Sync upstream Gemini-CLI v0.8.2 (#838)

packages/core/src/output/json-formatter.ts

@@ -0,0 +1,39 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import stripAnsi from 'strip-ansi';
+import type { SessionMetrics } from '../telemetry/uiTelemetry.js';
+import type { JsonError, JsonOutput } from './types.js';
+
+export class JsonFormatter {
+  format(response?: string, stats?: SessionMetrics, error?: JsonError): string {
+    const output: JsonOutput = {};
+
+    if (response !== undefined) {
+      output.response = stripAnsi(response);
+    }
+
+    if (stats) {
+      output.stats = stats;
+    }
+
+    if (error) {
+      output.error = error;
+    }
+
+    return JSON.stringify(output, null, 2);
+  }
+
+  formatError(error: Error, code?: string | number): string {
+    const jsonError: JsonError = {
+      type: error.constructor.name,
+      message: stripAnsi(error.message),
+      ...(code && { code }),
+    };
+
+    return this.format(undefined, undefined, jsonError);
+  }
+}