fix: Resolve TypeScript errors

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

client/node_modules/abstract-leveldown/test/close-test.js

@@ -0,0 +1,39 @@
+var db
+
+exports.setUp = function (test, testCommon) {
+  test('setUp common', testCommon.setUp)
+  test('setUp db', function (t) {
+    db = testCommon.factory()
+    db.open(t.end.bind(t))
+  })
+}
+
+exports.close = function (test, testCommon) {
+  test('test close()', function (t) {
+    t.throws(
+      db.close.bind(db),
+      /Error: close\(\) requires a callback argument/,
+      'no-arg close() throws'
+    )
+    t.throws(
+      db.close.bind(db, 'foo'),
+      /Error: close\(\) requires a callback argument/,
+      'non-callback close() throws'
+    )
+
+    db.close(function (err) {
+      t.error(err)
+      t.end()
+    })
+  })
+}
+
+exports.tearDown = function (test, testCommon) {
+  test('tearDown', testCommon.tearDown)
+}
+
+exports.all = function (test, testCommon) {
+  exports.setUp(test, testCommon)
+  exports.close(test, testCommon)
+  exports.tearDown(test, testCommon)
+}