export interface BackoffOptions {
    baseDelayMs: number;
    attempt: number;
    jitter?: boolean;
    /**
     * Upper bound (ms) applied to the exponential base delay BEFORE jitter.
     * Omit for an uncapped backoff.
     *
     * Capping before jitter (rather than after) keeps the result a true
     * fraction of the intended ceiling and, crucially, prevents
     * `baseDelayMs * 2 ** attempt` from overflowing to Infinity at high attempt
     * counts — important for callers that retry forever (e.g. ws-reconnect with
     * maxRetries = Infinity).
     */
    maxDelayMs?: number;
}
export declare function calculateBackoff(options: BackoffOptions): number;
export interface RetryOptions {
    maxRetries: number;
    baseDelayMs: number;
}
export declare class RetryStrategy {
    private readonly options;
    constructor(options: RetryOptions);
    shouldRetry(error: unknown): boolean;
    withRetry<T>(fn: () => Promise<T>): Promise<T>;
}
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