test(integration): add rsc-mf fixture for module federation + RSC by ScriptedAlchemy · Pull Request #1 · ScriptedAlchemy/modern.js

ScriptedAlchemy · 2026-02-12T03:58:54Z

Conventional Commit

test(integration): add rsc-mf fixture for module federation + RSC

Summary

Add a new rsc-mf integration fixture that demonstrates Module Federation with full React Server Components support in Modern.js.
Cover remote server actions, client components, and server-only modules in the fixture.
Pin to the required Rspack canary and configure source.enableAsyncEntry: false in both host and remote Modern.js configs for stable RSC runtime behavior when MF is enabled.

Why

This provides a concrete, reproducible integration test setup for MF + RSC and documents the runtime configuration required to keep server behavior stable.

Checklist

I have added changeset via pnpm run change.
I have updated the documentation.
I have added tests to cover my changes.

cursor · 2026-02-12T03:58:56Z

Cursor Agent can help with this pull request. Just @cursor in comments and I'll start working on changes in this branch.
_{Learn more about Cursor Agents}

changeset-bot · 2026-02-12T03:59:00Z

⚠️ No Changeset found

Latest commit: 5683fbe

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github-actions · 2026-02-12T04:04:11Z

Rsdoctor Bundle Diff Analysis

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Project	Total Size	Change
bundle-diff	2.9 MB	+6.0 B (0.0%)

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📁 bundle-diff

Path: benchmark/bundle-diff/dist/rsdoctor-data.json

📌 Baseline Commit: 7eb41c50e6 | PR: #2, #8351

Metric	Current	Baseline	Change
📊 Total Size	2.9 MB	2.9 MB	+6.0 B (0.0%)
📄 JavaScript	499.7 KB	499.7 KB	0
🎨 CSS	1.2 KB	1.2 KB	0
🌐 HTML	1.6 KB	1.6 KB	0
📁 Other Assets	2.4 MB	2.4 MB	+6.0 B (0.0%)

📦 Download Diff Report: bundle-diff Bundle Diff

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…orts

Avoid calling string methods on non-string remote `external` values while replacing localhost URLs, so object remotes without an external string no longer throw at runtime. Co-authored-by: Cursor <cursoragent@cursor.com>

…sc-build-a6af Module federation rsc build

Co-authored-by: Zack Jackson <ScriptedAlchemy@users.noreply.github.com>

Prevent static middleware path traversal-by-reset by resolving requests under the bundles root with explicit containment checks, and make bridge loading dedupe atomic by caching a pending promise before triggering remote load side effects. Co-authored-by: Cursor <cursoragent@cursor.com>

Co-authored-by: Zack Jackson <ScriptedAlchemy@users.noreply.github.com>

Copilot

Pull request overview

This PR adds a comprehensive integration test fixture (rsc-mf) demonstrating Module Federation with full React Server Components (RSC) support in Modern.js. The fixture includes host and remote applications with server actions, client components, and server-only modules, along with extensive contract tests validating configuration behavior.

Changes:

New rsc-mf integration fixture with host/remote apps supporting RSC + Module Federation
Contract tests for module federation config, Modern.js config, and tsconfig alignment
Runtime implementation for RSC bridge, action ID resolution, and async startup loading
Server-side static file serving and bundle loading strategies
Updates to i18n MF fixtures to use workspace references
Rspack canary version pinning for MF + RSC experimental support

Reviewed changes

Copilot reviewed 119 out of 125 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
tests/integration/rsc-mf/**	New integration test fixture with host/remote apps, comprehensive contract tests
packages/modernjs-v3/**	New Modern.js v3 plugin package with RSC + MF runtime, server plugins, and configuration
packages/server/core/src/adapters/node/plugins/resource.ts	Bundle loader strategy registration system for custom bundle formats
packages/runtime/render/src/client/callServer.ts	Pluggable action ID resolver for Module Federation remote actions
packages/runtime/render/src/server/rsc/rsc.tsx	Dev-only detailed error messages for RSC action failures
tests/integration/i18n/mf/**/package.json	Updated to use workspace references instead of hardcoded versions
package.json	Rspack canary version and Module Federation pkg.pr.new dependency overrides

