chore(devkit): fix root when unit testing generators wrapped as schematics (#15506)

packages/devkit/src/utils/invoke-nx-generator.ts

@@ -104,7 +104,21 @@ class DevkitTreeFromAngularDevkitTree implements Tree {
     private tree,
     private _root: string,
     private skipWritingConfigInOldFormat?: boolean
-  ) {}
+  ) {
+    /**
+     * When using the UnitTestTree from @angular-devkit/schematics/testing, the root is just `/`.
+     * This causes a massive issue if `getProjects()` is used in the underlying generator because it
+     * causes fast-glob to be set to work on the user's entire file system.
+     *
+     * Therefore, in this case, patch the root to match what Nx Devkit does and use /virtual instead.
+     */
+    try {
+      const { UnitTestTree } = require('@angular-devkit/schematics/testing');
+      if (tree instanceof UnitTestTree && _root === '/') {
+        this._root = '/virtual';
+      }
+    } catch {}
+  }
 
   get root(): string {
     return this._root;

scripts/depcheck/missing.ts

@@ -55,7 +55,12 @@ const IGNORE_MATCHES_IN_PACKAGE = {
   ],
   cli: ['nx'],
   cypress: ['cypress', '@angular-devkit/schematics', '@nrwl/cypress', 'vite'],
-  devkit: ['@angular-devkit/architect', 'rxjs', 'webpack'],
+  devkit: [
+    '@angular-devkit/architect',
+    '@angular-devkit/schematics',
+    'rxjs',
+    'webpack',
+  ],
   'eslint-plugin-nx': ['@angular-eslint/eslint-plugin'],
   jest: [
     'jest',