fix: Resolve TypeScript errors

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

client/node_modules/level-js/util/key-range.js

@@ -0,0 +1,23 @@
+/* global IDBKeyRange */
+
+'use strict'
+
+var ltgt = require('ltgt')
+var NONE = {}
+
+module.exports = function createKeyRange (options) {
+  var lower = ltgt.lowerBound(options, NONE)
+  var upper = ltgt.upperBound(options, NONE)
+  var lowerOpen = ltgt.lowerBoundExclusive(options, NONE)
+  var upperOpen = ltgt.upperBoundExclusive(options, NONE)
+
+  if (lower !== NONE && upper !== NONE) {
+    return IDBKeyRange.bound(lower, upper, lowerOpen, upperOpen)
+  } else if (lower !== NONE) {
+    return IDBKeyRange.lowerBound(lower, lowerOpen)
+  } else if (upper !== NONE) {
+    return IDBKeyRange.upperBound(upper, upperOpen)
+  } else {
+    return null
+  }
+}