Add JSON output for eval inventory (#28058)

scripts/eval-inventory-cli.ts

@@ -10,25 +10,40 @@
  * @fileoverview CLI entry point for the eval inventory command.
  *
  * Scans all eval source files, runs the static analyzer on each,
- * and prints a human-readable inventory report grouped by policy,
- * file, and suite.
+ * and prints an inventory report grouped by policy, file, and suite.
  *
  * Usage:
  *   npm run eval:inventory
+ *   npm run eval:inventory -- --json
  *   npm run eval:inventory -- --root /path/to/repo
+ *   npm run eval:inventory -- --root /path/to/repo --json
  */
 
 import {
   collectInventory,
+  formatInventoryJson,
   formatInventoryReport,
 } from './utils/eval-inventory.js';
 
 async function main() {
   const rootFlagIndex = process.argv.indexOf('--root');
-  const repoRoot =
-    rootFlagIndex !== -1 && process.argv[rootFlagIndex + 1]
-      ? process.argv[rootFlagIndex + 1]
-      : process.cwd();
+  const rootFlagValue =
+    rootFlagIndex !== -1 ? process.argv[rootFlagIndex + 1] : undefined;
+  if (rootFlagIndex !== -1 && rootFlagValue === undefined) {
+    console.error(
+      'Error: --root requires a directory path argument but none was provided.',
+    );
+    process.exit(1);
+  }
+  if (rootFlagValue && rootFlagValue.startsWith('--')) {
+    console.error(
+      `Error: --root value "${rootFlagValue}" looks like a flag. Provide a valid directory path.`,
+    );
+    process.exit(1);
+  }
+  const repoRoot = rootFlagValue ?? process.cwd();
+
+  const jsonMode = process.argv.includes('--json');
 
   const result = await collectInventory(repoRoot);
 
@@ -37,7 +52,9 @@ async function main() {
     process.exit(1);
   }
 
-  console.log(formatInventoryReport(result));
+  console.log(
+    jsonMode ? formatInventoryJson(result) : formatInventoryReport(result),
+  );
 }
 
 main().catch((error) => {