fix(module-federation): Add migration for ssr server file to run on it's own port (#27411)

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## Current Behavior
<!-- This is the behavior we have today -->
Currently, if you have a SSR Mfe project and you run multiple ssr
projects using the 'serve' target it would fail due to conflicting ports
unless explicitly set `PORT=4202 node dist/acme/server.js`.

## Expected Behavior
<!-- This is the behavior we should expect with the changes in this PR
-->
Now the default is to have the server take the same port as it was
generated with so that if you run multiple server apps that depends on
other apps in dev mode there will be no conflicts.

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

Fixes #

packages/react/migrations.json

@@ -47,6 +47,12 @@
       "version": "19.6.0-beta.4",
       "description": "Ensure Module Federation DTS is turned off by default.",
       "factory": "./src/migrations/update-19-6-0/turn-off-dts-by-default"
+    },
+    "update-module-federation-ssr-server-file": {
+      "cli": "nx",
+      "version": "19.6.0-beta.4",
+      "description": "Update the server file for Module Federation SSR port value to be the same as the 'serve' target port value.",
+      "factory": "./src/migrations/update-19-6-0/update-ssr-server-port"
     }
   },
   "packageJsonUpdates": {

packages/react/src/generators/setup-ssr/files/server.ts__tmpl__

@@ -8,7 +8,7 @@ const port = process.env['PORT'] || <%= port %>;
 const app = express();
 
 const browserDist = path.join(process.cwd(), '<%= browserBuildOutputPath %>');
-const indexPath =path.join(browserDist, 'index.html');
+const indexPath = path.join(browserDist, 'index.html');
 
 app.use(cors());
 

