@atlaskit/editor-plugin-synced-block/dist/es2019/editor-commands/utils.js

SyncedBlock plugin for @atlaskit/editor-core

export const pasteSyncBlockHTMLContent = (contentDOM, view) => {
  const tmpDiv = document.createElement('div');
  tmpDiv.appendChild(contentDOM);

  // This is required so that prosemirror can read the fragment context and slice properly
  if (tmpDiv.firstChild instanceof HTMLElement) {
    tmpDiv.firstChild.setAttribute('data-pm-slice', '0 0 []');

    // As per requirement - when unsync reference block, it should render its content as copy&paste behaviour
    // Hence here we call pasteHTML to evoke editor paste logic that handles any unsupported nodes/marks
    return view.pasteHTML(tmpDiv.innerHTML);
  }
  return false;
};