refactor(@angular/cli): provide a default extract-i18n target for applications

The `extract-i18n` command will now use a default project target and builder
name if the target entry is not explicitly defined. This allows the removal
of additional configuration from an `angular.json` file. If the target is
already present than it will take priority over any default builder behavior.
Infrastructure is also now present to allow other architect commands to
have similar functionality in the future.

Author: clydin

packages/angular/cli/src/command-builder/architect-command-module.ts

@@ -6,6 +6,8 @@
  * found in the LICENSE file at https://angular.dev/license
  */
 
+import { Target } from '@angular-devkit/architect';
+import { workspaces } from '@angular-devkit/core';
 import { Argv } from 'yargs';
 import { getProjectByCwd } from '../utilities/config';
 import { memoize } from '../utilities/memoize';
@@ -28,7 +30,33 @@ export abstract class ArchitectCommandModule
 {
   abstract readonly multiTarget: boolean;
 
+  findDefaultBuilderName?(
+    project: workspaces.ProjectDefinition,
+    target: Target,
+  ): Promise<string | undefined>;
+
   async builder(argv: Argv): Promise<Argv<ArchitectCommandArgs>> {
+    const target = this.getArchitectTarget();
+
+    // Add default builder if target is not in project and a command default is provided
+    if (this.findDefaultBuilderName && this.context.workspace) {
+      for (const [project, projectDefinition] of this.context.workspace.projects) {
+        if (projectDefinition.targets.has(target)) {
+          continue;
+        }
+
+        const defaultBuilder = await this.findDefaultBuilderName(projectDefinition, {
+          project,
+          target,
+        });
+        if (defaultBuilder) {
+          projectDefinition.targets.set(target, {
+            builder: defaultBuilder,
+          });
+        }
+      }
+    }
+
     const project = this.getArchitectProject();
     const { jsonHelp, getYargsCompletions, help } = this.context.args.options;
 
@@ -60,7 +88,6 @@ export abstract class ArchitectCommandModule
       return localYargs;
     }
 
-    const target = this.getArchitectTarget();
     const schemaOptions = await this.getArchitectTargetOptions({
       project,
       target,

packages/angular/cli/src/commands/extract-i18n/cli.ts

@@ -6,6 +6,9 @@
  * found in the LICENSE file at https://angular.dev/license
  */
 
+import { workspaces } from '@angular-devkit/core';
+import { createRequire } from 'node:module';
+import { join } from 'node:path';
 import { ArchitectCommandModule } from '../../command-builder/architect-command-module';
 import { CommandModuleImplementation } from '../../command-builder/command-module';
 
@@ -17,4 +20,38 @@ export default class ExtractI18nCommandModule
   command = 'extract-i18n [project]';
   describe = 'Extracts i18n messages from source code.';
   longDescriptionPath?: string | undefined;
+
+  override async findDefaultBuilderName(
+    project: workspaces.ProjectDefinition,
+  ): Promise<string | undefined> {
+    // Only application type projects have a default i18n extraction target
+    if (project.extensions['projectType'] !== 'application') {
+      return;
+    }
+
+    const buildTarget = project.targets.get('build');
+    if (!buildTarget) {
+      // No default if there is no build target
+      return;
+    }
+
+    // Provide a default based on the defined builder for the 'build' target
+    switch (buildTarget.builder) {
+      case '@angular-devkit/build-angular:application':
+      case '@angular-devkit/build-angular:browser-esbuild':
+      case '@angular-devkit/build-angular:browser':
+        return '@angular-devkit/build-angular:extract-i18n';
+      case '@angular/build:application':
+        return '@angular/build:extract-i18n';
+    }
+
+    // For other builders, check for `@angular-devkit/build-angular` and use if found.
+    // This package is safer to use since it supports both application builder types.
+    try {
+      const projectRequire = createRequire(join(this.context.root, project.root) + '/');
+      projectRequire.resolve('@angular-devkit/build-angular');
+
+      return '@angular-devkit/build-angular:extract-i18n';
+    } catch {}
+  }
 }