fix(angular): should support filereplacements for apps that already have them

packages/angular/src/generators/setup-ssr/__snapshots__/setup-ssr.spec.ts.snap

@@ -84,3 +84,31 @@ if (moduleFilename === __filename || moduleFilename.includes('iisnode')) {
 
 export * from './src/main.server';"
 `;
+
+exports[`setupSSR should use fileReplacements if they already exist 1`] = `
+Object {
+  "configurations": Object {
+    "development": Object {
+      "extractLicenses": false,
+      "optimization": false,
+      "sourceMap": true,
+    },
+    "production": Object {
+      "fileReplacements": Array [
+        Object {
+          "replace": "apps/app1/src/environments/environment.ts",
+          "with": "apps/app1/src/environments/environment.prod.ts",
+        },
+      ],
+      "outputHashing": "media",
+    },
+  },
+  "defaultConfiguration": "production",
+  "executor": "@angular-devkit/build-angular:server",
+  "options": Object {
+    "main": "apps/app1/server.ts",
+    "outputPath": "dist/apps/app1/server",
+    "tsConfig": "apps/app1/tsconfig.server.json",
+  },
+}
+`;

packages/angular/src/generators/setup-ssr/lib/update-project-config.ts

@@ -11,6 +11,9 @@ export function updateProjectConfig(tree: Tree, schema: Schema) {
 
   projectConfig.targets.build.options.outputPath = `dist/apps/${schema.project}/browser`;
 
+  const buildTargetFileReplacements =
+    projectConfig.targets.build.configurations?.production?.fileReplacements;
+
   projectConfig.targets.server = {
     executor: '@angular-devkit/build-angular:server',
     options: {
@@ -21,6 +24,9 @@ export function updateProjectConfig(tree: Tree, schema: Schema) {
     configurations: {
       production: {
         outputHashing: 'media',
+        ...(buildTargetFileReplacements
+          ? { fileReplacements: buildTargetFileReplacements }
+          : {}),
       },
       development: {
         optimization: false,

packages/angular/src/generators/setup-ssr/setup-ssr.spec.ts

@@ -1,4 +1,8 @@
-import { readJson, readProjectConfiguration } from '@nrwl/devkit';
+import {
+  readJson,
+  readProjectConfiguration,
+  updateProjectConfiguration,
+} from '@nrwl/devkit';
 import { createTreeWithEmptyWorkspace } from '@nrwl/devkit/testing';
 import { PackageJson } from 'nx/src/utils/package-json';
 import { angularVersion, ngUniversalVersion } from '../../utils/versions';
@@ -126,4 +130,32 @@ describe('setupSSR', () => {
       expect(packageJson.devDependencies[dep]).toEqual(version);
     }
   });
+
+  it('should use fileReplacements if they already exist', async () => {
+    // ARRANGE
+    const tree = createTreeWithEmptyWorkspace();
+
+    await applicationGenerator(tree, {
+      name: 'app1',
+    });
+
+    tree.write('apps/app1/src/environments/environment.ts', '');
+    tree.write('apps/app1/src/environments/environment.prod.ts', '');
+    const project = readProjectConfiguration(tree, 'app1');
+    project.targets.build.configurations.production.fileReplacements = [
+      {
+        replace: 'apps/app1/src/environments/environment.ts',
+        with: 'apps/app1/src/environments/environment.prod.ts',
+      },
+    ];
+    updateProjectConfiguration(tree, 'app1', project);
+
+    // ACT
+    await setupSsr(tree, { project: 'app1' });
+
+    // ASSERT
+    expect(
+      readProjectConfiguration(tree, 'app1').targets.server
+    ).toMatchSnapshot();
+  });
 });