fix: also check for async iterators

Add an additional check for async iterators. This check was also
submitted upstream to typical: 75lb/typical#2

src/index.js

@@ -134,7 +134,9 @@ class IPLDResolver {
    * @returns {Iterable.<Promise.<Object>>} - Returns an async iterator with the IPLD Nodes that correspond to the given `cids`.
    */
   get (cids) {
-    if (!typical.isIterable(cids) || typical.isString(cids) ||
+    if (!(typical.isIterable(cids) ||
+          typeof cids[Symbol.asyncIterator] === 'function') ||
+        typical.isString(cids) ||
         Buffer.isBuffer(cids)) {
       throw new Error('`cids` must be an iterable of CIDs')
     }
@@ -163,7 +165,9 @@ class IPLDResolver {
    * @returns {Iterable.<Promise.<CID>>} - Returns an async iterator with the CIDs of the serialized IPLD Nodes.
    */
   put (nodes, format, userOptions) {
-    if (!typical.isIterable(nodes) || typical.isString(nodes) ||
+    if (!(typical.isIterable(nodes) ||
+         typeof nodes[Symbol.asyncIterator] === 'function') ||
+        typical.isString(nodes) ||
         Buffer.isBuffer(nodes)) {
       throw new Error('`nodes` must be an iterable')
     }
@@ -218,7 +222,9 @@ class IPLDResolver {
    * @return {void}
    */
   remove (cids) {
-    if (!typical.isIterable(cids) || typical.isString(cids) ||
+    if (!(typical.isIterable(cids) ||
+          typeof cids[Symbol.asyncIterator] === 'function') ||
+      typical.isString(cids) ||
         Buffer.isBuffer(cids)) {
       throw new Error('`cids` must be an iterable of CIDs')
     }