import type { UsageLog, UsageEvent, TrialState } from '../types/index.js';
export declare function getUsageLog(): Promise<UsageLog>;
export declare function appendUsageEvent(event: UsageEvent): Promise<void>;
export declare function rotateUsageLog(): Promise<void>;
export declare function getTrialState(): Promise<TrialState | null>;
export declare function ensureTrialState(): Promise<TrialState>;
export declare function getDailyCallCount(date: string): Promise<number>;
export declare function getLastCallTimestamp(): Promise<string | null>;
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