import { generateText } from "ai";
import type { Observation } from "../types";
import { type ParsedSummary } from "./parser";
/** Configuration for the AI session summarizer. */
export interface SummarizerConfig {
    provider: string;
    apiKey: string | undefined;
    model: string;
    maxTokensPerCompression: number;
    compressionEnabled: boolean;
    rateLimitingEnabled: boolean;
    fallbackProviders?: string[];
}
/**
 * Generates a concise summary of a coding session from its observations.
 * Falls back to a heuristic aggregation when the API is unavailable.
 */
export declare class SessionSummarizer {
    private model;
    private config;
    _generate: typeof generateText;
    constructor(config: SummarizerConfig);
    /**
     * Summarize a session's observations via the AI provider.
     * Returns `null` for empty observation lists, falls back to heuristic
     * summary when the API is disabled or errors out.
     */
    summarize(sessionId: string, observations: ReadonlyArray<Observation>): Promise<ParsedSummary | null>;
    /**
     * Build a summary by aggregating observation metadata — no AI required.
     */
    createFallbackSummary(observations: ReadonlyArray<Observation>): ParsedSummary;
    /** Whether a session has enough observations to warrant summarization */
    shouldSummarize(observationCount: number): boolean;
}
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