/**
 * @license
 * Copyright 2026 Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */
import { GenerateContentResponse, Part } from '@google/genai';
import { LlmResponse } from '../models/llm_response.js';
/**
 * Aggregates partial streaming responses.
 *
 * It aggregates content from partial responses, and generates LlmResponses for
 * individual (partial) model responses, as well as for aggregated content.
 */
export declare class StreamingResponseAggregator {
    private readonly isProgressiveMode;
    private usageMetadata?;
    private groundingMetadata?;
    private citationMetadata?;
    private response?;
    private finishReason?;
    private lastThoughtSignature;
    private readonly strategy;
    constructor(isProgressiveMode?: boolean);
    processResponse(response: GenerateContentResponse): AsyncGenerator<LlmResponse, void, void>;
    close(): LlmResponse | undefined;
}
/**
 * Checks if a response part has no meaningful content (empty text, no tool calls, etc.)
 */
export declare function isEmptyContentPart(part: Part): boolean;