[Bug]: Webpack Bundle Analyzer shows the empty analysis

[Verthon]

Version

System:
    OS: macOS 26.5.1
    CPU: (10) arm64 Apple M1 Max
    Memory: 110.19 MB / 32.00 GB
    Shell: 5.9 - /bin/zsh
  Browsers:
    Chrome: 149.0.7827.55
    Firefox: 151.0.3
    Safari: 26.5
  npmPackages:
    @rsbuild/core: ^2.0.11 => 2.0.11 
    @rsbuild/plugin-react: ^2.0.1 => 2.0.1

Details

I have added the Webpack Bundle Analyzer using this doc https://rsbuild.rs/guide/upgrade/v1-to-v2#remove-performancebundleanalyze however on the latest rsbuild it doesnt provide any analysis, all I have in the terminal is No bundles were parsed. Analyzer will show only original module sizes from stats file.

On the latest RSBuild v1, the same setup was showing the analysis yet I couldn't change the tabs to gzip etc

Setup:

import { defineConfig } from "@rsbuild/core";
import { pluginReact } from "@rsbuild/plugin-react";
import { BundleAnalyzerPlugin } from "webpack-bundle-analyzer";

const analyze = process.env.ANALYZE;
const analyzerMode = analyze ? "static" : "json";

export default defineConfig({
  plugins: [pluginReact()],
  output: {
    cleanDistPath: true,
  },
  tools: {
    rspack: {
      plugins: [
        new BundleAnalyzerPlugin({
          analyzerMode,
          generateStatsFile: analyzerMode === "json",
          openAnalyzer: analyzerMode === "static",
          reportFilename:
            analyzerMode === "json" ? "report.json" : "report.html",
        }),
      ],
    },
  },
});

    "build": "rsbuild build",
    "build:analyze": "ANALYZE=true rsbuild build",

I have prepared the repro for it https://github.com/Verthon/webpack-bundle-analyzer-repro

Thanks, let me know if this is clear

Reproduce link

https://github.com/Verthon/webpack-bundle-analyzer-repro

Reproduce Steps

1. install dependencies
2. run npm run build:analyze
3. check the browser output it won't have the analysis

Alternative flow for RSBuild v1

1. install RSBuild v1 npm i @rsbuild/plugin-react@1 @rsbuild/core@1
2. run npm run build:analyze
3. check the browser output it will display the results, however you can't change the tabs (to gzip/parsed etc)

[chenjiahan]

The root cause appears to be that Rspack v2 now uses more minimal default stats.toJson() output, so webpack-bundle-analyzer cannot get the required data when generating the report.

We will continue investigating a suitable way to improve this compatibility and follow up with a proper solution. @SyMind

As an alternative, you can use Rsdoctor for bundle analysis: https://rsbuild.rs/guide/debug/rsdoctor

[SyMind]

@Verthon I opened a PR for this issue: webpack/webpack-bundle-analyzer#718

[Verthon]

Thank you Team, much appreciated.

@chenjiahan Regarding RSDoctor, we use it, however, it doesn't cover the gzipped part in the treeview - it only appears in the stats tab. I have pushed the example to the repro under:

npm run build:rsdoctor

[chenjiahan]

Thank you! We will fix it

[elecmonkey]

Thank you Team, much appreciated.

@chenjiahan Regarding RSDoctor, we use it, however, it doesn't cover the gzipped part in the treeview - it only appears in the stats tab. I have pushed the example to the repro under:

npm run build:rsdoctor

@Verthon thanks for your report, we've fixed some problems in web-infra-dev/rsdoctor#1736 for main and web-infra-dev/rsdoctor#1737 for v1.x branch. cc @chenjiahan

[yifancong]

@Verthon The repair version has been issued, and you can use @rsdoctor/rspack-plugin@1.5.14~ Thank you for updating and using.