import type { Rpc, RpcSubscriptions, SolanaRpcApi, SolanaRpcSubscriptionsApi } from '@solana/kit';
import type { EventEmitter } from './events.js';
export interface SlotTrackerOptions {
    rpc: Rpc<SolanaRpcApi>;
    rpcSubscriptions: RpcSubscriptions<SolanaRpcSubscriptionsApi>;
    emit: EventEmitter;
    signal: AbortSignal;
}
export interface SlotTracker {
    /** Resolves once estimator has MIN_SAMPLES samples OR a polling fallback populated a slot. */
    readonly ready: Promise<void>;
    /** Returns current best-estimate slot. Throws if never populated. */
    estimate(): bigint;
    /** Was the last slot event within STALL_MS? */
    isFresh(): boolean;
}
export declare function createSlotTracker(opts: SlotTrackerOptions): Promise<SlotTracker>;
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