Export type MerkleLeaf

[bh2smith]

export type MerkleLeaf = string & { _tag: "MerkleLeaf" };

This is an issue specifically when using viem when building the hashLock:

import { encodePacked } from "viem";
const hashLock = secretsCount === 1
  ? HashLock.forSingleFill(secrets[0]!)
  : HashLock.forMultipleFills(
      secretHashes.map(
        (secretHash, i) =>
          encodePacked(
            ["uint64", "bytes32"],
            [BigInt(i), secretHash],
          ) as MerkleLeaf,
      ),
    );

Realistically, it would be nice if there were be a buildHackLock utility function that handles this logic.

Sample implementation:

export function buildSecretData(secrets: Hex[], secretsCount: number): SecretData {
  const secretHashes = secrets.map((x) => HashLock.hashSecret(x) as Hex);

  const hashLock =
    secretsCount === 1
      ? HashLock.forSingleFill(secrets[0]!)
      : HashLock.forMultipleFills(
          secretHashes.map(
            (secretHash, i) =>
              encodePacked(
                ["uint64", "bytes32"],
                [BigInt(i), secretHash],
              ) as MerkleLeaf,
          ),
        );
  return {
    secrets,
    secretHashes,
    hashLock,
  };
}