webpack.config.js

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

const isDevelopment = process.env.NODE_ENV === 'development';

module.exports = {
    mode: "production",
    entry: './src/index.tsx',

    // Enable sourcemaps for debugging webpack's output.
    devtool: "source-map",

    resolve: {
        // Add '.ts' and '.tsx' as resolvable extensions.
        extensions: [".ts", ".tsx", ".js", ".jsx", ".scss", ".css"]
    },

    module: {
        rules: [
            {
                test: /\.ts(x?)$/,
                exclude: /node_modules/,
                use: [
                    {
                        loader: "ts-loader"
                    }
                ]
            },
            // All output '.js' files will have any sourcemaps re-processed by 'source-map-loader'.
            {
                enforce: "pre",
                test: /\.js$/,
                loader: "source-map-loader"
            },
            {
                test: /\.module\.s(a|c)ss$/,
                loader: [
                    isDevelopment ? 'style-loader' : MiniCssExtractPlugin.loader,
                    {
                        loader: 'css-loader',
                        options: {
                            modules: true,
                            localIdentName: '[name]__[local]___[hash:base64:5]',
                            camelCase: true,
                            sourceMap: isDevelopment
                        }
                    },
                    {
                        loader: 'sass-loader',
                        options: {
                            sourceMap: isDevelopment
                        }
                    }
                ]
            },
            {
                test: /\.s(a|c)ss$/,
                exclude: /\.module.(s(a|c)ss)$/,
                loader: [
                    isDevelopment ? 'style-loader' : MiniCssExtractPlugin.loader,
                    'css-loader',
                    {
                        loader: 'sass-loader',
                        options: {
                            sourceMap: isDevelopment
                        }
                    }
                ]
            },
            {
                test:/\.css$/,
                use:['style-loader','css-loader']
            }           
        ]
    },

    // When importing a module whose path matches one of the following, just
    // assume a corresponding global variable exists and use that instead.
    // This is important because it allows us to avoid bundling all of our
    // dependencies, which allows browsers to cache those libraries between builds.
    externals: {
        "react": "React",
        "react-dom": "ReactDOM"
    },

    plugins: [
        new MiniCssExtractPlugin({
            filename: isDevelopment ? '[name].css' : '[name].[hash].css',
            chunkFilename: isDevelopment ? '[id].css' : '[id].[hash].css'
        })
    ],

    output: {
        filename: 'dxf-viewer-lib.js',        
        libraryTarget: 'umd'     
    },
    // optimization: {
    //     minimizer: [new UglifyJsPlugin()]
    // }
};