def METHOD_NAME(self):
    PickleHTMLBuilder.METHOD_NAME(self)
    # templates are needed for this builder, but the serializing
    # builder does not initialize them
    self.init_templates()
    if not isinstance(self.templates, BuiltinTemplateLoader):
        raise RuntimeError('websupport builder must be used with '
                           'the builtin templates')
    # add our custom JS
    self.script_files.append('_static/websupport.js')