class Tapioca::Dsl::Compilers::ActionMailer

~~~
end
def self.notify_customer(customer_id); end
sig { params(customer_id: T.untyped).returns(::ActionMailer::MessageDelivery) }
class NotifierMailer
# typed: true
# notifier_mailer.rbi
~~~rbi
this compiler will produce the RBI file ‘notifier_mailer.rbi` with the following content:
~~~
end
end
# …
def notify_customer(customer_id)
class NotifierMailer < ActionMailer::Base
~~~rb
For example, with the following `ActionMailer` subclass:<br><br>(api.rubyonrails.org/classes/ActionMailer/Base.html).
`Tapioca::Dsl::Compilers::ActionMailer` generates RBI files for subclasses of

def action_methods_for_constant 

def action_methods_for_constant
  constant.action_methods.to_a
end

def decorate 

def decorate
  root.create_path(constant) do |mailer|
    action_methods_for_constant.each do |mailer_method|
      method_def = constant.instance_method(mailer_method)
      parameters = compile_method_parameters_to_rbi(method_def)
      mailer.create_method(
        mailer_method,
        parameters: parameters,
        return_type: "::ActionMailer::MessageDelivery",
        class_method: true,
      )
    end
  end
end

def gather_constants 

def gather_constants
  descendants_of(::ActionMailer::Base).reject(&:abstract?)
end