title: WebStorm reports "Missing import statement" when trying to use the undefined primitive
body: <p>Starting today, WebStorm yells anytime I try to use the <code>undefined</code> primitive by saying that I am "Missing [an] import statement", and prompts me to import something as undefined. Here's an example:</p>
  
  <p><a href="https://i.stack.imgur.com/zfu18.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/zfu18.png" alt="enter image description here"></a></p>
  
  <p>My project is written in ES6+ and JSX, and the only action I performed today other that write code is run <code>yarn upgrade --latest</code> and fix any migration errors. The <code>redux-devtools-extension</code> was updated, which makes me think this is an indexing issue, but refreshing my indexes didn't change anything. I also can't find any old post with this specific issue. </p>