Source Mapping

It is recommended to enable SourceMap for production environments to facilitate debugging in production environments. If you have a large project, it is recommended that you choose a configuration with better performance (see devtool for more options), such as the source-map configuration option.


During the production build, Rspack uses the built-in minimizer to minify JavaScript and CSS code by default. You can use SwcJsMinimizerRspackPlugin for configuration.

const rspack = require('@rspack/core');

module.exports = {
  optimization: {
    minimizer: [
      new rspack.SwcJsMinimizerRspackPlugin({
        // JS minimizer configuration
      new rspack.SwcCssMinimizerRspackPlugin(),

If the built-in minimizer cannot meet your needs, you can also use optimization.minimizer to set custom minimizers.