import { LightClientUpdate, Slot } from "@lodestar/types";
/**
 * Wrapper type for `isBetterUpdate()` so we can apply its logic without requiring the full LightClientUpdate type.
 */
export type LightClientUpdateSummary = {
    activeParticipants: number;
    attestedHeaderSlot: Slot;
    signatureSlot: Slot;
    finalizedHeaderSlot: Slot;
    /** `if update.next_sync_committee_branch != [Bytes32() for _ in range(floorlog2(NEXT_SYNC_COMMITTEE_INDEX))]` */
    isSyncCommitteeUpdate: boolean;
    /** `if update.finality_branch != [Bytes32() for _ in range(floorlog2(FINALIZED_ROOT_INDEX))]` */
    isFinalityUpdate: boolean;
};
/**
 * Returns the update with more bits. On ties, prevUpdate is the better
 *
 * https://github.com/ethereum/consensus-specs/blob/be3c774069e16e89145660be511c1b183056017e/specs/altair/light-client/sync-protocol.md#is_better_update
 */
export declare function isBetterUpdate(newUpdate: LightClientUpdateSummary, oldUpdate: LightClientUpdateSummary): boolean;
export declare function isSafeLightClientUpdate(update: LightClientUpdateSummary): boolean;
export declare function toLightClientUpdateSummary(update: LightClientUpdate): LightClientUpdateSummary;
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