import { PubkeyIndexMap } from "@chainsafe/pubkey-index-map";
import { CompositeViewDU } from "@chainsafe/ssz";
import { ValidatorIndex, ssz } from "@lodestar/types";
type ValidatorSyncCommitteeIndexMap = Map<ValidatorIndex, number[]>;
export type SyncCommitteeCache = {
    /**
     * Update freq: every ~ 27h.
     * Memory cost: 512 Number integers.
     */
    validatorIndices: Uint32Array;
    /**
     * Update freq: every ~ 27h.
     * Memory cost: Map of Number -> Number with 512 entries.
     * Note: it stores the position indices in sync committee for each sync committee validator
     */
    validatorIndexMap: ValidatorSyncCommitteeIndexMap;
};
/** Placeholder object for pre-altair fork */
export declare class SyncCommitteeCacheEmpty implements SyncCommitteeCache {
    get validatorIndices(): Uint32Array;
    get validatorIndexMap(): ValidatorSyncCommitteeIndexMap;
}
export declare function getSyncCommitteeCache(validatorIndices: Uint32Array): SyncCommitteeCache;
export declare function computeSyncCommitteeCache(syncCommittee: CompositeViewDU<typeof ssz.altair.SyncCommittee>, pubkey2index: PubkeyIndexMap): SyncCommitteeCache;
/**
 * Compute all position index in sync committee for all validatorIndexes in `syncCommitteeIndexes`.
 * Helps reduce work necessary to verify a validatorIndex belongs in a sync committee and which.
 * This is similar to compute_subnets_for_sync_committee in https://github.com/ethereum/eth2.0-specs/blob/v1.1.0-alpha.5/specs/altair/validator.md
 */
export declare function computeValidatorSyncCommitteeIndexMap(validatorIndices: ArrayLike<ValidatorIndex>): ValidatorSyncCommitteeIndexMap;
export {};
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