fix(ng-update): better detection for workspace project in v9 hammer migration

Currently the v9 HammerJS migration determines the workspace project by
consulting the `ts.Program` that has been constructed. This logic is not
guaranteed to work because a TypeScript program doesn't necessarily need
to contain any "root" file names. This means that we cannot reliably
determine the workspace project from the `ts.Program` and we will throw
an error that no project could be found.

We can improve this logic by simply using the workspace project that is
associated with the originating tsconfig file. This was previously not
possible, but 411d048 enabled us to
pass through the workspace project.

Fixes #18504.

Author: devversion

src/cdk/schematics/update-tool/index.ts

@@ -50,8 +50,8 @@ export function runMigrationRules<T>(
   // Create instances of all specified migration rules.
   for (const ruleCtor of ruleTypes) {
     const rule = new ruleCtor(
-        program, typeChecker, targetVersion, upgradeData, tree, getUpdateRecorder, basePath, logger,
-        isTestTarget, tsconfigPath);
+        project, program, typeChecker, targetVersion, upgradeData, tree, getUpdateRecorder,
+        basePath, logger, isTestTarget, tsconfigPath);
     rule.init();
     if (rule.ruleEnabled) {
       rules.push(rule);

src/cdk/schematics/update-tool/migration-rule.ts

@@ -8,6 +8,7 @@
 
 import {logging} from '@angular-devkit/core';
 import {SchematicContext, Tree, UpdateRecorder} from '@angular-devkit/schematics';
+import {WorkspaceProject} from '@schematics/angular/utility/workspace-models';
 import * as ts from 'typescript';
 import {ResolvedResource} from './component-resource-collector';
 import {TargetVersion} from './target-version';
@@ -32,6 +33,8 @@ export class MigrationRule<T> {
   ruleEnabled = true;
 
   constructor(
+      /** Workspace project the migration rule runs against. */
+      public project: WorkspaceProject,
       /** TypeScript program for the migration. */
       public program: ts.Program,
       /** TypeChecker instance for the analysis program. */

src/material/schematics/ng-update/test-cases/v9/misc/hammer-migration-v9.spec.ts

@@ -38,6 +38,24 @@ describe('v9 HammerJS removal', () => {
     `);
   }
 
+  it('should not throw if project tsconfig does not have explicit root file names', async () => {
+    // Generates a second project in the workspace. This is necessary to ensure that the
+    // migration runs logic to determine the correct workspace project.
+    await runner.runExternalSchematicAsync(
+        '@schematics/angular', 'application', {name: 'second-project'}, tree).toPromise();
+    // Overwrite the default tsconfig to not specify any explicit source files. This replicates
+    // the scenario observed in: https://github.com/angular/components/issues/18504.
+    writeFile('/projects/cdk-testing/tsconfig.app.json', JSON.stringify({
+      extends: '../../tsconfig.json',
+      compilerOptions: {
+        outDir: '../../out-tsc/app',
+        types: []
+      }}
+    ));
+    addPackageToPackageJson(tree, 'hammerjs', '0.0.0');
+    await expectAsync(runMigration()).not.toBeRejected();
+  });
+
   describe('hammerjs not used', () => {
     it('should remove hammerjs from "package.json" file', async () => {
       addPackageToPackageJson(tree, 'hammerjs', '0.0.0');

src/material/schematics/ng-update/upgrade-rules/hammer-gestures-v9/cli-workspace.ts

@@ -11,7 +11,7 @@ import {
   normalize as devkitNormalize,
   Path as DevkitPath
 } from '@angular-devkit/core';
-import {SchematicContext, SchematicsException, Tree} from '@angular-devkit/schematics';
+import {SchematicContext, Tree} from '@angular-devkit/schematics';
 import {
   getImportOfIdentifier,
   getProjectIndexFiles,
@@ -27,13 +27,11 @@ import {
   getMetadataField
 } from '@angular/cdk/schematics';
 import {InsertChange} from '@schematics/angular/utility/change';
-import {getWorkspace} from '@schematics/angular/utility/config';
 import {WorkspaceProject} from '@schematics/angular/utility/workspace-models';
 import {readFileSync} from 'fs';
 import {dirname, join, relative} from 'path';
 import * as ts from 'typescript';
 
