https://www.npmjs.com/package/@node-projects/web-component-designer-stylesheetservice-css-tools
npm i @node-projects/web-component-designer-stylesheetservice-css-tools
This is a Stylesheetparser using @adobe/css-tools
import { CssToolsStylesheetService } from '@node-projects/web-component-designer-stylesheetservice-css-tools';
serviceContainer.register("stylesheetService", designerCanvas => new CssToolsStylesheetService(designerCanvas));