@chainsafe/persistent-merkle-tree/lib/zeroHash.js

Merkle tree implemented as a persistent datastructure

// use noble here instead of using hasher variable because this is used inside hasher itself
// we cache zero hashes so performance is not a concern
import { sha256 } from "@noble/hashes/sha256";
// create array of "zero hashes", successively hashed zero chunks
const zeroHashes = [new Uint8Array(32)];
export function zeroHash(depth) {
    if (depth >= zeroHashes.length) {
        for (let i = zeroHashes.length; i <= depth; i++) {
            zeroHashes[i] = sha256
                .create()
                .update(zeroHashes[i - 1])
                .update(zeroHashes[i - 1])
                .digest();
        }
    }
    return zeroHashes[depth];
}
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