@atlaskit/editor-core/src/schema/nodes/unknown-block.ts

A package contains Atlassian editor core functionality

import { NodeSpec } from '../../prosemirror';

const name = 'unknownBlock';

export default {
  group: 'block',
  content: 'text<_>*',
  toDOM() { return ['div', { 'data-node-type': name }, 0]; },
  parseDOM: [{ tag: `div[data-node-type="${name}"]` }],
} as NodeSpec;