fix(react): ensure interop between webpack and rspack module federation (#27824)

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## Current Behavior
<!-- This is the behavior we have today -->
When we had initially designed our Module Federation support for React,
we had to get some changes put in place in webpack itself directly to
allow for ESM.

However, the best support for Module Federation for both Rspack and
Webpack comes from CJS.


## Expected Behavior
<!-- This is the behavior we should expect with the changes in this PR
-->
Ensure CJS is used to ensure interopability between webpack and rspack
module federation applications

## Related Issue(s)
<!-- Please link the issue being fixed so it gets closed when this is
merged. -->

Fixes #

e2e/react/src/react-module-federation.rspack.test.ts

@@ -25,7 +25,7 @@ describe('React Rspack Module Federation', () => {
       newProject({ packages: ['@nx/react'] });
     });
 
-    // afterAll(() => cleanupProject());
+    afterAll(() => cleanupProject());
 
     it.each`
       js
@@ -126,6 +126,133 @@ describe('React Rspack Module Federation', () => {
       500_000
     );
 
+    it('should have interop between webpack host and rspack remote', async () => {
+      const shell = uniq('shell');
+      const remote1 = uniq('remote1');
+      const remote2 = uniq('remote2');
+
+      runCLI(
+        `generate @nx/react:host ${shell} --remotes=${remote1} --bundler=webpack --e2eTestRunner=cypress --style=css --no-interactive --skipFormat`
+      );
+
+      runCLI(
+        `generate @nx/react:remote ${remote2} --host=${shell} --bundler=rspack --style=css --no-interactive --skipFormat`
+      );
+
+      updateFile(
+        `apps/${shell}-e2e/src/integration/app.spec.ts`,
+        stripIndents`
+        import { getGreeting } from '../support/app.po';
+
+        describe('shell app', () => {
+          it('should display welcome message', () => {
+            cy.visit('/')
+            getGreeting().contains('Welcome ${shell}');
+          });
+
+          it('should load remote 1', () => {
+            cy.visit('/${remote1}')
+            getGreeting().contains('Welcome ${remote1}');
+          });
+
+          it('should load remote 2', () => {
+            cy.visit('/${remote2}')
+            getGreeting().contains('Welcome ${remote2}');
+          });
+        });
+      `
+      );
+
+      [shell, remote1, remote2].forEach((app) => {
+        ['development', 'production'].forEach(async (configuration) => {
+          const cliOutput = runCLI(`run ${app}:build:${configuration}`);
+          expect(cliOutput).toContain('Successfully ran target');
+        });
+      });
+
+      const serveResult = await runCommandUntil(`serve ${shell}`, (output) =>
+        output.includes(`http://localhost:${readPort(shell)}`)
+      );
+
+      await killProcessAndPorts(serveResult.pid, readPort(shell));
+
+      if (runE2ETests()) {
+        const e2eResultsSwc = await runCommandUntil(
+          `e2e ${shell}-e2e --no-watch --verbose`,
+          (output) => output.includes('All specs passed!')
+        );
+
+        await killProcessAndPorts(e2eResultsSwc.pid, readPort(shell));
+
+        const e2eResultsTsNode = await runCommandUntil(
+          `e2e ${shell}-e2e --no-watch --verbose`,
+          (output) =>
+            output.includes('Successfully ran target e2e for project'),
+          {
+            env: { NX_PREFER_TS_NODE: 'true' },
+          }
+        );
+        await killProcessAndPorts(e2eResultsTsNode.pid, readPort(shell));
+      }
+    }, 500_000);
+
+    it('should have interop between rspack host and webpack remote', async () => {
+      const shell = uniq('shell');
+      const remote1 = uniq('remote1');
+      const remote2 = uniq('remote2');
+      runCLI(
+        `generate @nx/react:host ${shell} --remotes=${remote1} --bundler=rspack --e2eTestRunner=cypress --style=css --no-interactive --skipFormat`
+      );
+
+      runCLI(
+        `generate @nx/react:remote ${remote2} --host=${shell} --bundler=webpack --style=css --no-interactive --skipFormat`
+      );
+
+      updateFile(
+        `apps/${shell}-e2e/src/integration/app.spec.ts`,
+        stripIndents`
+        import { getGreeting } from '../support/app.po';
+
+        describe('shell app', () => {
+          it('should display welcome message', () => {
+            cy.visit('/')
+            getGreeting().contains('Welcome ${shell}');
+          });
+
+          it('should load remote 1', () => {
+            cy.visit('/${remote1}')
+            getGreeting().contains('Welcome ${remote1}');
+          });
+
+          it('should load remote 2', () => {
+            cy.visit('/${remote2}')
+            getGreeting().contains('Welcome ${remote2}');
+          });
+
+        });
+      `
+      );
+
+      if (runE2ETests()) {
+        const e2eResultsSwc = await runCommandUntil(
+          `e2e ${shell}-e2e --no-watch --verbose`,
+          (output) => output.includes('All specs passed!')
+        );
+
+        await killProcessAndPorts(e2eResultsSwc.pid, readPort(shell));
+
+        const e2eResultsTsNode = await runCommandUntil(
+          `e2e ${shell}-e2e --no-watch --verbose`,
+          (output) =>
+            output.includes('Successfully ran target e2e for project'),
+          {
+            env: { NX_PREFER_TS_NODE: 'true' },
+          }
+        );
+        await killProcessAndPorts(e2eResultsTsNode.pid, readPort(shell));
+      }
+    }, 500_000);
+
     describe('ssr', () => {
       it('should generate host and remote apps with ssr', async () => {
         const shell = uniq('shell');

