getHiddenDependencies(targetNode) {
    return arrayFrom(targetNode.getElementsByClassName(ATTRIBUTES.HIDDEN_DEPENDENCY))
      .reduce((acc, node) => {
        node.parentNode.removeChild(node);
        return [...acc, replaceWhiteSpaces(node.textContent)];
      }, [])
  }
Get all nodes values by {ATTRIBUTES.HIDDEN_DEPENDENCY} selector.
Node should be `textarea`.
@param targetNode - {NodeElement}
@returns {Array} - list of node's text content