fix: Resolve TypeScript errors

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

client/node_modules/level-supports/test/index.js

@@ -0,0 +1,30 @@
+'use strict'
+
+var xtend = require('xtend')
+var shape = require('./shape')
+var cloneable = require('./cloneable')
+
+module.exports = function suite (test, testCommon) {
+  test('db has manifest', function (t) {
+    var db = testCommon.factory()
+    var manifest = db.supports
+
+    shape(t, manifest)
+    cloneable(t, manifest)
+
+    var before = xtend(manifest, {
+      additionalMethods: xtend(manifest.additionalMethods)
+    })
+
+    db.open(function (err) {
+      t.ifError(err, 'no open error')
+      t.same(db.supports, before, 'manifest did not change after open')
+
+      db.close(function (err) {
+        t.ifError(err, 'no close error')
+        t.same(db.supports, before, 'manifest did not change after close')
+        t.end()
+      })
+    })
+  })
+}