/**
 * Cloudflare request budget (spec §F5).
 *
 * Cloudflare allows 1,200 API requests per user per rolling 5 minutes, shared
 * with the user's dashboard; going over blocks every API call for 5 minutes.
 * The default spends at most 900 per rolling 5 minutes (configurable 100 to
 * 1,100). A token bucket with capacity `burst` that refills at
 * `(limit − burst) / 300 s` never admits more than `limit` calls in any
 * 300-second window: at most `burst` from the full bucket plus the refill.
 * Local `--version` and `--dry-run` calls are free.
 */
export declare const DEFAULT_REQUESTS_PER_5MIN = 900;
export declare const MIN_REQUESTS_PER_5MIN = 100;
export declare const MAX_REQUESTS_PER_5MIN = 1100;
export declare const BUDGET_BURST = 8;
export declare const BUDGET_WINDOW_MS = 300000;
export type Clock = {
    now(): number;
    sleep(ms: number): Promise<void>;
};
export declare const systemClock: Clock;
export declare function parseRequestBudget(raw: string | undefined): number;
export declare class RequestBudget {
    readonly limit: number;
    private readonly clock;
    readonly burst: number;
    private tokens;
    private updatedAt;
    private readonly refillPerMs;
    private queue;
    constructor(limit?: number, clock?: Clock, burst?: number);
    private refill;
    /** Tokens available now (fractional). */
    available(): number;
    /** Wait for one request slot. Callers are served in order. */
    acquire(): Promise<void>;
    /** Seconds the bucket needs for `requests` calls, ignoring network latency. */
    estimateSeconds(requests: number): number;
}
/** Seconds a full bucket needs to admit `requests` calls at `limit` per 5 minutes. */
export declare function estimateBudgetSeconds(limit: number, requests: number, burst?: number): number;