/** The deadline passed without `fn` producing a result. Distinct from `fn` itself
 * failing, so callers can tell "nobody clicked the link" from "the backend errored". */
export declare class PollTimeoutError extends Error {
    constructor(message?: string);
}
export interface PollOptions {
    intervalMs?: number;
    timeoutMs?: number;
    /**
     * How many CONSECUTIVE `fn` throws to tolerate before giving up by rethrowing the
     * last one. Defaults to 0 — the historical behavior where the first throw aborts —
     * so existing call sites (subscribe) are unchanged; opt in where a long poll must
     * survive transient 429/5xx blips (e.g. a magic-link sign-in wait).
     */
    maxConsecutiveErrors?: number;
    /** Errors tolerance must NOT apply to (dead session, suspended account) — rethrown immediately. */
    isFatal?: (err: unknown) => boolean;
    /** Called on each tolerated error, e.g. to log a retry line. */
    onTransientError?: (err: unknown, consecutive: number) => void;
}
export declare function poll<T>(fn: () => Promise<T | null>, opts?: PollOptions): Promise<T>;
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