clanker-agent/packages/ai/src/utils/json-parse.ts

import { parse as partialParse } from "partial-json";

/**
 * Attempts to parse potentially incomplete JSON during streaming.
 * Always returns a valid object, even if the JSON is incomplete.
 *
 * @param partialJson The partial JSON string from streaming
 * @returns Parsed object or empty object if parsing fails
 */
export function parseStreamingJson<T = any>(
  partialJson: string | undefined,
): T {
  if (!partialJson || partialJson.trim() === "") {
    return {} as T;
  }

  // Try standard parsing first (fastest for complete JSON)
  try {
    return JSON.parse(partialJson) as T;
  } catch {
    // Try partial-json for incomplete JSON
    try {
      const result = partialParse(partialJson);
      return (result ?? {}) as T;
    } catch {
      // If all parsing fails, return empty object
      return {} as T;
    }
  }
}