draft-convert-greger/esm/util/getBlockTags.js

Extensibly serialize & deserialize Draft.js ContentState

import invariant from 'invariant';
import React from 'react';
import ReactDOMServer from 'react-dom/server';
import splitReactElement from './splitReactElement';

function hasChildren(element) {
  return React.isValidElement(element) && React.Children.count(element.props.children) > 0;
}

export default function getBlockTags(blockHTML, noChild) {
  invariant(blockHTML !== null && blockHTML !== undefined, 'Expected block HTML value to be non-null');

  if (typeof blockHTML === 'string') {
    return blockHTML;
  }

  if (React.isValidElement(blockHTML)) {
    if (hasChildren(blockHTML) || noChild) {
      return ReactDOMServer.renderToStaticMarkup(blockHTML);
    }

    return splitReactElement(blockHTML);
  }

  if (Object.prototype.hasOwnProperty.call(blockHTML, 'element') && React.isValidElement(blockHTML.element)) {
    return Object.assign({}, blockHTML, splitReactElement(blockHTML.element));
  }

  invariant(Object.prototype.hasOwnProperty.call(blockHTML, 'start') && Object.prototype.hasOwnProperty.call(blockHTML, 'end'), 'convertToHTML: received block information without either a ReactElement or an object with start/end tags');
  return blockHTML;
}