/**
 * Usage of a rolling rate-limit window, as returned by Claude Code's own
 * `/usage` (endpoint GET /api/oauth/usage — a plain GET, it spends no quota).
 */
export interface Window {
    /** 0–100. */
    usedPercentage: number;
    /** Unix epoch seconds when the window resets, or null. */
    resetsAt: number | null;
}
export interface Usage {
    fiveHour: Window | null;
    sevenDay: Window | null;
    /** When this snapshot was fetched (ms since epoch). */
    fetchedAt: number;
}
export declare function parseWindow(w: any): Window | null;
/**
 * Fetches the current 5-hour and 7-day usage. Cached for 60s and
 * de-duplicated across concurrent callers, so polling is cheap.
 * Returns null if no token is available or the request fails.
 */
export declare function getUsage(): Promise<Usage | null>;