feat: use class-is module for type checks

package.json

@@ -56,6 +56,7 @@
     "bs58": "^4.0.1",
     "buffer-loader": "0.0.1",
     "cids": "~0.5.2",
+    "class-is": "^0.4.0",
     "ipfs-block": "~0.6.1",
     "is-ipfs": "~0.3.2",
     "multihashes": "~0.4.12",

src/dag-link/index.js

@@ -2,6 +2,7 @@
 
 const mh = require('multihashes')
 const assert = require('assert')
+const withIs = require('class-is')
 
 // Link represents an IPFS Merkle DAG Link between Nodes.
 class DAGLink {
@@ -59,6 +60,6 @@ class DAGLink {
   }
 }
 
-exports = module.exports = DAGLink
+exports = module.exports = withIs(DAGLink, { className: 'DAGLink', symbolName: '@ipld/js-ipld-dag-pb/daglink' })
 exports.create = require('./create')
 exports.util = require('./util')

src/dag-link/util.js

@@ -3,7 +3,7 @@
 const DAGLink = require('./index')
 
 function isDagLink (link) {
-  return link && link.constructor && link.constructor.name === 'DAGLink'
+  return link && link.constructor && DAGLink.isDAGLink(link)
 }
 
 function createDagLinkFromB58EncodedHash (link) {

src/dag-node/addLink.js

@@ -5,16 +5,17 @@ const cloneLinks = dagNodeUtil.cloneLinks
 const cloneData = dagNodeUtil.cloneData
 const toDAGLink = dagNodeUtil.toDAGLink
 const DAGLink = require('./../dag-link')
+const DAGNode = require('./index')
 const create = require('./create')
 
 function addLink (node, link, callback) {
   const links = cloneLinks(node)
   const data = cloneData(node)
 
-  if ((link.constructor && link.constructor.name === 'DAGLink')) {
+  if ((link.constructor && DAGLink.isDAGLink(link))) {
     // It's a DAGLink instance
     // no need to do anything
-  } else if (link.constructor && link.constructor.name === 'DAGNode') {
+  } else if (link.constructor && DAGNode.isDAGNode(link)) {
     // It's a DAGNode instance
     // convert to link
     link = toDAGLink(link)

src/dag-node/index.js

@@ -2,6 +2,7 @@
 
 const mh = require('multihashes')
 const assert = require('assert')
+const withIs = require('class-is')
 
 class DAGNode {
   constructor (data, links, serialized, multihash) {
@@ -77,7 +78,7 @@ class DAGNode {
   }
 }
 
-exports = module.exports = DAGNode
+exports = module.exports = withIs(DAGNode, { className: 'DAGNode', symbolName: '@ipld/js-ipld-dag-pb/dagnode' })
 exports.create = require('./create')
 exports.clone = require('./clone')
 exports.addLink = require('./addLink')

src/util.js

@@ -19,7 +19,7 @@ function serialize (node, callback) {
   let serialized
 
   // If the node is not an instance of a DAGNode, the link.hash might be a Base58 encoded string; decode it
-  if (node.constructor.name !== 'DAGNode' && node.links) {
+  if (!DAGNode.isDAGNode(node) && node.links) {
     node.links = node.links.map((link) => {
       return DAGLink.util.isDagLink(link) ? link : DAGLink.util.createDagLinkFromB58EncodedHash(link)
     })