You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: javascript.rb
    path of file: ./repos/arachni/lib/arachni/browser
    
    the code of the file until where you have to start completion: =begin
    Copyright 2010-2022 Ecsypno <http://www.ecsypno.com>

    This file 
    
    def wait_till_ready
        print_debug_level_2 'Waiting for custom JS...'

        if !supported?
            print_debug_level_2 '...unsupported.'
            return
        end