fix(material/schematics): don't interrupt ng add if adding the animations module fails (#28675)

In some custom scenarios adding the animations module can fail and the code that does it is outside of our control. These changes add some error handling so the rest of the schematic isn't interrupted.

Fixes #28640.

Author: crisbeto

src/material/schematics/BUILD.bazel

@@ -48,6 +48,7 @@ ts_library(
         # TODO(devversion): Only include jasmine for test sources (See: tsconfig types).
         "@npm//@types/jasmine",
         "@npm//@types/node",
+        "@npm//rxjs",
         "@npm//tslint",
         "@npm//typescript",
     ],

src/material/schematics/ng-add/setup-project.ts

@@ -6,11 +6,13 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {chain, noop, Rule, SchematicContext, Tree} from '@angular-devkit/schematics';
+import {chain, noop, Rule, SchematicContext, Tree, callRule} from '@angular-devkit/schematics';
 import {getProjectFromWorkspace, getProjectStyleFile} from '@angular/cdk/schematics';
 import {getWorkspace} from '@schematics/angular/utility/workspace';
 import {addRootProvider} from '@schematics/angular/utility';
 import {ProjectType} from '@schematics/angular/utility/workspace-models';
+import {of as observableOf} from 'rxjs';
+import {catchError} from 'rxjs/operators';
 import {addFontsToIndex} from './fonts/material-fonts';
 import {Schema} from './schema';
 import {addThemeToAppStyles, addTypographyClass} from './theming/theming';
@@ -28,14 +30,7 @@ export default function (options: Schema): Rule {
 
     if (project.extensions['projectType'] === ProjectType.Application) {
       return chain([
-        options.animations === 'excluded'
-          ? noop()
-          : addRootProvider(options.project, ({code, external}) => {
-              return code`${external(
-                'provideAnimationsAsync',
-                '@angular/platform-browser/animations/async',
-              )}(${options.animations === 'disabled' ? `'noop'` : ''})`;
-            }),
+        addAnimations(options),
         addThemeToAppStyles(options),
         addFontsToIndex(options),
         addMaterialAppStyles(options),
@@ -96,3 +91,32 @@ function addMaterialAppStyles(options: Schema) {
     host.commitUpdate(recorder);
   };
 }
+
+/** Adds the animations package to the project based on the conffiguration. */
+function addAnimations(options: Schema): Rule {
+  return (host: Tree, context: SchematicContext) => {
+    const animationsRule =
+      options.animations === 'excluded'
+        ? noop()
+        : addRootProvider(options.project, ({code, external}) => {
+            return code`${external(
+              'provideAnimationsAsync',
+              '@angular/platform-browser/animations/async',
+            )}(${options.animations === 'disabled' ? `'noop'` : ''})`;
+          });
+
+    // The `addRootProvider` rule can throw in some custom scenarios (see #28640).
+    // Add some error handling around it so the setup isn't interrupted.
+    return callRule(animationsRule, host, context).pipe(
+      catchError(() => {
+        context.logger.error(
+          'Failed to add animations to project. Continuing with the Angular Material setup.',
+        );
+        context.logger.info(
+          'Read more about setting up the animations manually: https://angular.io/guide/animations',
+        );
+        return observableOf(host);
+      }),
+    );
+  };
+}