Method _stripScopingSelectors

packages/compiler/src/shadow_css.ts:634–641

* Handle a css text that is within a rule that should not contain scope selectors by simply * removing them! An example of such a rule is `@font-face`. * * `@font-face` rules cannot contain nested selectors. Nor can they be nested under a selector. * Normally this would be a syntax error

(cssText: string)

   * ```
   */
  private _stripScopingSelectors(cssText: string): string {
    return processRules(cssText, (rule) => {
      const selector = rule.selector
        .replace(_shadowDeepSelectors, ' ')
        .replace(_polyfillHostNoCombinatorRe, ' ');
      return new CssRule(selector, rule.content);
    });
  }

  private _safeSelector: SafeSelector | undefined;
  private _shouldScopeIndicator: boolean | undefined;