getConstructableStyle = (ElementClass, forStaticArea = false) => {
    const tag = ElementClass.getMetadata().getTag();
    const key = `${tag}_${forStaticArea ? "static" : "normal"}`;
    if (!constructableStyleMap.has(key)) {
      const styleContent = (0, _getEffectiveStyle.default)(ElementClass, forStaticArea);
      const style = new CSSStyleSheet();
      style.replaceSync(styleContent);
      constructableStyleMap.set(key, [style]);
    }
    return constructableStyleMap.get(key);
  }
Returns (and caches) a constructable style sheet for a web component class
Note: Chrome
@param ElementClass
@returns {*}