title: Node: Automatically refresh browser on file change
body: <p>I want my node app to automatically refresh my browser when a file changes (no external application).</p>
  
  <p>I'd like to avoid using webpack dev server, as it doesn't allow me to use my own koa server, and is just generally a hassle to work with.</p>
  
  <p>How can I automatically refresh my browser on file change?</p>