packages/react/src/module-federation/utils.ts

@@ -127,7 +127,7 @@ export async function getModuleFederationConfig(
       mfConfig.remotes,
       'js',
       determineRemoteUrlFunction,
-      isLibraryTypeVar
+      true
     );
   }
 

packages/react/src/module-federation/with-module-federation.ts

@@ -6,9 +6,6 @@ import { getModuleFederationConfig } from './utils';
 import type { AsyncNxComposableWebpackPlugin } from '@nx/webpack';
 import { ModuleFederationPlugin } from '@module-federation/enhanced/webpack';
 
-const isVarOrWindow = (libType?: string) =>
-  libType === 'var' || libType === 'window';
-
 /**
  * @param {ModuleFederationConfig} options
  * @return {Promise<AsyncNxComposableWebpackPlugin>}
@@ -23,16 +20,12 @@ export async function withModuleFederation(
 
   const { sharedDependencies, sharedLibraries, mappedRemotes } =
     await getModuleFederationConfig(options);
-  const isGlobal = isVarOrWindow(options.library?.type);
 
   return (config, ctx) => {
     config.output.uniqueName = options.name;
     config.output.publicPath = 'auto';
 
-    if (isGlobal) {
     config.output.scriptType = 'text/javascript';
-    }
-
     config.optimization = {
       ...(config.optimization ?? {}),
       runtimeChunk: false,
@@ -46,15 +39,9 @@ export async function withModuleFederation(
       config.optimization.runtimeChunk = 'single';
     }
 
-    config.experiments = {
-      ...config.experiments,
-      outputModule: !isGlobal,
-    };
-
     config.plugins.push(
       new ModuleFederationPlugin({
         name: options.name,
-        library: options.library ?? { type: 'module' },
         filename: 'remoteEntry.js',
         exposes: options.exposes,
         remotes: mappedRemotes,
@@ -67,7 +54,7 @@ export async function withModuleFederation(
          *  { appX: 'appX@http://localhost:3001/remoteEntry.js' }
          *  { appY: 'appY@http://localhost:3002/remoteEntry.js' }
          */
-        ...(isGlobal ? { remoteType: 'script' } : {}),
+        remoteType: 'script',
         /**
          * Apply user-defined config overrides
          */