feat(@angular/ssr): move CommonEngine API to /node entry-point

Refactored the `CommonEngine` API import path to remove Node.js dependencies from the `@angular/ssr` main entry-point.

BREAKING CHANGE:

The `CommonEngine` API now needs to be imported from `@angular/ssr/node`.

**Before**
```ts
import { CommonEngine } from '@angular/ssr';
```

**After**
```ts
import { CommonEngine } from '@angular/ssr/node';
```

goldens/public-api/angular/ssr/index.api.md

@@ -4,37 +4,6 @@
 
 ```ts
 
-import { ApplicationRef } from '@angular/core';
-import { StaticProvider } from '@angular/core';
-import { Type } from '@angular/core';
-
-// @public
-export class CommonEngine {
-    constructor(options?: CommonEngineOptions | undefined);
-    render(opts: CommonEngineRenderOptions): Promise<string>;
-}
-
-// @public (undocumented)
-export interface CommonEngineOptions {
-    bootstrap?: Type<{}> | (() => Promise<ApplicationRef>);
-    enablePerformanceProfiler?: boolean;
-    providers?: StaticProvider[];
-}
-
-// @public (undocumented)
-export interface CommonEngineRenderOptions {
-    bootstrap?: Type<{}> | (() => Promise<ApplicationRef>);
-    // (undocumented)
-    document?: string;
-    // (undocumented)
-    documentFilePath?: string;
-    inlineCriticalCss?: boolean;
-    providers?: StaticProvider[];
-    publicPath?: string;
-    // (undocumented)
-    url?: string;
-}
-
 // (No @packageDocumentation comment for this package)
 
 ```

goldens/public-api/angular/ssr/node/index.api.md

@@ -0,0 +1,40 @@
+## API Report File for "@angular/ssr_node"
+
+> Do not edit this file. It is a report generated by [API Extractor](https://api-extractor.com/).
+
+```ts
+
+import { ApplicationRef } from '@angular/core';
+import { StaticProvider } from '@angular/core';
+import { Type } from '@angular/core';
+
+// @public
+export class CommonEngine {
+    constructor(options?: CommonEngineOptions | undefined);
+    render(opts: CommonEngineRenderOptions): Promise<string>;
+}
+
+// @public (undocumented)
+export interface CommonEngineOptions {
+    bootstrap?: Type<{}> | (() => Promise<ApplicationRef>);
+    enablePerformanceProfiler?: boolean;
+    providers?: StaticProvider[];
+}
+
+// @public (undocumented)
+export interface CommonEngineRenderOptions {
+    bootstrap?: Type<{}> | (() => Promise<ApplicationRef>);
+    // (undocumented)
+    document?: string;
+    // (undocumented)
+    documentFilePath?: string;
+    inlineCriticalCss?: boolean;
+    providers?: StaticProvider[];
+    publicPath?: string;
+    // (undocumented)
+    url?: string;
+}
+
+// (No @packageDocumentation comment for this package)
+
+```

packages/angular/ssr/BUILD.bazel

@@ -44,6 +44,7 @@ ng_package(
     tags = ["release-package"],
     deps = [
         ":ssr",
+        "//packages/angular/ssr/node",
     ],
 )
 

packages/angular/ssr/node/BUILD.bazel

@@ -0,0 +1,20 @@
+load("//tools:defaults.bzl", "ts_library")
+
+package(default_visibility = ["//visibility:public"])
+
+ts_library(
+    name = "node",
+    srcs = glob(
+        [
+            "*.ts",
+            "src/**/*.ts",
+        ],
+    ),
+    module_name = "@angular/ssr/node",
+    deps = [
+        "//packages/angular/ssr",
+        "@npm//@angular/core",
+        "@npm//@angular/platform-server",
+        "@npm//@types/node",
+    ],
+)

packages/angular/ssr/node/index.ts

@@ -0,0 +1,9 @@
+/**
+ * @license
+ * Copyright Google LLC All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.dev/license
+ */
+
+export * from './public_api';

packages/angular/ssr/node/public_api.ts

@@ -0,0 +1,13 @@
+/**
+ * @license
+ * Copyright Google LLC All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.dev/license
+ */
+
+export {
+  CommonEngine,
+  type CommonEngineRenderOptions,
+  type CommonEngineOptions,
+} from './src/common-engine/common-engine';

packages/angular/ssr/src/common-engine/inline-css-processor.ts → packages/angular/ssr/node/src/common-engine/inline-css-processor.ts

@@ -6,8 +6,8 @@
  * found in the LICENSE file at https://angular.dev/license
  */
 
