export interface UsageWindow {
    readonly utilization: number;
    readonly resetsAt?: Date;
}
export interface UsageSnapshot {
    readonly kind: 'ok';
    readonly fiveHour?: UsageWindow;
    readonly sevenDay?: UsageWindow;
    readonly sevenDaySonnet?: UsageWindow;
    readonly sevenDayOpus?: UsageWindow;
}
export type UsageUnavailableReason = 'no-token' | 'http-error' | 'malformed-response' | 'timeout' | 'network-error';
export interface UsageUnavailable {
    readonly kind: 'unavailable';
    readonly reason: UsageUnavailableReason;
    readonly detail: string;
}
export type UsageResult = UsageSnapshot | UsageUnavailable;
export interface FetchSubscriptionUsageOptions {
    readonly fetchImpl?: typeof fetch;
    readonly token?: string;
    readonly timeoutMs?: number;
}
export declare function fetchSubscriptionUsage(options?: FetchSubscriptionUsageOptions): Promise<UsageResult>;
export declare function formatUsagePlain(result: UsageResult): string;