@atlaskit/adf-schema/dist/es2019/schema/marks/underline.js

Shared package that contains the ADF-schema (json) and ProseMirror node/mark specs

import { FONT_STYLE } from '../groups';

/**
 * @name underline_mark
 */

export const underline = {
  inclusive: true,
  group: FONT_STYLE,
  parseDOM: [{
    tag: 'u'
  }, {
    style: 'text-decoration',
    getAttrs: value => value === 'underline' && null
  }],
  toDOM() {
    return ['u'];
  }
};