import { BeaconState, Epoch, Gwei, Slot, SyncPeriod } from "@lodestar/types";
import { CachedBeaconStateElectra, CachedBeaconStateGloas } from "../types.js";
/**
 * Return the epoch number at the given slot.
 */
export declare function computeEpochAtSlot(slot: Slot): Epoch;
/**
 * Return the epoch at the state slot for purposes of checkpoint.
 * Ideally this slot % SLOTS_PER_EPOCH === 0, but just to handle the improbable case of
 * non boundary slot, using ceil so that the state's latestBlockHeader would always
 * lie before this epooch
 */
export declare function computeCheckpointEpochAtStateSlot(slot: Slot): Epoch;
/**
 * Return the starting slot of the given epoch.
 */
export declare function computeStartSlotAtEpoch(epoch: Epoch): Slot;
/**
 * Return the end slot of the given epoch.
 */
export declare function computeEndSlotAtEpoch(epoch: Epoch): Slot;
/**
 * Return the epoch at which an activation or exit triggered in ``epoch`` takes effect.
 */
export declare function computeActivationExitEpoch(epoch: Epoch): Epoch;
export declare function computeExitEpochAndUpdateChurn(state: CachedBeaconStateElectra | CachedBeaconStateGloas, exitBalance: Gwei): number;
export declare function computeConsolidationEpochAndUpdateChurn(state: CachedBeaconStateElectra | CachedBeaconStateGloas, consolidationBalance: Gwei): number;
/**
 * Return the current epoch of the given state.
 */
export declare function getCurrentEpoch(state: Pick<BeaconState, "slot">): Epoch;
/**
 * Return the previous epoch of the given state.
 */
export declare function getPreviousEpoch(state: Pick<BeaconState, "slot">): Epoch;
/**
 * Return the sync committee period at slot
 */
export declare function computeSyncPeriodAtSlot(slot: Slot): SyncPeriod;
/**
 * Return the sync committee period at epoch
 */
export declare function computeSyncPeriodAtEpoch(epoch: Epoch): SyncPeriod;
/**
 * Determine if the given slot is start slot of an epoch
 */
export declare function isStartSlotOfEpoch(slot: Slot): boolean;
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