Hot reload error with React Router v7 BrowserRouter

[efriandika]

Describe the bug

Use:

• Latest rsbuild version 1.5.10
• Latest react version 19.1.1
• Latest react-router in exposed component
• use latest @module-federation/rsbuild-plugin

Or clone and run the Reproduction repro.

You will get this error when you just ran: 'yarn dev'. Once you refresh the page / ctrl + r, the error will be gone, then the project is working as expected.

EventSource failed loading: GET "http://localhost:3001/lazy-compilation-using-lazy-compilation-proxy%7Cbuiltin%3Areact-refresh-loader!builtin%3Aswc-loader%3F%3FruleSet%5B1%5D.rules%5B5%5D.use%5B0%5D!%2FUsers%2Fo772022%2FWorkspace%2FPlaygrounds%2Freact-provider%2Fsrc%2Fbootstrap.tsx".
hot_module_replacement:60 undefined factory webpack/sharing/consume/default/react/react?60ea
overrideMethod @ hook.js:608
__webpack_require__ @ refreshUtils.js:311
fn @ hot_module_replacement:60
(anonymous) @ react-jsx-dev-runtime.development.js:287
./node_modules/react/cjs/react-jsx-dev-runtime.development.js @ react-jsx-dev-runtime.development.js:349
__webpack_require__ @ refreshUtils.js:311
fn @ hot_module_replacement:60
./node_modules/react/jsx-dev-runtime.js @ jsx-dev-runtime.js:6
__webpack_require__ @ refreshUtils.js:311
fn @ hot_module_replacement:60
./src/bootstrap.tsx @ App.tsx:12
__webpack_require__ @ refreshUtils.js:311
fn @ hot_module_replacement:60
Promise.then
./src/bootstrap.tsx!lazy-compilation-proxy @ src_bootstrap_tsx_lazy-compilation-proxy.d7ef8967ba11eb38.hot-update.js:5
__webpack_require__ @ refreshUtils.js:311
_requireSelf @ hot_module_replacement:101
apply @ jsonp_chunk_loading:417
(anonymous) @ hot_module_replacement:320
internalApply @ hot_module_replacement:318
(anonymous) @ hot_module_replacement:263
waitForBlockingPromises @ hot_module_replacement:217
(anonymous) @ hot_module_replacement:261
Promise.then
(anonymous) @ hot_module_replacement:260
Promise.then
(anonymous) @ hot_module_replacement:240
Promise.then
hotCheck @ hot_module_replacement:231
tryApplyUpdates @ hmr.js:72
handleSuccess @ hmr.js:36
onMessage @ hmr.js:101
refreshUtils.js:311 Uncaught (in promise) Error: RuntimeError: factory is undefined (webpack/sharing/consume/default/react/react?60ea)
    at __webpack_require__ (refreshUtils.js:311:1)
    at fn (hot_module_replacement:60:1)
    at react-jsx-dev-runtime.development.js:287:1
    at ./node_modules/react/cjs/react-jsx-dev-runtime.development.js (react-jsx-dev-runtime.development.js:349:1)
    at __webpack_require__ (refreshUtils.js:311:1)
    at fn (hot_module_replacement:60:1)
    at ./node_modules/react/jsx-dev-runtime.js (jsx-dev-runtime.js:6:1)
    at __webpack_require__ (refreshUtils.js:311:1)
    at fn (hot_module_replacement:60:1)
    at ./src/bootstrap.tsx (App.tsx:12:1)

Reproduction

https://github.com/efriandika/rsbuild-issue-repro

Used Package Manager

yarn

System Info

System:
    OS: macOS 26.0
    CPU: (10) arm64 Apple M1 Max
    Memory: 1.14 GB / 32.00 GB
    Shell: 5.9 - /bin/zsh
  Binaries:
    Node: 20.19.1 - ~/.nvm/versions/node/v20.19.1/bin/node
    Yarn: 1.22.22 - ~/.nvm/versions/node/v20.19.1/bin/yarn
    npm: 10.8.2 - ~/.nvm/versions/node/v20.19.1/bin/npm
  Browsers:
    Chrome: 140.0.7339.133
    Safari: 26.0

Validations

• Read the docs.
• Read the common issues list.
• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
• Make sure this is a Module federation issue and not a framework-specific issue.
• The provided reproduction is a minimal reproducible example of the bug.

[2heal1]

Because Rsbuild enable lazy compile by default, and this not compile the shared module .

Let's see if we can do something special compat for MF @chenjiahan ？

[chenjiahan]

I think this needs to be handled at the Rspack core — for example, by having the lazy compilation plugin skip MF’s shared modules. @stormslowly cc

[stormslowly]

After debuging with @2heal1, We have found that the root cause is mf runtime doesn't handle chunk map changing properly.

@2heal1 will make a fix for that.

Thanks a lot @2heal1