diff --git a/lib/pycall-setup.rb b/lib/pycall-setup.rb
index 9668839..37f6aee 100644
--- a/lib/pycall-setup.rb
+++ b/lib/pycall-setup.rb
@@ -1,9 +1,7 @@
+# typed: false
 # frozen_string_literal: true
 
 require "pycall/import"
+include PyCall::Import # rubocop:disable Style/MixinUsage
 
-include(Module.new do
-  extend PyCall::Import
-
-  pyfrom "influxdb_client_3", import: :InfluxDBClient3
-end)
+pyfrom "influxdb_client_3", import: :InfluxDBClient3
diff --git a/lib/pycall-setup.rbi b/lib/pycall-setup.rbi
new file mode 100644
index 0000000..3d46e87
--- /dev/null
+++ b/lib/pycall-setup.rbi
@@ -0,0 +1,15 @@
+# typed: true
+
+module InfluxDBClient3; end
+
+module PyCall
+  def self.init(*args); end
+
+  module Import
+    def self.pyfrom(*args); end
+
+    def self.import(*args); end
+  end
+
+  class PyError; end # rubocop:disable Lint/EmptyClass
+end