packages/react/src/migrations/update-19-6-0/update-ssr-server-port.spec.ts

@@ -0,0 +1,206 @@
+import { readProjectConfiguration, type Tree } from '@nx/devkit';
+import { createTreeWithEmptyWorkspace } from 'nx/src/devkit-testing-exports';
+import hostGenerator from '../../generators/host/host';
+import { Linter } from '@nx/eslint';
+import updateSsrServerPort from './update-ssr-server-port';
+describe('update-19-6-0 update-ssr-server-port migration', () => {
+  let tree: Tree;
+
+  beforeEach(() => {
+    tree = createTreeWithEmptyWorkspace();
+  });
+
+  it('should update host and remote port server files', async () => {
+    await hostGenerator(tree, {
+      name: 'shell',
+      e2eTestRunner: 'none',
+      unitTestRunner: 'none',
+      ssr: true,
+      linter: Linter.EsLint,
+      projectNameAndRootFormat: 'as-provided',
+      style: 'css',
+      remotes: ['product'],
+    });
+    const remotePort = readProjectConfiguration(tree, 'product').targets.serve
+      .options.port;
+
+    const shellPort = readProjectConfiguration(tree, 'shell').targets.serve
+      .options.port;
+
+    // This should already exists in the generated project
+    tree.write(
+      'product/server.ts',
+      tree
+        .read('product/server.ts', 'utf-8')
+        .replace(
+          'const port = 4201;',
+          `const port = process.env['PORT'] || 4200;`
+        )
+    );
+
+    updateSsrServerPort(tree);
+    expect(tree.read('product/server.ts', 'utf-8')).toContain(
+      `port = process.env['PORT'] || ${remotePort}`
+    );
+    expect(tree.read('product/server.ts', 'utf-8')).toMatchInlineSnapshot(`
+      "import * as path from 'path';
+      import express from 'express';
+      import cors from 'cors';
+
+      import { handleRequest } from './src/main.server';
+
+      const port = process.env['PORT'] || 4201;
+      const app = express();
+
+      const browserDist = path.join(process.cwd(), 'dist/product/browser');
+      const serverDist = path.join(process.cwd(), 'dist/product/server');
+      const indexPath = path.join(browserDist, 'index.html');
+
+      app.use(cors());
+
+      // Client-side static bundles
+      app.get(
+        '*.*',
+        express.static(browserDist, {
+          maxAge: '1y',
+        })
+      );
+
+      // Static bundles for server-side module federation
+      app.use(
+        '/server',
+        express.static(serverDist, {
+          maxAge: '1y',
+        })
+      );
+
+      app.use('*', handleRequest(indexPath));
+
+      const server = app.listen(port, () => {
+        console.log(\`Express server listening on http://localhost:\${port}\`);
+
+        /**
+         * DO NOT REMOVE IF USING @nx/react:module-federation-dev-ssr executor
+         * to serve your Host application with this Remote application.
+         * This message allows Nx to determine when the Remote is ready to be
+         * consumed by the Host.
+         */
+        process.send?.('nx.server.ready');
+      });
+
+      server.on('error', console.error);
+      "
+    `);
+
+    tree.write(
+      'shell/server.ts',
+      tree
+        .read('shell/server.ts', 'utf-8')
+        .replace(
+          'const port = 4200;',
+          `const port = process.env['PORT'] || 4200;`
+        )
+    );
+
+    updateSsrServerPort(tree);
+    expect(tree.read('shell/server.ts', 'utf-8')).toContain(
+      `port = process.env.PORT || ${shellPort}`
+    );
+    expect(tree.read('shell/server.ts', 'utf-8')).toMatchInlineSnapshot(`
+        "import * as path from 'path';
+        import express from 'express';
+        import cors from 'cors';
+        import { handleRequest } from './src/main.server';
+        const port = process.env.PORT || 4200;
+        const app = express();
+        const browserDist = path.join(process.cwd(), 'dist/shell/browser');
+        const indexPath = path.join(browserDist, 'index.html');
+        app.use(cors());
+        app.get('*.*', express.static(browserDist, {
+            maxAge: '1y',
+        }));
+        app.use('*', handleRequest(indexPath));
+        const server = app.listen(port, () => {
+            console.log(\`Express server listening on http://localhost:\${port}\`);
+        });
+        server.on('error', console.error);
+        "
+      `);
+  });
+
+  it('should update a host project server file', async () => {
+    await hostGenerator(tree, {
+      name: 'host',
+      e2eTestRunner: 'none',
+      unitTestRunner: 'none',
+      ssr: true,
+      linter: Linter.EsLint,
+      projectNameAndRootFormat: 'as-provided',
+      style: 'css',
+    });
+
+    const hostPort = readProjectConfiguration(tree, 'host').targets.serve
+      .options.port;
+
+    tree.write(
+      'host/server.ts',
+      tree
+        .read('host/server.ts', 'utf-8')
+        .replace(
+          'const port = 4200;',
+          `const port = process.env['PORT'] || 4200;`
+        )
+    );
+
+    updateSsrServerPort(tree);
+
+    expect(tree.read('host/server.ts', 'utf-8')).toContain(
+      `port = process.env.PORT || ${hostPort}`
+    );
+    expect(tree.read('host/server.ts', 'utf-8')).toMatchInlineSnapshot(`
+        "import * as path from 'path';
+        import express from 'express';
+        import cors from 'cors';
+        import { handleRequest } from './src/main.server';
+        const port = process.env.PORT || 4200;
+        const app = express();
+        const browserDist = path.join(process.cwd(), 'dist/host/browser');
+        const indexPath = path.join(browserDist, 'index.html');
+        app.use(cors());
+        app.get('*.*', express.static(browserDist, {
+            maxAge: '1y',
+        }));
+        app.use('*', handleRequest(indexPath));
+        const server = app.listen(port, () => {
+            console.log(\`Express server listening on http://localhost:\${port}\`);
+        });
+        server.on('error', console.error);
+        "
+      `);
+  });
+
+  it('should not update a mfe project that is not ssr', async () => {
+    await hostGenerator(tree, {
+      name: 'shell-not-ssr',
+      e2eTestRunner: 'none',
+      unitTestRunner: 'none',
+      ssr: false,
+      linter: Linter.EsLint,
+      projectNameAndRootFormat: 'as-provided',
+      style: 'css',
+    });
+
+    tree.write('shell-not-ssr/server.ts', 'const port = 9999;');
+    const shellPort = readProjectConfiguration(tree, 'shell-not-ssr').targets
+      .serve.options.port;
+
+    updateSsrServerPort(tree);
+
+    expect(tree.read('shell-not-ssr/server.ts', 'utf-8')).not.toContain(
+      `port = ${shellPort}`
+    );
+    expect(tree.read('shell-not-ssr/server.ts', 'utf-8')).toMatchInlineSnapshot(
+      `"const port = 9999;"`
+    );
+  });
+});