-import {getProjectFromProgram} from './cli-workspace';
 import {findHammerScriptImportElements} from './find-hammer-script-tags';
 import {findMainModuleExpression} from './find-main-module';
 import {isHammerJsUsedInTemplate} from './hammer-template-check';
@@ -242,8 +240,7 @@ export class HammerGesturesRule extends MigrationRule<null> {
    *   4) Setup the "HammerModule" in the root app module (if not done already).
    */
   private _setupHammerWithCustomEvents() {
-    const project = this._getProjectOrThrow();
-    const sourceRoot = devkitNormalize(project.sourceRoot || project.root);
+    const sourceRoot = devkitNormalize(this.project.sourceRoot || this.project.root);
     const newConfigPath =
         devkitJoin(sourceRoot, this._getAvailableGestureConfigFileName(sourceRoot));
 
@@ -261,20 +258,18 @@ export class HammerGesturesRule extends MigrationRule<null> {
     // Setup the gesture config provider and the "HammerModule" in the root module
     // if not done already. The "HammerModule" is needed in v9 since it enables the
     // Hammer event plugin that was previously enabled by default in v8.
-    this._setupNewGestureConfigInRootModule(project, newConfigPath);
-    this._setupHammerModuleInRootModule(project);
+    this._setupNewGestureConfigInRootModule(newConfigPath);
+    this._setupHammerModuleInRootModule();
   }
 
   /**
    * Sets up the standard hammer module in the project and removes all
    * references to the deprecated Angular Material gesture config.
    */
   private _setupHammerWithStandardEvents() {
-    const project = this._getProjectOrThrow();
-
     // Setup the HammerModule. The HammerModule enables support for
     // the standard HammerJS events.
-    this._setupHammerModuleInRootModule(project);
+    this._setupHammerModuleInRootModule();
     this._removeMaterialGestureConfigSetup();
   }
 
@@ -285,13 +280,11 @@ export class HammerGesturesRule extends MigrationRule<null> {
    *   3) Remove "hammerjs" from all index HTML files of the current project.
    */
   private _removeHammerSetup() {
-    const project = this._getProjectOrThrow();
-
     this._installImports.forEach(i => this._importManager.deleteImportByDeclaration(i));
 
     this._removeMaterialGestureConfigSetup();
     this._removeHammerModuleReferences();
-    this._removeHammerFromIndexFile(project);
+    this._removeHammerFromIndexFile(this.project);
   }
 
   /**
@@ -645,8 +638,8 @@ export class HammerGesturesRule extends MigrationRule<null> {
   }
 
   /** Sets up the Hammer gesture config in the root module if needed. */
-  private _setupNewGestureConfigInRootModule(project: WorkspaceProject, gestureConfigPath: string) {
-    const mainFilePath = join(this.basePath, getProjectMainFile(project));
+  private _setupNewGestureConfigInRootModule(gestureConfigPath: string) {
+    const mainFilePath = join(this.basePath, getProjectMainFile(this.project));
     const rootModuleSymbol = this._getRootModuleSymbol(mainFilePath);
 
     if (rootModuleSymbol === null) {
@@ -722,8 +715,8 @@ export class HammerGesturesRule extends MigrationRule<null> {
   }
 
   /** Sets up the "HammerModule" in the root module of the project. */
-  private _setupHammerModuleInRootModule(project: WorkspaceProject) {
-    const mainFilePath = join(this.basePath, getProjectMainFile(project));
+  private _setupHammerModuleInRootModule() {
+    const mainFilePath = join(this.basePath, getProjectMainFile(this.project));
     const rootModuleSymbol = this._getRootModuleSymbol(mainFilePath);
 
     if (rootModuleSymbol === null) {
@@ -820,23 +813,6 @@ export class HammerGesturesRule extends MigrationRule<null> {
     });
   }
 
-  /**
-   * Gets the project from the current program or throws if no project
-   * could be found.
-   */
-  private _getProjectOrThrow(): WorkspaceProject {
-    const workspace = getWorkspace(this.tree);
-    const project = getProjectFromProgram(workspace, this.program);
-
-    if (!project) {
-      throw new SchematicsException(
-          'Could not find project to perform HammerJS v9 migration. ' +
-          'Please ensure your workspace configuration defines a project.');
-    }
-
-    return project;
-  }
-
   /** Global state of whether Hammer is used in any analyzed project target. */
   static globalUsesHammer = false;