+import { ɵInlineCriticalCssProcessor as InlineCriticalCssProcessor } from '@angular/ssr';
 import { readFile } from 'node:fs/promises';
-import { InlineCriticalCssProcessor } from '../utils/inline-critical-css';
 
 export class CommonEngineInlineCriticalCssProcessor {
   private readonly resourceCache = new Map<string, string>();

packages/angular/ssr/private_export.ts

@@ -16,3 +16,5 @@ export {
   setAngularAppManifest as ɵsetAngularAppManifest,
   setAngularAppEngineManifest as ɵsetAngularAppEngineManifest,
 } from './src/manifest';
+
+export { InlineCriticalCssProcessor as ɵInlineCriticalCssProcessor } from './src/utils/inline-critical-css';

packages/angular/ssr/public_api.ts

@@ -6,10 +6,4 @@
  * found in the LICENSE file at https://angular.dev/license
  */
 
-export {
-  CommonEngine,
-  type CommonEngineRenderOptions,
-  type CommonEngineOptions,
-} from './src/common-engine/common-engine';
-
 export * from './private_export';

packages/angular_devkit/build_angular/BUILD.bazel

@@ -365,7 +365,7 @@ LARGE_SPECS = {
             "@npm//browser-sync",
             "@npm//express",
             "@npm//undici",
-            "//packages/angular/ssr",
+            "//packages/angular/ssr/node",
         ],
     },
 }

packages/angular_devkit/build_angular/src/builders/ssr-dev-server/specs/proxy_spec.ts

@@ -25,7 +25,7 @@ describe('Serve SSR Builder', () => {
       'src/main.server.ts': `
         import 'zone.js/node';
 
-        import { CommonEngine } from '@angular/ssr';
+        import { CommonEngine } from '@angular/ssr/node';
         import * as express from 'express';
         import { resolve, join } from 'node:path';
         import { AppServerModule } from './app/app.module.server';

packages/angular_devkit/build_angular/src/builders/ssr-dev-server/specs/ssl_spec.ts

@@ -25,7 +25,7 @@ describe('Serve SSR Builder', () => {
       'src/main.server.ts': `
         import 'zone.js/node';
 
-        import { CommonEngine } from '@angular/ssr';
+        import { CommonEngine } from '@angular/ssr/node';
         import * as express from 'express';
         import { resolve, join } from 'node:path';
         import { AppServerModule } from './app/app.module.server';

packages/angular_devkit/build_angular/src/builders/ssr-dev-server/specs/works_spec.ts

@@ -24,7 +24,7 @@ describe('Serve SSR Builder', () => {
       'src/main.server.ts': `
       import 'zone.js/node';
 
-      import { CommonEngine } from '@angular/ssr';
+      import { CommonEngine } from '@angular/ssr/node';
       import * as express from 'express';
       import { resolve, join } from 'node:path';
       import { AppServerModule } from './app/app.module.server';

packages/schematics/angular/migrations/migration-collection.json

@@ -11,6 +11,11 @@
       "version": "19.0.0",
       "factory": "./update-workspace-config/migration",
       "description": "Update the workspace configuration by replacing deprecated options in 'angular.json' for compatibility with the latest Angular CLI changes."
+    },
+    "update-ssr-imports": {
+      "version": "19.0.0",
+      "factory": "./update-ssr-imports/migration",
+      "description": "Update '@angular/ssr' import paths to use the new '/node' entry point when 'CommonEngine' is detected."
     }
   }
 }

packages/schematics/angular/migrations/update-ssr-imports/migration.ts

@@ -0,0 +1,92 @@
+/**
+ * @license
+ * Copyright Google LLC All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.dev/license
+ */
+
+import { DirEntry, Rule, UpdateRecorder } from '@angular-devkit/schematics';
+import * as ts from '../../third_party/github.com/Microsoft/TypeScript/lib/typescript';
+
+function* visit(directory: DirEntry): IterableIterator<ts.SourceFile> {
+  for (const path of directory.subfiles) {
+    if (path.endsWith('.ts') && !path.endsWith('.d.ts')) {
+      const entry = directory.file(path);
+      if (entry) {
+        const content = entry.content;
+        if (content.includes('CommonEngine') && !content.includes('@angular/ssr/node')) {
+          const source = ts.createSourceFile(
+            entry.path,
+            content.toString().replace(/^\uFEFF/, ''),
+            ts.ScriptTarget.Latest,
+            true,
+          );
+
+          yield source;
+        }
+      }
+    }
+  }
+
+  for (const path of directory.subdirs) {
+    if (path === 'node_modules' || path.startsWith('.')) {
+      continue;
+    }
+
+    yield* visit(directory.dir(path));
+  }
+}
+
+/**
+ * Schematics rule that identifies and updates import declarations in TypeScript files.
+ * Specifically, it modifies imports of '@angular/ssr' by appending '/node' if the
+ * `CommonEngine` is used from the old entry point.
+ *
+ */
+export default function (): Rule {
+  return (tree) => {
+    for (const sourceFile of visit(tree.root)) {
+      let recorder: UpdateRecorder | undefined;
+
+      const allImportDeclarations = sourceFile.statements.filter((n) => ts.isImportDeclaration(n));
+      if (allImportDeclarations.length === 0) {
+        continue;
+      }
+
+      const ssrImports = allImportDeclarations.filter(
+        (n) => ts.isStringLiteral(n.moduleSpecifier) && n.moduleSpecifier.text === '@angular/ssr',
+      );
+      for (const ssrImport of ssrImports) {
+        const ssrNamedBinding = getNamedImports(ssrImport);
+        if (ssrNamedBinding) {
+          const isUsingOldEntryPoint = ssrNamedBinding.elements.some((e) =>
+            e.name.text.startsWith('CommonEngine'),
+          );
+
+          if (!isUsingOldEntryPoint) {
+            continue;
+          }
+
+          recorder ??= tree.beginUpdate(sourceFile.fileName);
+          recorder.insertRight(ssrImport.moduleSpecifier.getEnd() - 1, '/node');
+        }
+      }
+
+      if (recorder) {
+        tree.commitUpdate(recorder);
+      }
+    }
+  };
+}
+
+function getNamedImports(
+  importDeclaration: ts.ImportDeclaration | undefined,
+): ts.NamedImports | undefined {
+  const namedBindings = importDeclaration?.importClause?.namedBindings;
+  if (namedBindings && ts.isNamedImports(namedBindings)) {
+    return namedBindings;
+  }
+
+  return undefined;
+}

