module Opal

def self.reset_paths!

(includes `corelib`, `stdlib`, `opal/lib`, `ast` gem and `parser` gem)
Resets Opal.paths to the default value 
def self.reset_paths!
  @paths = [core_dir, std_dir, gem_dir]
  if RUBY_ENGINE != 'opal'
    use_gem 'ast'
    use_gem 'parser'
  end
  nil
end