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ScriptedAlchemy · 2026-02-18T20:51:25Z

+const BUNDLE_LOADER_STRATEGIES_KEY = '__MODERN_JS_BUNDLE_LOADER_STRATEGIES__';
+
+type GlobalWithBundleLoaderStrategies = typeof globalThis & {
+  [BUNDLE_LOADER_STRATEGIES_KEY]?: BundleLoaderStrategy[];


why are we adding global exposures?

Updated in 52489bffc3.

Removed the global strategy store entirely. The bundle loader strategy registry is now module-scoped (bundleLoaderStrategies) instead of using globalThis, so no global exposure is introduced.

Update fixture package pins to the latest core canaries and tighten rsc-mf containment resolution contracts to match the new modern-js-v3 loading behavior. Co-authored-by: Cursor <cursoragent@cursor.com>

…cy check Co-authored-by: Cursor <cursoragent@cursor.com>

ScriptedAlchemy · 2026-02-23T23:06:39Z

Closing this fork PR in favor of upstream PR: web-infra-dev#8366

cursoragent added 27 commits February 13, 2026 22:29

test(rsc-mf): document host proxy action mapping intent

3fa1479

test(rsc-mf): expand exposure coverage for bundled action exports

cb8a21b

test(rsc-mf): add bundled server-info expose coverage

77b3b26

test(rsc-mf): map bundled action re-export ids to host proxies

e5c6575

refactor(rsc-mf): remove remote chunk text patching middleware

d680e23

test(rsc-mf): assert no browser runtime errors in dev mode

92f8e4e

test(rsc-mf): assert action posts stay on host endpoint

a1d8490

refactor(rsc-mf): drop remote client chunkLoadingGlobal override

0f0ca8e

refactor(rsc-mf): consume bundled action expose via namespace import

e75f56e

test(rsc-mf): assert action posts avoid remote origin

336d821

test(rsc-mf): assert host-resolvable x-rsc-action ids

6c19452

refactor(rsc-mf): use namespace imports in host server bundle coverage

ed0f9f5

refactor(rsc-mf): route host proxy actions through bundled expose imp…

a40bae2

…orts

test(rsc-mf): assert host proxy action manifest coverage

99989e1

test(rsc-mf): cover bundled nested and increment host actions

cf1e7fb

refactor(rsc-mf): stabilize remote callback registration keying

6871db7

refactor(rsc-mf): avoid client stringify in callback dependency

051929d

test(rsc-mf): assert posted action ids match host proxy set

6cb5574

refactor(rsc-mf): centralize host proxy mapping and manifest forms

76ec229

test(rsc-mf): assert host proxy id list uniqueness and format

4368d53

test(rsc-mf): surface direct and bundled proxy id groups

25af768

test(rsc-mf): validate proxy id group union membership

6256add

test(rsc-mf): assert proxy map entry count aligns with ids

225df15

test(rsc-mf): assert proxy map entry count aligns with ids

d806ec0

test(rsc-mf): assert mapped proxy id coverage markers

f02e2cf

refactor(rsc-mf): model effective remote action map keys

c220479

test(rsc-mf): bind posted action ids to effective map key count

db078ac

ScriptedAlchemy and others added 2 commits February 17, 2026 16:28

fix(modernjs-v3): guard remote external URL rewrite

494d849

Avoid calling string methods on non-string remote `external` values while replacing localhost URLs, so object remotes without an external string no longer throw at runtime. Co-authored-by: Cursor <cursoragent@cursor.com>

