fix: Resolve TypeScript errors

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

client/node_modules/level-codec/test/ltgt.js

@@ -0,0 +1,25 @@
+var test = require('tape')
+var Codec = require('..')
+
+test('encode ltgt', function (t) {
+  var codec = new Codec({ keyEncoding: 'hex' })
+
+  var ltgt = {
+    start: '686579',
+    lte: '686579'
+  }
+  var encoded = codec.encodeLtgt(ltgt)
+  t.equal(encoded.start.toString(), 'hey')
+  t.equal(encoded.lte.toString(), 'hey')
+
+  ltgt = {
+    start: '686579',
+    lte: '686579',
+    keyEncoding: 'json'
+  }
+  encoded = codec.encodeLtgt(ltgt)
+  t.equal(encoded.start, '"686579"')
+  t.equal(encoded.lte, '"686579"')
+
+  t.end()
+})