fix(webpack): add extension alias support for handling ESM libs (#30513)

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## Current Behavior
<!-- This is the behavior we have today -->
Currently, if you have a webpack application that uses out
NxWebpackAppPlugin and has a non-buildable lib that has exports with
extension enabled for example:`export * from './lib/lib8446520.js';`.
The app fails to build.

## Expected Behavior
<!-- This is the behavior we should expect with the changes in this PR
-->
When using webpack and including libraries that contain extension it
should resolve.

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

Fixes #30492

Author: ndcunningham

e2e/react/src/react-ts-solution.test.ts

@@ -1,9 +1,15 @@
 import {
+  checkFilesExist,
   cleanupProject,
+  getPackageManagerCommand,
   newProject,
+  readFile,
   readJson,
   runCLI,
+  runCommand,
   uniq,
+  updateFile,
+  updateJson,
 } from '@nx/e2e/utils';
 
 describe('React (TS solution)', () => {
@@ -38,4 +44,47 @@ describe('React (TS solution)', () => {
       `Successfully ran target test for project ${lib}`
     );
   }, 90000);
+
+  it('should be able to use Webpack to build apps with an imported lib', async () => {
+    const appName = uniq('app');
+    const libName = uniq('lib');
+
+    runCLI(
+      `generate @nx/react:app packages/${appName} --bundler=webpack --no-interactive --skipFormat --linter=eslint --unitTestRunner=none`
+    );
+    runCLI(
+      `generate @nx/js:lib libs/${libName} --bundler=none --no-interactive --unit-test-runner=none --skipFormat --linter=eslint`
+    );
+
+    const mainPath = `packages/${appName}/src/main.tsx`;
+    updateFile(
+      mainPath,
+      `
+          import {${libName}} from '@${workspaceName}/${libName}';
+          ${readFile(mainPath)}
+          console.log(${libName}());
+        `
+    );
+
+    runCLI('sync');
+
+    // Add library to package.json to make sure it is linked (not needed for npm package manager)
+    updateJson(`packages/${appName}/package.json`, (json) => {
+      return {
+        ...json,
+        devDependencies: {
+          ...(json.devDependencies || {}),
+          [`@${workspaceName}/${libName}`]: 'workspace:*',
+        },
+      };
+    });
+
+    runCommand(
+      `cd packages/${appName} && ${getPackageManagerCommand().install}`
+    );
+
+    runCLI(`build ${appName}`);
+
+    checkFilesExist(`packages/${appName}/dist/index.html`);
+  }, 90_000);
 });

e2e/react/src/react-webpack.test.ts

@@ -10,7 +10,7 @@ import {
   updateFile,
 } from '@nx/e2e/utils';
 
-describe('Build React applications and libraries with Vite', () => {
+describe('Build React applications and libraries with Webpack', () => {
   beforeAll(() => {
     newProject({
       packages: ['@nx/react'],

packages/webpack/src/plugins/nx-webpack-plugin/lib/apply-base-config.ts

@@ -26,6 +26,10 @@ const IGNORED_WEBPACK_WARNINGS = [
   /could not find any license/i,
 ];
 
+const extensionAlias = {
+  '.js': ['.ts', '.js'],
+  '.mjs': ['.mts', '.mjs'],
+};
 const extensions = ['.ts', '.tsx', '.mjs', '.js', '.jsx'];
 const mainFields = ['module', 'main'];
 
@@ -356,6 +360,10 @@ function applyNxDependentConfig(
   config.resolve = {
     ...config.resolve,
     extensions: [...(config?.resolve?.extensions ?? []), ...extensions],
+    extensionAlias: {
+      ...(config.resolve?.extensionAlias ?? {}),
+      ...extensionAlias,
+    },
     alias: {
       ...(config.resolve?.alias ?? {}),
       ...(options.fileReplacements?.reduce(