Merge pull request #2 from ScriptedAlchemy/cursor/module-federation-r…

23160ec

…sc-build-a6af Module federation rsc build

ScriptedAlchemy changed the title ~~Module federation RSC example~~ test(integration): add rsc-mf fixture for module federation + RSC Feb 18, 2026

ScriptedAlchemy commented Feb 18, 2026

View reviewed changes

Comment thread packages/modernjs-v3/src/runtime/rsc-client-callback-bootstrap.js Outdated

ScriptedAlchemy commented Feb 18, 2026

View reviewed changes

Comment thread packages/modernjs-v3/src/server/staticMiddleware.ts Outdated

ScriptedAlchemy commented Feb 18, 2026

View reviewed changes

Comment thread packages/modernjs-v3/src/server/staticMiddleware.ts Outdated

cursoragent and others added 2 commits February 18, 2026 02:59

fix(rsc-mf): harden callback routing and target config patching

de599db

Co-authored-by: Zack Jackson <ScriptedAlchemy@users.noreply.github.com>

fix(rsc-mf): harden action fallback and static headers

27af5a7

ScriptedAlchemy commented Feb 18, 2026

View reviewed changes

Comment thread packages/modernjs-v3/tests/config-plugin-contract.test.ts

ScriptedAlchemy and others added 11 commits February 17, 2026 21:28

test(modernjs-v3): include config contract in rstest suite

66d692f

Co-authored-by: Zack Jackson <ScriptedAlchemy@users.noreply.github.com>

chore(ci): trigger workflow rerun

69eb929

Co-authored-by: Zack Jackson <ScriptedAlchemy@users.noreply.github.com>

fix(ci): resolve lint regressions in rsc-mf changes

6180082

Co-authored-by: Zack Jackson <ScriptedAlchemy@users.noreply.github.com>

test(builder): refresh snapshots after rsc-mf config updates

c3edf41

Co-authored-by: Zack Jackson <ScriptedAlchemy@users.noreply.github.com>

test(e2e): align inline-chunk runtime assertions

cf44bf9

Co-authored-by: Zack Jackson <ScriptedAlchemy@users.noreply.github.com>

test(e2e): update inline chunk html runtime expectations

7642d35

Co-authored-by: Zack Jackson <ScriptedAlchemy@users.noreply.github.com>

fix(rsc-mf): update bridge runtime and test coverage

8558ccb

fix: harden rsc bridge alias resolution and bundle path checks

3f4e4d5

Co-authored-by: Zack Jackson <ScriptedAlchemy@users.noreply.github.com>

test: format fallback alias runtime guard assertion

c196826

Co-authored-by: Zack Jackson <ScriptedAlchemy@users.noreply.github.com>

fix: harden mf rsc bundle loading and runtime hooks

22094ea

ScriptedAlchemy requested a review from Copilot February 18, 2026 20:46

Copilot started reviewing on behalf of ScriptedAlchemy February 18, 2026 20:46 View session

ScriptedAlchemy commented Feb 18, 2026

View reviewed changes

Comment thread packages/runtime/render/src/client/callServer.ts Outdated

Copilot AI reviewed Feb 18, 2026

View reviewed changes

Comment thread packages/modernjs-v3/package.json

Comment thread package.json

ScriptedAlchemy commented Feb 18, 2026

View reviewed changes

ScriptedAlchemy and others added 3 commits February 18, 2026 13:06

fix: align callServer window access and avoid global strategy state

52489bf

chore(rsc-mf): refresh federation canary pins and fixture contracts

27bb4e0

Update fixture package pins to the latest core canaries and tighten rsc-mf containment resolution contracts to match the new modern-js-v3 loading behavior. Co-authored-by: Cursor <cursoragent@cursor.com>

chore(ci): ignore rsc-mf canary fixture paths in dependency consisten…

5683fbe

…cy check Co-authored-by: Cursor <cursoragent@cursor.com>

ScriptedAlchemy closed this Feb 23, 2026

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test(integration): add rsc-mf fixture for module federation + RSC#1
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