packages/react/src/migrations/update-19-6-0/update-ssr-server-port.ts

@@ -0,0 +1,146 @@
+import {
+  ProjectConfiguration,
+  type Tree,
+  getProjects,
+  joinPathFragments,
+  visitNotIgnoredFiles,
+} from '@nx/devkit';
+import { tsquery } from '@phenomnomnominal/tsquery';
+import * as ts from 'typescript';
+import { minimatch } from 'minimatch';
+import { forEachExecutorOptions } from '@nx/devkit/src/generators/executor-options-utils';
+import { type WebSsrDevServerOptions } from '@nx/webpack/src/executors/ssr-dev-server/schema';
+
+export default function update(tree: Tree) {
+  const projects = getProjects(tree);
+  const executors = [
+    '@nx/webpack:ssr-dev-server',
+    '@nx/react:module-federation-ssr-dev-server',
+  ];
+
+  executors.forEach((executor) => {
+    forEachExecutorOptions<WebSsrDevServerOptions>(
+      tree,
+      executor,
+      (options, projectName) => {
+        const project = projects.get(projectName);
+        if (isModuleFederationSSRProject(tree, project)) {
+          const port = options.port;
+          if (tree.exists(joinPathFragments(project.root, 'server.ts'))) {
+            const serverContent = tree.read(
+              joinPathFragments(project.root, 'server.ts'),
+              'utf-8'
+            );
+            if (serverContent && port) {
+              const updatedServerContent = updateServerPort(
+                serverContent,
+                port
+              );
+              if (updatedServerContent) {
+                tree.write(
+                  joinPathFragments(project.root, 'server.ts'),
+                  updatedServerContent
+                );
+              }
+            }
+          }
+        }
+      }
+    );
+  });
+}
+
+function updateServerPort(serverContent: string, port: number) {
+  const sourceFile = tsquery.ast(serverContent);
+
+  const serverPortNode = tsquery(
+    sourceFile,
+    `VariableDeclaration:has(Identifier[name="port"])`
+  )[0];
+  if (serverPortNode) {
+    const binaryExpression = tsquery(serverPortNode, 'BinaryExpression')[0];
+    if (binaryExpression) {
+      const leftExpression = tsquery(
+        binaryExpression,
+        'PropertyAccessExpression:has(Identifier[name="env"])'
+      )[0];
+      const rightExpression = tsquery(
+        binaryExpression,
+        'NumericLiteral[text="4200"]'
+      )[0];
+
+      if (leftExpression && rightExpression) {
+        const serverPortDeclaration = serverPortNode as ts.VariableDeclaration;
+        const newInitializer = ts.factory.createBinaryExpression(
+          // process.env.PORT
+          ts.factory.createPropertyAccessExpression(
+            ts.factory.createPropertyAccessExpression(
+              ts.factory.createIdentifier('process'),
+              ts.factory.createIdentifier('env')
+            ),
+            'PORT'
+          ),
+          // ||
+          ts.SyntaxKind.BarBarToken,
+          // port value
+          ts.factory.createNumericLiteral(port.toString())
+        );
+
+        const updatePortDeclaration = ts.factory.updateVariableDeclaration(
+          serverPortDeclaration,
+          serverPortDeclaration.name,
+          serverPortDeclaration.exclamationToken,
+          serverPortDeclaration.type,
+          newInitializer
+        );
+
+        const updatedStatements = sourceFile.statements.map((statement) => {
+          if (ts.isVariableStatement(statement)) {
+            const updatedDeclarationList =
+              statement.declarationList.declarations.map((decl) =>
+                decl === serverPortDeclaration ? updatePortDeclaration : decl
+              );
+
+            const updatedDeclList = ts.factory.updateVariableDeclarationList(
+              statement.declarationList,
+              updatedDeclarationList
+            );
+
+            return ts.factory.updateVariableStatement(
+              statement,
+              statement.modifiers,
+              updatedDeclList
+            );
+          }
+
+          return statement;
+        });
+
+        const updatedSourceFile = ts.factory.updateSourceFile(
+          sourceFile,
+          updatedStatements
+        );
+
+        const printer = ts.createPrinter();
+        return printer.printNode(
+          ts.EmitHint.Unspecified,
+          updatedSourceFile,
+          sourceFile
+        );
+      }
+    }
+  }
+}
+
+function isModuleFederationSSRProject(
+  tree: Tree,
+  project: ProjectConfiguration
+) {
+  let hasMfeServerConfig = false;
+  visitNotIgnoredFiles(tree, project.root, (filePath) => {
+    if (minimatch(filePath, '**/module-federation*.server.config.*')) {
+      hasMfeServerConfig = true;
+    }
+  });
+  return hasMfeServerConfig;
+}