fix: use hasCode from multiformats (#635)

No need to duplicate the function now.

packages/interop/package.json

@@ -69,7 +69,6 @@
     "@helia/mfs": "^3.0.8",
     "@helia/routers": "^1.1.1",
     "@helia/strings": "^3.0.6",
-    "@helia/utils": "^0.3.3",
     "@helia/unixfs": "^3.0.7",
     "@ipld/car": "^5.3.0",
     "@ipld/dag-cbor": "^9.2.0",

packages/interop/src/ipns-pubsub.spec.ts

@@ -4,14 +4,15 @@
 import { gossipsub } from '@chainsafe/libp2p-gossipsub'
 import { ipns } from '@helia/ipns'
 import { pubsub } from '@helia/ipns/routing'
-import { hasCode } from '@helia/utils'
 import { generateKeyPair } from '@libp2p/crypto/keys'
 import { peerIdFromCID } from '@libp2p/peer-id'
 import { expect } from 'aegir/chai'
 import last from 'it-last'
 import { base36 } from 'multiformats/bases/base36'
 import { CID } from 'multiformats/cid'
 import * as raw from 'multiformats/codecs/raw'
+import { hasCode } from 'multiformats/hashes/digest'
+import { identity } from 'multiformats/hashes/identity'
 import { sha256 } from 'multiformats/hashes/sha2'
 import { concat as uint8ArrayConcat } from 'uint8arrays/concat'
 import { fromString as uint8ArrayFromString } from 'uint8arrays/from-string'
@@ -129,7 +130,7 @@ keyTypes.filter(keyType => keyType !== 'RSA').forEach(keyType => {
       const peerCid = CID.parse(result.id, base36)
       const peerId = peerIdFromCID(peerCid)
 
-      if (!hasCode(peerCid.multihash, 0)) {
+      if (!hasCode(peerCid.multihash, identity.code)) {
         throw new Error('Incorrect hash type')
       }
 

packages/utils/src/index.ts

@@ -38,7 +38,7 @@ import type { Blockstore } from 'interface-blockstore'
 import type { Datastore } from 'interface-datastore'
 import type { BlockCodec } from 'multiformats'
 import type { CID } from 'multiformats/cid'
-import type { MultihashDigest, MultihashHasher } from 'multiformats/hashes/interface'
+import type { MultihashHasher } from 'multiformats/hashes/interface'
 
 export { AbstractSession, type AbstractCreateSessionOptions } from './abstract-session.js'
 export { BloomFilter } from './bloom-filter.js'
@@ -280,12 +280,3 @@ export class Helia implements HeliaInterface {
     this.log('gc finished')
   }
 }
-
-/**
- * Used to check that the passed multihash has the passed code
- *
- * Remove after https://github.com/multiformats/js-multiformats/pull/308
- */
-export function hasCode <T extends number> (digest: MultihashDigest, code: T): digest is MultihashDigest<T> {
-  return digest.code === code
-}