src/index.js',
    output: {
        path: path.resolve(__dirname, 'dist'),
        filename: 'posthog.bundle.js'
    },
    module: {
        rules: [
            {
                test: /\.js$/,
                exclude: /(node_modules)/,
                use: {
                    loader: 'babel-loader'
                }
            },
            {
                // Apply rule for .sass, .scss or .css files
                test: /\.(sa|sc|c)ss$/,

                // Set loaders to transform files.
                // Loaders are applying from right to left(!)
                // The first loader will be applied after others
                use: [
                    {
                        // After all CSS loaders we use plugin to do his work.
                        // It gets all transformed CSS and extracts it into separate
                        // single bundled file
                        loader: MiniCssExtractPlugin.loader
                    },
                    {
                        // This loader resolves url() and @imports inside CSS
                        loader: "css-loader",
                    },
                    {
                        // Then we apply postCSS fixes like autoprefixer and minifying
                        loader: "postcss-loader"
                    },
                    {
                        // First we transform SASS to standard CSS
                        loader: "sass-loader",
                        options: {
                            implementation: require("sass")
                        }
                    }
                ]
            },
            {
                // Now we apply rule for images
                test: /\.(png|jpe?g|gif|svg)$/,
                use: [
                    {
                        // Using file-loader for these files
                        loader: "file-loader",

                        // In options we can set different things like format
                        // and directory to save
                        options: {
                            outputPath: 'images'
                        }
                    }
                ]
            },
            {
                // Apply rule for fonts files
                test: /\.(woff|woff2|ttf|otf|eot)$/,
                use: [
                    {
                        // Using file-loader too
                        loader: "file-loader",
                        options: {
                            outputPath: 'fonts'
                        }
                    }
                ]
            }
        ]
    },
    plugins: [
        new MiniCssExtractPlugin({
            filename: "bundle.css"
        })
    ]
};