Issues implementing custom nodeHash without etherjs dependency

[kevzzsk]

I am trying to create a merkle tree outside of EVM context so I am using SimpleMerkleTree. While the consumer are free to implement the leafHash function, the nodeHash is proving to be difficult to deal with without depending on @ethersproject/bytes package because of the type BytesLike.

for instance,

    const v1 = sha256(Buffer.from("8d6cd2a958c38796bbf791ef81835a92e0c85539771b37a12cd249886daf2136", "hex"));
    const v2 = sha256(Buffer.from("cde8ec76677273a270af18285503ce3075b59f7921c0906bee59366bc9d4b8b3", "hex"));
    const tree2 = SimpleMerkleTree.of([v1, v2], {
      nodeHash: (left, right) => sha256(Buffer.concat([Buffer.from(left), Buffer.from(right)])).toString("hex"),
    });

There is a typing issue because BytesLike cannot be converted easily to buffer

is there any ways to write custom nodeHash function with sha256 and does not have dependency on the etherjs lib?