    let annotations = css.match(/\/\*\s*# sourceMappingURL=.*\s*\*\//gm)

    if (annotations && annotations.length > 0) {
      // Locate the last sourceMappingURL to avoid picking up
      // sourceMappingURLs from comments, strings, etc.
      let lastAnnotation = annotations[annotations.length - 1]
      if (lastAnnotation) {
        this.annotation = this.getAnnotationURL(lastAnnotation)
      }
    }