fix: Resolve TypeScript errors

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

client/node_modules/level-packager/abstract/db-values-test.js

@@ -0,0 +1,30 @@
+'use strict'
+
+var location = require('./location')
+
+module.exports = function (test, level, nonPersistent) {
+  test('test db values', function (t) {
+    var c = 0
+    var db = level(location)
+    var setup = nonPersistent ? function (callback) {
+      db.batch([
+        { type: 'put', key: 'test1', value: 'success' },
+        { type: 'put', key: 'test2', value: 'success' },
+        { type: 'put', key: 'test3', value: 'success' }
+      ], callback)
+    } : function (callback) { callback() }
+
+    function read (err, value) {
+      t.notOk(err, 'no error')
+      t.equal(value, 'success')
+      if (++c === 3) { db.close(t.end.bind(t)) }
+    }
+
+    setup(function (err) {
+      t.notOk(err, 'no error')
+      db.get('test1', read)
+      db.get('test2', read)
+      db.get('test3', read)
+    })
+  })
+}