import { ForkPostElectra } from "@lodestar/params";
import { EpochCache } from "@lodestar/state-transition";
import { Attestation, electra, phase0 } from "@lodestar/types";
import type { BeaconChain } from "../chain.js";
import { FullyVerifiedBlock, ImportBlockOpts } from "./types.js";
/**
 * Imports a fully verified block into the chain state. Produces multiple permanent side-effects.
 *
 * ImportBlock order of operations must guarantee that BeaconNode does not end in an unknown state:
 *
 * 1. Persist block to hot DB (pre-emptively)
 *    - Done before importing block to fork-choice to guarantee that blocks in the fork-choice *always* are persisted
 *      in the DB. Otherwise the beacon node may end up in an unrecoverable state. If a block is persisted in the hot
 *      db but is unknown by the fork-choice, then it will just use some extra disk space. On restart is will be
 *      pruned regardless.
 *    - Note that doing a disk write first introduces a small delay before setting the head. An improvement where disk
 *      write happens latter requires the ability to roll back a fork-choice head change if disk write fails
 *
 * 2. Import block to fork-choice
 * 3. Import attestations to fork-choice
 * 4. Import attester slashings to fork-choice
 * 5. Compute head. If new head, immediately stateCache.setHeadState()
 * 6. Queue notifyForkchoiceUpdate to engine api
 * 7. Add post state to stateCache
 */
export declare function importBlock(this: BeaconChain, fullyVerifiedBlock: FullyVerifiedBlock, opts: ImportBlockOpts): Promise<void>;
export declare function addAttestationPreElectra(this: BeaconChain, _: EpochCache, target: phase0.Checkpoint, attDataRoot: string, attestation: Attestation, indexedAttestation: phase0.IndexedAttestation): void;
export declare function addAttestationPostElectra(this: BeaconChain, epochCtx: EpochCache, target: phase0.Checkpoint, attDataRoot: string, attestation: Attestation<ForkPostElectra>, indexedAttestation: electra.IndexedAttestation): void;
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