feat(browser): support Module Federation in Browser Mode by 9aoy · Pull Request #1639 · web-infra-dev/rstest

9aoy · 2026-07-29T03:15:11Z

Summary

This PR enables Module Federation in Rstest Browser Mode using the bundler's web federation runtime while preserving the existing Node runner compatibility shims.

allow federation and @module-federation/rstest in browser projects, including browser runtime config projection
keep the standard Browser Mode HMR and lazy-compilation behavior without federation-specific disabling
add a real HTTP-remote Browser Mode example, headed-watch coverage, and English/Chinese documentation

Checklist

Tests updated (or not required).
Documentation updated (or not required).

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github-actions · 2026-07-29T03:33:10Z

Rsdoctor Bundle Diff Analysis

Found 13 projects in monorepo, 3 projects with changes.

📊 Quick Summary

Project	Total Size	Change
browser	1.1 MB	-208.0 B (-0.0%)
adapter-rsbuild	6.1 KB	0
browser-react	6.4 KB	0
browser-ui	811.2 KB	0
coverage-istanbul	19.2 KB	0
coverage-v8	80.1 KB	0
playwright	47.6 KB	0
adapter-rslib	50.4 KB	0
adapter-rspack	9.2 KB	0
core/browser	578.1 KB	-37.0 B (-0.0%)
core/main	1.8 MB	+15.0 B (0.0%)
vscode/extension	1.2 MB	0
vscode/worker	14.8 KB	0

📋 Detailed Reports (Click to expand)

📁 browser

Path: packages/browser/.rsdoctor/rsdoctor-data.json

📌 Baseline Commit: 1820b0ce6f | PR: #1652

Metric	Current	Baseline	Change
📊 Total Size	1.1 MB	1.1 MB	-208.0 B (-0.0%)
📄 JavaScript	1.0 MB	1.0 MB	-208.0 B (-0.0%)
🎨 CSS	11.6 KB	11.6 KB	0
🌐 HTML	765.0 B	765.0 B	0
📁 Other Assets	43.4 KB	43.4 KB	0

📦 Download Diff Report: browser Bundle Diff

📁 core/browser

Path: packages/core/.rsdoctor/browser/rsdoctor-data.json

📌 Baseline Commit: 1820b0ce6f | PR: #1652

Metric	Current	Baseline	Change
📊 Total Size	578.1 KB	578.2 KB	-37.0 B (-0.0%)
📄 JavaScript	435.0 KB	435.0 KB	0
🎨 CSS	0 B	0 B	0
🌐 HTML	0 B	0 B	0
📁 Other Assets	143.1 KB	143.2 KB	-37.0 B (-0.0%)

📦 Download Diff Report: core/browser Bundle Diff

📁 core/main

Path: packages/core/.rsdoctor/main/rsdoctor-data.json

📌 Baseline Commit: 1820b0ce6f | PR: #1652

Metric	Current	Baseline	Change
📊 Total Size	1.8 MB	1.8 MB	+15.0 B (0.0%)
📄 JavaScript	1.4 MB	1.4 MB	+47.0 B (0.0%)
🎨 CSS	0 B	0 B	0
🌐 HTML	0 B	0 B	0
📁 Other Assets	385.2 KB	385.3 KB	-32.0 B (-0.0%)

📦 Download Diff Report: core/main Bundle Diff

Generated by Rsdoctor GitHub Action

cloudflare-workers-and-pages · 2026-07-29T03:39:40Z

Deploying rstest with Cloudflare Pages

Latest commit:	`4604e31`
Status:	✅ Deploy successful!
Preview URL:	https://dc69f7b2.rstest.pages.dev
Branch Preview URL:	https://9aoy-feat-mf-browser-mode.rstest.pages.dev

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chatgpt-codex-connector · 2026-07-30T09:38:04Z

+  },
+  plugins: [
+    pluginReact(),
+    federation({


Select the browser target for the federation plugin

In this Browser Mode config, calling federation without its second argument retains the plugin's Node-target default, so ComponentRemote.browser.test.tsx is bundled with the Node federation setup instead of the web runtime and cannot load the browser remote. The headed-watch fixture correctly passes { target: 'browser' }; apply the same option here and in the Browser Mode documentation example.

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chatgpt-codex-connector · 2026-07-30T09:38:04Z

+
+export default defineConfig({
+  federation: true,
+  globalSetup: ['./scripts/rstestBrowserGlobalSetup.ts'],


Run browser global setup before collecting federated tests

When this configuration is used with rstest list, browser collection goes directly through executor.collect() without running runBrowserGlobalSetupStage, unlike node collection. The static component-app/Button import is evaluated during collection, but this setup is what starts the remote on port 3001, so discovery returns a BrowserCollectError or times out; run and tear down browser global setup around non-files-only collection.

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chatgpt-codex-connector · 2026-07-30T09:38:04Z

+    'serve',
+  ]);
+  globalThis.__RSTEST_MF_CHILDREN__!.push(server);
+  await waitForUrl(browserRemoteEntryUrl, 30_000);


Clean up the remote when readiness fails

If the browser server starts but remoteEntry.js never becomes reachable—for example, because the output filename changes or serve cannot expose the build—this await throws before the global setup successfully registers its exported teardown. Rstest's failed-setup path therefore terminates the setup worker without calling cleanupRemote, leaving the spawned pnpm serve process and port 3001 behind; catch this readiness failure, clean up the tracked child, and then rethrow.

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Copilot AI review requested due to automatic review settings July 29, 2026 03:15

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Comment thread packages/core/src/core/browser/loader.ts Outdated

Comment thread packages/core/src/core/browser/loader.ts Outdated

Comment thread packages/browser/src/hostController.ts Outdated

Comment thread packages/core/src/core/browser/loader.ts Outdated

9aoy marked this pull request as draft July 29, 2026 03:23

9aoy mentioned this pull request Jul 29, 2026

fix(browser): preserve Browser UI routes with generated HTML #1640

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Copilot AI review requested due to automatic review settings July 29, 2026 03:39

9aoy force-pushed the 9aoy/feat-mf-browser-mode branch from 16bbd5b to c4064aa Compare July 29, 2026 03:39

Copilot AI reviewed Jul 29, 2026

9aoy changed the base branch from main to 9aoy/fix-browser-ui-html-route July 29, 2026 03:40

Base automatically changed from 9aoy/fix-browser-ui-html-route to main July 29, 2026 04:41

9aoy force-pushed the 9aoy/feat-mf-browser-mode branch from c4064aa to 6621527 Compare July 30, 2026 03:59

Copilot AI review requested due to automatic review settings July 30, 2026 03:59

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Copilot AI review requested due to automatic review settings July 30, 2026 04:39

9aoy force-pushed the 9aoy/feat-mf-browser-mode branch from 6621527 to 387dfab Compare July 30, 2026 04:39

Copilot AI reviewed Jul 30, 2026

9aoy marked this pull request as ready for review July 30, 2026 06:13

9aoy requested a review from ScriptedAlchemy July 30, 2026 06:26

feat(browser): support Module Federation in Browser Mode

4604e31

9aoy force-pushed the 9aoy/feat-mf-browser-mode branch from 387dfab to 4604e31 Compare July 30, 2026 09:29

Copilot AI review requested due to automatic review settings July 30, 2026 09:29

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9aoy mentioned this pull request Jul 31, 2026

fix(browser): run globalSetup when listing tests #1659

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9aoy commented Jul 29, 2026 •

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