interface-ipfs-core/src/utils/is-shard-at-path.js

A test suite and interface you can use to implement a IPFS core interface.

import { UnixFS } from 'ipfs-unixfs'

/**
 * @param {string} path
 * @param {import('ipfs-core-types').IPFS} ipfs
 */
export default async function isShardAtPath (path, ipfs) {
  const stats = await ipfs.files.stat(path)
  const { value: node } = await ipfs.dag.get(stats.cid)
  const entry = UnixFS.unmarshal(node.Data)

  return entry.type === 'hamt-sharded-directory'
}