@atlaskit/editor-core/src/schema/marks/subsup.ts

A package contains Atlassian editor core functionality

import { MarkSpec, Mark } from '../../prosemirror';
import { FONT_STYLE } from '../groups';

export interface Attributes {
  type: 'sub' | 'sup';
}

/**
 * @name subsup_mark
 */
export interface Definition {
  type: 'subsup';
  attrs: Attributes;
}

export interface SubSupMark extends Mark {
  attrs: Attributes;
}

export const subsup: MarkSpec = {
  inclusive: true,
  group: FONT_STYLE,
  attrs: { type: { default: 'sub' } },
  parseDOM: [
    { tag: 'sub', attrs: { type: 'sub' } },
    { tag: 'sup', attrs: { type: 'sup' } }
  ],
  toDOM(mark: SubSupMark) { return [mark.attrs.type]; }
};