fix: Resolve TypeScript errors

Signed-off-by: Hermes Agent <hermes@nosuchhost>

client/node_modules/level-iterator-stream/example.js

@@ -0,0 +1,26 @@
+var iteratorStream = require('./')
+var leveldown = require('leveldown')
+var path = require('path')
+
+var db = leveldown(path.join(__dirname, 'db'))
+db.open(function (err) {
+  if (err) throw err
+
+  var ops = []
+  for (var i = 0; i < 1000; i++) {
+    ops.push({
+      type: 'put',
+      key: String(Math.random()),
+      value: String(Math.random())
+    })
+  }
+
+  db.batch(ops, function (err) {
+    if (err) throw err
+
+    var stream = iteratorStream(db.iterator())
+    stream.on('data', function (kv) {
+      console.log('%s -> %s', kv.key, kv.value)
+    })
+  })
+})