packages/schematics/angular/migrations/update-ssr-imports/migration_spec.ts

@@ -0,0 +1,67 @@
+/**
+ * @license
+ * Copyright Google LLC All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.dev/license
+ */
+
+import { tags } from '@angular-devkit/core';
+import { EmptyTree } from '@angular-devkit/schematics';
+import { SchematicTestRunner, UnitTestTree } from '@angular-devkit/schematics/testing';
+
+describe('CommonEngine migration', () => {
+  const schematicRunner = new SchematicTestRunner(
+    'migrations',
+    require.resolve('../migration-collection.json'),
+  );
+
+  let tree: UnitTestTree;
+  beforeEach(() => {
+    tree = new UnitTestTree(new EmptyTree());
+  });
+
+  function runMigration(): Promise<UnitTestTree> {
+    return schematicRunner.runSchematic('update-ssr-imports', {}, tree);
+  }
+
+  it(`should replace 'CommonEngine*' imports from '@angular/ssr' to '@angular/ssr/node'`, async () => {
+    tree.create(
+      '/index.ts',
+      tags.stripIndents`
+      import { CommonEngine } from '@angular/ssr';
+      import type { CommonEngineOptions, CommonEngineRenderOptions } from '@angular/ssr';
+    `,
+    );
+
+    const newTree = await runMigration();
+    expect(newTree.readContent('/index.ts')).toBe(tags.stripIndents`
+      import { CommonEngine } from '@angular/ssr/node';
+      import type { CommonEngineOptions, CommonEngineRenderOptions } from '@angular/ssr/node';
+    `);
+  });
+
+  it(`should not replace 'CommonEngine*' imports from '@angular/ssr/node'`, async () => {
+    const input = tags.stripIndents`
+    import { CommonEngine } from '@angular/ssr/node';
+    import type { CommonEngineOptions, CommonEngineRenderOptions } from '@angular/ssr/node';
+  `;
+
+    tree.create('/index.ts', input);
+
+    const newTree = await runMigration();
+    expect(newTree.readContent('/index.ts')).toBe(input);
+  });
+
+  it(`should not replace 'CommonEngine*' imports from other package`, async () => {
+    const input = tags.stripIndents`
+    import { CommonEngine } from 'unknown';
+    import type { CommonEngineOptions, CommonEngineRenderOptions } from 'unknown';
+  `;
+
+    tree.create('/index.ts', input);
+
+    const newTree = await runMigration();
+    expect(newTree.readContent('/index.ts')).toBe(input);
+  });
+});

packages/schematics/angular/ssr/files/application-builder/server.ts.template

@@ -1,5 +1,5 @@
 import { APP_BASE_HREF } from '@angular/common';
-import { CommonEngine } from '@angular/ssr';
+import { CommonEngine } from '@angular/ssr/node';
 import express from 'express';
 import { fileURLToPath } from 'node:url';
 import { dirname, join, resolve } from 'node:path';

packages/schematics/angular/ssr/files/server-builder/server.ts.template

@@ -1,7 +1,7 @@
 import 'zone.js/node';
 
 import { APP_BASE_HREF } from '@angular/common';
-import { CommonEngine } from '@angular/ssr';
+import { CommonEngine } from '@angular/ssr/node';
 import * as express from 'express';
 import { existsSync } from 'node:fs';
 import { join } from 'node:path';

tests/legacy-cli/e2e/assets/19-ssr-project-webpack/server.ts

@@ -1,7 +1,7 @@
 import 'zone.js/node';
 
 import { APP_BASE_HREF } from '@angular/common';
-import { CommonEngine } from '@angular/ssr';
+import { CommonEngine } from '@angular/ssr/node';
 import * as express from 'express';
 import { existsSync } from 'node:fs';
 import { join } from 'node:path';