import { ChainForkConfig } from "@lodestar/config";
import { ForkAll, ForkSeq } from "@lodestar/params";
import { Epoch, SSZTypesFor, Slot } from "@lodestar/types";
export declare const VALIDATOR_BYTES_SIZE: number;
export declare function getForkFromStateBytes(config: ChainForkConfig, bytes: Uint8Array): ForkSeq;
export declare function getStateTypeFromBytes(config: ChainForkConfig, bytes: Uint8Array): SSZTypesFor<ForkAll, "BeaconState">;
export declare function getStateSlotFromBytes(bytes: Uint8Array): Slot;
export type StateBytesMetadata = {
    slot: Slot;
    genesisTime: number;
    genesisValidatorsRoot: Uint8Array;
};
export declare function readBeaconStateBytesMetadata(bytes: Uint8Array): StateBytesMetadata | null;
/** Read only the validator fields needed for weak subjectivity, without allocating validator objects. */
export declare function scanActiveValidatorsFromStateBytes(stateBytes: Uint8Array, stateType: SSZTypesFor<ForkAll, "BeaconState">, epoch: Epoch): {
    activeValidatorCount: number;
    totalActiveBalanceIncrements: number;
} | null;
export declare function getValidatorCountFromStateBytes(config: ChainForkConfig, stateBytes: Uint8Array): number | null;
/** Returns a view into `stateBytes`, or null if the index is not in the registry. */
export declare function getValidatorPubkeyFromStateBytes(config: ChainForkConfig, stateBytes: Uint8Array, index: number): Uint8Array | null;
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