Markdown previewer 6 fails when deploy, works locally on my machine

My markdown previewer works on my machine using the CDN in a typescript app:

type PreviewProps = {
  toPreview: string

export default function Preview({ toPreview }: PreviewProps) {
    renderer: new window.marked.Renderer(),
    breaks: true,
    sanitize: true,
  let html = window.marked.parse(toPreview)

  return (
      rounded block
      dangerouslySetInnerHTML={{ __html: html }}

This is my default markdown

export const defaultMarkdown: string = `# header
## Link:
[visit google](
### An Image:
![the react way to render a list](
Inline Code:
example of some \`npm i -S react react-dom\` inline code
### Code Block
*Typescript Code Example*
import React from 'react'
import Editor from './Editor'
import Preview from './Preview'
import './App.css'
import { useState } from 'react'
import { defaultMarkdown } from './markdown'

function App() {
  const [markdown, setMarkdown] = useState(defaultMarkdown)

  const handleChange = (event: React.ChangeEvent<HTMLTextAreaElement>) => {
  return (
    <div className="w-full text-center bg-blue py-20 min-h-screen">
      <h1 className="py-5 mb-4 text-4xl font-extrabold tracking-tight leading-none text-white md:text-5xl lg:text-6xl">
        Markdown Previewer
      <Editor handleMarkdown={(e) => handleChange(e)} markdown={markdown} />
      <Preview toPreview={markdown} />

export default App

### List Item:
1. First item
2. Second item
3. Third item
4. Fourth item
### a Blockquote:
> Dorothy followed her through many of the beautiful rooms in her castle.
### bolded text:

Thanks for your help!

I’ve edited your code for readability. When you enter a code block into a forum post, please precede it with a separate line of three backticks and follow it with a separate line of three backticks to make it easier to read.

You can also use the “preformatted text” tool in the editor (</>) to add backticks around text.

See this post to find the backtick on your keyboard.
Note: Backticks (`) are not single quotes (').

Thanks a lot Dan!
So somehow the first time I click on run tests, iit fails, but the second time they all pass. yeah!