export interface PollRetryBackoffOptions {
    /** Base delay before exponential growth (ms). */
    baseMs?: number;
    /** Maximum delay cap (ms). */
    maxMs?: number;
    /** Multiplier per attempt (1-based attempt index). */
    multiplier?: number;
    /** Random jitter fraction (0–1) applied to the computed delay. */
    jitterRatio?: number;
}
/**
 * True when a poll/fetch error should use server-overload backoff (G-45 / G-23-fe).
 */
export declare function isServerOverloadPollError(error: unknown): boolean;
/**
 * Exponential backoff with jitter for catalog poll / SWR retries on 5xx and 503.
 * Honors Retry-After when present on the error envelope.
 */
export declare function computePollRetryDelayMs(attemptIndex: number, error: unknown, options?: PollRetryBackoffOptions): number;
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