def METHOD_NAME(self, config: MkDocsConfig, **kwargs) -> MkDocsConfig:
    "Add plugin templates and scripts to config."
    if config.theme.get('include_search_page'):
        config.theme.static_templates.add('search.html')
    if not config.theme.get('search_index_only'):
        path = os.path.join(base_path, 'templates')
        config.theme.dirs.append(path)
        if 'search/main.js' not in config.extra_javascript:
            config.extra_javascript.append('search/main.js')  # type: ignore
    if self.config.lang is None:
        # lang setting undefined. Set default based on theme locale
        validate = _PluginConfig.lang.run_validation
        self.config.lang = validate(config.theme.locale.language)
    # The `python` method of `prebuild_index` is pending deprecation as of version 1.2.
    # TODO: Raise a deprecation warning in a future release (1.3?).
    if self.config.prebuild_index == 'python':
        log.info(
            "The 'python' method of the search plugin's 'prebuild_index' config option "
            "is pending deprecation and will not be supported in a future release."
        )
    return config