import type { ObservationRepository } from "../db/observations";
import type { SessionRepository } from "../db/sessions";
import type { SummaryRepository } from "../db/summaries";
import type { UserObservationRepository } from "../db/user-memory";
import type { OpenMemConfig } from "../types";
/**
 * Factory for the `experimental.chat.system.transform` hook.
 *
 * Appends relevant past-session context (summaries + observation index)
 * to the system prompt within the configured token budget.
 *
 * The handler NEVER throws.
 */
export declare function createContextInjectionHook(config: OpenMemConfig, observations: ObservationRepository, sessions: SessionRepository, summaries: SummaryRepository, projectPath: string, userObservationRepo?: UserObservationRepository | null): (_input: {
    sessionID?: string;
    model: string;
}, output: {
    system: string[];
}) => Promise<void>;
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