@lodestar/beacon-node/lib/chain/blocks/utils/checkpoint.js

A Typescript implementation of the beacon chain

import { SLOTS_PER_EPOCH } from "@lodestar/params";
import { computeEpochAtSlot } from "@lodestar/state-transition";
import { ssz } from "@lodestar/types";
import { ZERO_HASH } from "../../../constants/index.js";
/**
 * Compute a Checkpoint type from `state.latestBlockHeader`
 */
export function getCheckpointFromState(checkpointState) {
    const slot = checkpointState.slot;
    if (slot % SLOTS_PER_EPOCH !== 0) {
        throw Error("Checkpoint state slot must be first in an epoch");
    }
    const blockHeader = ssz.phase0.BeaconBlockHeader.clone(checkpointState.latestBlockHeader);
    if (ssz.Root.equals(blockHeader.stateRoot, ZERO_HASH)) {
        blockHeader.stateRoot = checkpointState.hashTreeRoot();
    }
    return {
        root: ssz.phase0.BeaconBlockHeader.hashTreeRoot(blockHeader),
        epoch: computeEpochAtSlot(slot),
    };
}
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