type PreemptiveCompactionInput = {
    sessionID?: string;
    usage?: {
        inputTokens?: number;
        cacheReadTokens?: number;
        totalTokens?: number;
    };
    context?: {
        limitTokens?: number;
    };
    tokenUsage?: {
        input?: number;
        cacheRead?: number;
        total?: number;
    };
    contextLimit?: number;
};
type PreemptiveCompactionDeps = {
    threshold?: number;
    getTokenUsage?: (input: PreemptiveCompactionInput) => {
        usedTokens: number;
        contextLimit: number;
    } | undefined;
    compactSession?: (sessionID: string, info: {
        usageRatio: number;
        usedTokens: number;
        contextLimit: number;
    }) => void | Promise<void>;
};
export declare function createPreemptiveCompactionHandler(deps?: PreemptiveCompactionDeps): (input: PreemptiveCompactionInput) => Promise<void>;
export {};