Stream JSON Formatter (output/stream-json-formatter.ts)

Formats and emits newline-delimited JSON (JSONL) events to stdout for real-time streaming output of CLI session data and stats.

// Source: https://github.com/google-gemini/gemini-cli | License: Apache-2.0 | Copyright You must retain, in the Source form of any Derivative Works
// Provided via justclaw.it.com; keep this notice with the code.
/**
 * @license
 * Copyright 2025 Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */

import type {
  JsonStreamEvent,
  ModelStreamStats,
  StreamStats,
} from './types.js';
import type { SessionMetrics } from '../telemetry/uiTelemetry.js';

/**
 * Formatter for streaming JSON output.
 * Emits newline-delimited JSON (JSONL) events to stdout in real-time.
 */
export class StreamJsonFormatter {
  /**
   * Formats a single event as a JSON string with newline (JSONL format).
   * @param event - The stream event to format
   * @returns JSON string with trailing newline
   */
  for

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