can't use as node_modules

[okmttdhr]

I got error like below if I use medium-editor-markdown via npm.

Uncaught ReferenceError: toMarkdown is not defined

My code is something like this.

import MediumEditor from 'medium-editor';
import MeMarkdown from 'medium-editor-markdown';

const editor = new MediumEditor(editableEl, {
  extensions: {
    markdown: new MeMarkdown((md) => {
      markDownEl.textContent = md
    })
  }
});