fix: Resolve TypeScript errors

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

client/node_modules/level-js/util/serialize.js

@@ -0,0 +1,21 @@
+'use strict'
+
+var Buffer = require('buffer').Buffer
+// Returns either a Uint8Array or Buffer (doesn't matter to
+// IndexedDB, because Buffer is a subclass of Uint8Array)
+var str2bin = (function () {
+  if (global.TextEncoder) {
+    var encoder = new TextEncoder('utf-8')
+    return encoder.encode.bind(encoder)
+  } else {
+    return Buffer.from
+  }
+})()
+
+module.exports = function (data, asBuffer) {
+  if (asBuffer) {
+    return Buffer.isBuffer(data) ? data : str2bin(String(data))
+  } else {
+    return String(data)
+  }
+}