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Svelte

How to Use

Rspack provides two solutions to support Svelte:

  • Use Rsbuild: Rsbuild provides out-of-the-box support for Svelte, allowing you to quickly create a Svelte project. See "Rsbuild - Svelte" for details.
  • Manually configure Rspack: You can refer to the current document to manually add configurations for Svelte.

Configure svelte-loader

Thanks to the good compatibility of Rspack with the svelte-loader, it is very easy to use Svelte in Rspack. All you need is to configure svelte-loader. Rspack provides Svelte example for reference.

rspack.config.js
const path = require('path');
/** @type {import('@rspack/cli').Configuration} */
const config = {
  context: __dirname,
  entry: {
    main: './src/main.ts',
  },
  resolve: {
    alias: {
      svelte: path.dirname(require.resolve('svelte/package.json')),
    },
    extensions: ['.mjs', '.js', '.ts', '.svelte'],
    mainFields: ['svelte', 'browser', 'module', 'main'],
  },
  module: {
    rules: [
      {
        test: /\.svelte$/,
        use: [
          {
            loader: 'svelte-loader',
            options: {
              compilerOptions: {
                dev: !prod,
              },

              emitCss: prod,
              hotReload: !prod,
              preprocess: sveltePreprocess({ sourceMap: !prod, postcss: true }),
            },
          },
        ],
      },
    ],
  },
};
module.exports = config;