title: How can I use "window.stream" in babylonjs?
body: <p>Hi I'm in 'Audio' chapter in babylonjs tutorial.
  I wanna load sound from my microphone and to do that, window.stream is required according the document, but it gives me an error: Property 'stream' does not exist on type 'Window &amp; typeof globalThis'.</p>
  <p>I'm working on my local environment, so I'm wondering if it's necessary to do something such as install some tools.</p>
  <p>How can I solve this issue?</p>