/**
 * HyDE Generator Agent: pure LLM agent for generating hypothetical documents
 * in the target corpus voice. Uses free-text lens labels instead of enum strategies.
 */
import type { BaseLanguageModelInput } from '@langchain/core/language_models/base';
import type { HydeSourceFrame } from './hyde.frame.js';
import type { HydeTargetCorpus } from './lens.inferrer.js';
export interface HydeGeneratorOutput {
    text: string;
}
export interface HydeGenerateInput {
    /** Original intent or query text. */
    sourceText: string;
    /** Free-text lens label from LensInferrer (e.g. "crypto infra VC"). */
    lens: string;
    /** Which corpus voice to generate in. */
    corpus: HydeTargetCorpus;
    /** Sanitized source-grounded frame. Absence preserves the exact legacy prompt. */
    sourceFrame?: HydeSourceFrame;
}
/** Minimal structured model contract used for deterministic injection in tests. */
export interface HydeGeneratorStructuredModel {
    invoke(input: BaseLanguageModelInput, config?: {
        signal?: AbortSignal;
    }): Promise<unknown>;
}
/** Build the frame-v1 generation prompt from sanitized source evidence. */
export declare function buildFrameHydePrompt(input: HydeGenerateInput & {
    sourceFrame: HydeSourceFrame;
}): string;
/** Generates hypothetical documents in a target corpus voice for semantic search. */
export declare class HydeGenerator {
    private model?;
    constructor(model?: HydeGeneratorStructuredModel);
    private getModel;
    /** Generate a hypothetical document for the given source text and lens. */
    generate(input: HydeGenerateInput): Promise<HydeGeneratorOutput>;
}