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

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

export function getRenderedAttributes(nodeOrMark: Node | Mark, extensionAttributes: ExtensionAttribute[]): Record<string, any> {
  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) => mergeAttributes(attributes, attribute), {})
}