export interface RetryOptions {
    attempts: number;
    baseDelayMs: number;
    maxDelayMs: number;
    jitter: number;
    shouldRetry?: (err: unknown, attempt: number) => boolean;
    onRetry?: (err: unknown, attempt: number, delayMs: number) => void;
    signal?: AbortSignal;
    sleep?: (ms: number, signal?: AbortSignal) => Promise<void>;
    random?: () => number;
}
export declare function retry<T>(fn: () => Promise<T>, opts?: Partial<RetryOptions>): Promise<T>;
export declare function backoffDelay(attempt: number, cfg: {
    baseDelayMs: number;
    maxDelayMs: number;
    jitter: number;
}, random?: () => number): number;
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