import { Epoch, Root, Slot, phase0 } from "@lodestar/types";
import { CachedBeaconStateAllForks } from "../types.js";
/**
 * Cache to prevent accessing the state tree to fetch block roots repeteadly.
 * In normal network conditions the same root is read multiple times, specially the target.
 */
export declare class RootCache {
    private readonly state;
    readonly currentJustifiedCheckpoint: phase0.Checkpoint;
    readonly previousJustifiedCheckpoint: phase0.Checkpoint;
    private readonly blockRootEpochCache;
    private readonly blockRootSlotCache;
    constructor(state: CachedBeaconStateAllForks);
    getBlockRoot(epoch: Epoch): Root;
    getBlockRootAtSlot(slot: Slot): Root;
}
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