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Showing content from https://github.com/rspack-contrib/rspack-plugin-preact-refresh below:

rspack-contrib/rspack-plugin-preact-refresh: Preact refresh plugin for Rspack

Preact refresh plugin for Rspack.

First you need to install the dependencies:

npm add @rspack/plugin-preact-refresh @prefresh/core @prefresh/utils -D
# or
yarn add @rspack/plugin-preact-refresh @prefresh/core @prefresh/utils -D
# or
pnpm add @rspack/plugin-preact-refresh @prefresh/core @prefresh/utils -D
# or
bun add @rspack/plugin-preact-refresh @prefresh/core @prefresh/utils -D

The enabling of the Preact Refresh is divided into two parts: code injection and code transformation

• Code injection: injects code that interacts with @prefresh/core and @prefresh/utils, this is what this plugin does.
• Code transformation requires a loader
  • Use builtin:swc-loader or swc-loader
    • Enable jsc.transform.react.refresh to support common react transformation
    • Add @swc/plugin-prefresh into jsc.experimental.plugins to support the specific transformation of preact
  • Use babel-loader and add official babel plugin of prefresh.

In versions below 1.0.0, Rspack did not support preact refresh with swc-loader.

const PreactRefreshPlugin = require("@rspack/plugin-preact-refresh");
const isDev = process.env.NODE_ENV === "development";

module.exports = {
  // ...
  mode: isDev ? "development" : "production",
  module: {
    rules: [
      {
        test: /\.jsx$/,
        // exclude node_modules to avoid dependencies transformed by `@swc/plugin-prefresh`
        exclude: /node_modules/,
        use: {
          loader: "builtin:swc-loader",
          options: {
            jsc: {
              experimental: {
                plugins: [
                  [
                    // enable prefresh specific transformation
                    require.resolve("@swc/plugin-prefresh"),
                    {
                      library: ["preact-like-framework"], // the customizable preact name, default is `["preact", "preact/compat", "react"]`
                    },
                  ],
                ],
              },
              parser: {
                syntax: "ecmascript",
                jsx: true,
              },
              transform: {
                react: {
                  development: isDev,
                  refresh: isDev, // enable common react transformation
                },
              },
            },
          },
        },
      },
    ],
  },
  plugins: [isDev && new PreactRefreshPlugin()].filter(Boolean),
};

• Type: Rspack.RuleSetCondition
• Default: /\.([jt]sx?)$/

Include files to be processed by the plugin. The value is the same as the rule.test option in Rspack.

new PreactRefreshPlugin({
  include: [/\.jsx$/, /\.tsx$/],
});

• Type: Rspack.RuleSetCondition
• Default: /node_modules/

Exclude files from being processed by the plugin. The value is the same as the rule.exclude option in Rspack.

new PreactRefreshPlugin({
  exclude: [/node_modules/, /some-other-module/],
});

• Type: string
• Default: path.dirname(require.resolve('preact/package.json'))

Path to the preact package.

const path = require("node:path");

new PreactRefreshPlugin({
  preactPath: path.dirname(require.resolve("preact/package.json")),
});

See examples/preact-refresh for the full example.

Thanks to the prefresh created by @Jovi De Croock, which inspires implement this plugin.

Rspack is MIT licensed.

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