How to use the prosemirror-model.DOMSerializer.marksFromSchema function in prosemirror-model

import {DOMSerializer, DOMParser} from 'prosemirror-model';

import ElementSchema from './elementSchema';
import {schema} from './schema';

const markSerializer = DOMSerializer.marksFromSchema(schema);
const nodeSerializer = DOMSerializer.nodesFromSchema(schema);

nodeSerializer.block_embed = function toDOM(node) {
  return ElementSchema.serializeNode(node);
};

nodeSerializer.embed = function toDOM(node) {
  return ElementSchema.serializeNode(node);
};

const clipboardSerializer = new DOMSerializer(nodeSerializer, markSerializer);

const defaultRules = DOMParser.schemaRules(schema);

const getNodeAttrs = (dom) => {
  const nodeId = dom.getAttribute('data-nodeId');

const configureClipboard = ({schema}) => {

  const markSerializer = DOMSerializer.marksFromSchema(schema);
  const nodeSerializer = DOMSerializer.nodesFromSchema(schema);

  /*
  nodeSerializer.block_embed = function toDOM(node) {
    return null;
  };

  nodeSerializer.embed = function toDOM(node) {
    return null;
  };
  */

  const clipboardSerializer = new DOMSerializer(nodeSerializer, markSerializer);
  const defaultRules = DOMParser.schemaRules(schema);
  const transformPastedHTML = function(htmlStr) {
    return htmlStr;