test: add integration test for lazy chunks and ngDevMode in cli apps (#32957)

PR Close #32957

integration/cli-hello-world-lazy/check-output-for-ngdevmode.js

@@ -0,0 +1,15 @@
+const fs = require('fs');
+const path = require('path');
+
+const distPath = './dist/';
+const ngDevModeVariable = 'ngDevMode';
+
+const filesWithNgDevMode = fs.readdirSync(distPath)
+  .filter(p => p.endsWith('.js'))
+  .filter(p => fs.readFileSync(path.join(distPath, p), 'utf-8').includes(ngDevModeVariable));
+
+if (filesWithNgDevMode.length > 0) {
+  throw new Error(`Found '${ngDevModeVariable}' referenced in ${filesWithNgDevMode}. These references should be tree-shaken away!`);
+} else {
+  console.log(`No '${ngDevModeVariable}' references found in ${distPath}`)
+}