import type { HmemConfig } from '../hmem-config.js';
import type { SummarizeFn } from './types.js';
/**
 * Choose the segment summarizer. Real Haiku is opt-in (checkpointMode='auto') so unit
 * tests with DEFAULT_CONFIG never hit the network even when ANTHROPIC_API_KEY is set.
 * OpenAI provider has no adapter yet → falls back (TODO Phase 6+).
 */
export declare function pickSummarizer(config: HmemConfig): SummarizeFn;