@atlaskit/editor-core/src/schema/nodes/heading.ts

A package contains Atlassian editor core functionality

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

/**
 * @name heading_node
 */
export interface Definition {
  type: 'heading';
  content: Array<InlineLinkText>;
  attrs: {
    /**
     * @minimum 1
     * @maximum 6
     */
    level: number;
  };
}

export const heading: NodeSpec = {
  attrs: { level: { default: 1 } },
  content: 'inline<_>*',
  group: 'block',
  defining: true,
  parseDOM: [
    { tag: 'h1', attrs: { level: 1 } },
    { tag: 'h2', attrs: { level: 2 } },
    { tag: 'h3', attrs: { level: 3 } },
    { tag: 'h4', attrs: { level: 4 } },
    { tag: 'h5', attrs: { level: 5 } },
    { tag: 'h6', attrs: { level: 6 } }
  ],
  toDOM(node) { return ['h' + node.attrs['level'], 0]; }
};