Expose multihashing-async along with other deps

Fix ipfs#1973

Author: Gozala

README.md

@@ -670,6 +670,7 @@ Aside from the default export, `ipfs` exports various types and utilities that a
 - [`multiaddr`](https://www.npmjs.com/package/multiaddr)
 - [`multibase`](https://www.npmjs.com/package/multibase)
 - [`multihash`](https://www.npmjs.com/package/multihash)
+- [`multihashing`](https://github.com./multiformats/js-multihashing-async/)
 - [`multicodec`](https://www.npmjs.com/package/multicodec)
 - [`CID`](https://www.npmjs.com/package/cids)
 

src/core/index.js

@@ -11,6 +11,7 @@ const multihash = require('multihashes')
 const PeerBook = require('peer-book')
 const multibase = require('multibase')
 const multicodec = require('multicodec')
+const multihashing = require('multihashing-async')
 const CID = require('cids')
 const debug = require('debug')
 const mergeOptions = require('merge-options')
@@ -178,7 +179,7 @@ module.exports = IPFS
 
 // Note: We need to do this to force browserify to load the Buffer module
 const BufferImpl = Buffer
-Object.assign(module.exports, { crypto, isIPFS, Buffer: BufferImpl, CID, multiaddr, multibase, multihash, multicodec, PeerId, PeerInfo })
+Object.assign(module.exports, { crypto, isIPFS, Buffer: BufferImpl, CID, multiaddr, multibase, multihash, multihashing, multicodec, PeerId, PeerInfo })
 
 module.exports.createNode = (options) => {
   return new IPFS(options)

test/core/exports.spec.js

@@ -7,6 +7,7 @@ const CID = require('cids')
 const multiaddr = require('multiaddr')
 const multibase = require('multibase')
 const multihash = require('multihashes')
+const multihashing = require('multihashing-async')
 const multicodec = require('multicodec')
 const PeerId = require('peer-id')
 const PeerInfo = require('peer-info')
@@ -26,6 +27,7 @@ describe('exports', () => {
     expect(Ipfs.multiaddr).to.equal(multiaddr)
     expect(Ipfs.multibase).to.equal(multibase)
     expect(Ipfs.multihash).to.equal(multihash)
+    expect(Ipfs.multihashing).to.equal(multihashing)
     expect(Ipfs.multicodec).to.equal(multicodec)
     expect(Ipfs.PeerId).to.equal(PeerId)
     expect(Ipfs.PeerInfo).to.equal(PeerInfo)