register(src, output, pluginOptions = {}, postCssPlugins = []) {
        return this.preprocess(
            'sass',
            src,
            output,
            this.pluginOptions(pluginOptions),
            postCssPlugins
        );
    }
Register the component.

@param {any} src
@param {string} output
@param {Record<string, any>} pluginOptions
@param {import('postcss').AcceptedPlugin[]}  postCssPlugins