fix: Resolve TypeScript errors

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

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

@@ -0,0 +1,44 @@
+var inherits = require('inherits')
+var Readable = require('readable-stream').Readable
+var extend = require('xtend')
+
+module.exports = ReadStream
+inherits(ReadStream, Readable)
+
+function ReadStream (iterator, options) {
+  if (!(this instanceof ReadStream)) return new ReadStream(iterator, options)
+  options = options || {}
+  Readable.call(this, extend(options, {
+    objectMode: true
+  }))
+  this._iterator = iterator
+  this._options = options
+  this.on('end', this.destroy.bind(this, null, null))
+}
+
+ReadStream.prototype._read = function () {
+  var self = this
+  var options = this._options
+  if (this.destroyed) return
+
+  this._iterator.next(function (err, key, value) {
+    if (self.destroyed) return
+    if (err) return self.destroy(err)
+
+    if (key === undefined && value === undefined) {
+      self.push(null)
+    } else if (options.keys !== false && options.values === false) {
+      self.push(key)
+    } else if (options.keys === false && options.values !== false) {
+      self.push(value)
+    } else {
+      self.push({ key: key, value: value })
+    }
+  })
+}
+
+ReadStream.prototype._destroy = function (err, callback) {
+  this._iterator.end(function (err2) {
+    callback(err || err2)
+  })
+}