aiMessageChunk.concat(aiMessageChunk)

function _mergeLists(left, right) {
  debugger;
  if (left === undefined && right === undefined) {
    return undefined;
  } else if (left === undefined || right === undefined) {
    return left || right;
  } else {
    const merged = [...left];
    for (const item of right) {
      console.log("Merging item:", item);
      if (
        typeof item === "object" &&
        "index" in item &&
        typeof item.index === "number"
      ) {
        const toMerge = merged.findIndex(
          (leftItem) => leftItem.index === item.index
        );
        if (toMerge !== -1) {
          merged[toMerge] = _mergeDicts(merged[toMerge], item);
        } else {
          merged.push(item);
        }
      } else if (
        typeof item === "object" &&
        "text" in item &&
        item.text === ""
      ) {
        // No-op - skip empty text blocks
        continue;
      } else {
        merged.push(item);
      }
    }
    return merged;
  }
}

function _mergeDicts(
  // eslint-disable-next-line @typescript-eslint/no-explicit-any
  left,
  // eslint-disable-next-line @typescript-eslint/no-explicit-any
  right
  // eslint-disable-next-line @typescript-eslint/no-explicit-any
) {
  debugger;
  const merged = { ...left };
  for (const [key, value] of Object.entries(right)) {
    if (merged[key] == null) {
      merged[key] = value;
    } else if (value == null) {
      continue;
    } else if (
      typeof merged[key] !== typeof value ||
      Array.isArray(merged[key]) !== Array.isArray(value)
    ) {
      throw new Error(
        `field[${key}] already exists in the message chunk, but with a different type.`
      );
    } else if (typeof merged[key] === "string") {
      if (key === "type") {
        // Do not merge 'type' fields
        continue;
      }
      merged[key] += value;
    } else if (typeof merged[key] === "object" && !Array.isArray(merged[key])) {
      merged[key] = _mergeDicts(merged[key], value);
    } else if (Array.isArray(merged[key])) {
      merged[key] = _mergeLists(merged[key], value);
    } else if (merged[key] === value) {
      continue;
    } else {
      console.warn(
        `field[${key}] already exists in this message chunk and value has unsupported type.`
      );
    }
  }
  return merged;
}

var left = {
  tool_calls: [
    {
      id: "call_50556714",
      function: "[Object]",
      index: 0,
      type: "function",
    },
  ],
};

var right = {
  tool_calls: [
    {
      id: "call_79113425",
      function: "[Object]",
      index: 0,
      type: "function",
    },
  ],
};
var merged = _mergeDicts(left, right);

console.log("Merged result:", merged);

/**
Merged result: {
  tool_calls: [
    {
      id: 'call_50556714call_79113425',
      function: '[Object][Object]',
      index: 0,
      type: 'function'
    }
  ]
}
 */