import type { FrictionLogOptions, FrictionLogReadResult, FrictionObservation } from './types.mts';
export declare const FRICTION_LOG_MAX_EVENTS = 500;
export declare function requireDirectory(directory: string): string;
export declare function eventLimit(maxEvents: number | undefined): number;
export declare function recordFriction(sessionId: string, observation: FrictionObservation, options: FrictionLogOptions & {
    timestamp?: string | (() => string);
}): void;
export declare function readFrictionLog(sessionId: string, options: FrictionLogOptions): FrictionLogReadResult;