import type { RateLimiter, RateLimiterCheck } from "@promobase/sdk-runtime";
export interface MetaRateLimiterOptions {
    /** Pause requests when usage exceeds this threshold (0-1). Default: 0.9 */
    highWaterMark?: number;
    /** Fallback wait time in ms when over high water mark. Default: 60000 */
    fallbackWaitMs?: number;
    /** Called when rate limited. Informational only. */
    onThrottle?: (info: {
        waitMs: number;
        usage: MetaUsage;
    }) => void;
}
export interface MetaUsage {
    callCount: number;
    cpuTime: number;
    totalTime: number;
}
export declare class MetaRateLimiter implements RateLimiter {
    private usage;
    private pausedUntil;
    private readonly highWaterMark;
    private readonly fallbackWaitMs;
    private readonly onThrottle?;
    constructor(opts?: MetaRateLimiterOptions);
    check(): RateLimiterCheck;
    afterResponse(status: number, headers: Headers): void;
    /** Get current usage snapshot. */
    getUsage(): MetaUsage;
    /** Check if currently paused. */
    get isPaused(): boolean;
    /** Get pause end timestamp (0 if not paused). */
    get pausedUntilTimestamp(): number;
    /** Manually reset all state. */
    reset(): void;
}
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