build(docs-infra): enable Ivy in StackBlitz examples (#40930)

We need to explicitly set the `enableIvy` option in a tsconfig file
to tell StackBlitz not to use ViewEngine.

This commit will generate an appropriate tsconfig.json file in the
example data that is sent to StackBlitz, which matches the Ivy
setting of the AIO project itself.

PR Close #40930

aio/tools/examples/shared/boilerplate/viewengine/cli/tsconfig.json

@@ -26,7 +26,6 @@
     "enableIvy": false,
     "strictInjectionParameters": true,
     "strictInputAccessModifiers": true,
-    // TODO(gkalpak): Fix the code and enable this (i.e. switch from `fullTemplateTypeCheck` to `strictTemplates`).
+    "strictTemplates": true
-    "fullTemplateTypeCheck": true,// "strictTemplates": true
   }
 }

aio/tools/stackblitz-builder/builder.js

@@ -5,6 +5,7 @@ const path = require('canonical-path');
 const fs = require('fs-extra');
 const globby = require('globby');
 const jsdom = require('jsdom');
+const json5 = require('json5');
 
 const regionExtractor = require('../transforms/examples-package/services/region-parser');
 
@@ -226,6 +227,18 @@ class StackblitzBuilder {
       postData[`files[${relativeFileName}]`] = content;
     });
 
+    // Stackblitz defaults to ViewEngine unless `"enableIvy": true`
+    // So if there is a tsconfig.json file and there is no `enableIvy` property, we need to
+    // explicitly set it.
+    const tsConfigJSON = postData['files[tsconfig.json]'];
+    if (tsConfigJSON !== undefined) {
+      const tsConfig = json5.parse(tsConfigJSON);
+      if (tsConfig.angularCompilerOptions.enableIvy === undefined) {
+        tsConfig.angularCompilerOptions.enableIvy = true;
+        postData['files[tsconfig.json]'] = JSON.stringify(tsConfig, null, 2);
+      }
+    }
+
     const tags = ['angular', 'example', ...config.tags || []];
     tags.forEach((tag, ix) => postData[`tags[${ix}]`] = tag);
 
@@ -263,7 +276,7 @@ class StackblitzBuilder {
     const config = this._parseConfig(configFileName);
 
     const defaultIncludes = ['**/*.ts', '**/*.js', '**/*.css', '**/*.html', '**/*.md', '**/*.json', '**/*.png', '**/*.svg'];
-    const boilerplateIncludes = ['src/environments/*.*', 'angular.json', 'src/polyfills.ts'];
+    const boilerplateIncludes = ['src/environments/*.*', 'angular.json', 'src/polyfills.ts', 'tsconfig.json'];
     if (config.files) {
       if (config.files.length > 0) {
         if (config.files[0][0] === '!') {
@@ -288,7 +301,6 @@ class StackblitzBuilder {
 
     const defaultExcludes = [
       '!**/e2e/**/*.*',
-      '!**/tsconfig.json',
       '!**/package.json',
       '!**/example-config.json',
       '!**/tslint.json',