tiptap/packages/core/src/helpers/getRenderedAttributes.ts

import { Node, Mark } from 'prosemirror-model'
import { ExtensionAttribute, AnyObject } from '../types'
import mergeAttributes from '../utilities/mergeAttributes'

export default function getRenderedAttributes(nodeOrMark: Node | Mark, extensionAttributes: ExtensionAttribute[]): AnyObject {
  return extensionAttributes
    .filter(item => item.attribute.rendered)
    .map(item => {
      if (!item.attribute.renderHTML) {
        return {
          [item.name]: nodeOrMark.attrs[item.name],
        }
      }

      return item.attribute.renderHTML(nodeOrMark.attrs) || {}
    })
    .reduce((attributes, attribute) => {
      return mergeAttributes(attributes, attribute)
    }, {})
}