title: Cannot find module that is in package.json
body: <p>I currently have a file that only imports React, and Conversation from <a href="https://yarnpkg.com/en/package/react-conversation-form" rel="nofollow noreferrer">react-conversation-form</a>:</p>
  
  <pre><code>import React from 'react';
  import Conversation from 'react-conversation-form';
  </code></pre>
  
  <p>My package.json looks like this:</p>
  
  <pre><code>{
    "dependencies": {
      "@rails/webpacker": "^3.2.2",
      "babel-preset-react": "^6.24.1",
      "prop-types": "^15.6.0",
      "react": "^16.2.0",
      "react-conversation-form": "^2.0.1",
      "react-dom": "^16.2.0"
    },
    "devDependencies": {
      "babel-core": "^6.26.0",
      "webpack-dev-server": "^2.11.2"
    }
  }
  </code></pre>
  
  <p>Despite this, I am getting a <code>Cannot find module "react-conversation-form"</code> error. Is there a way to debug this?</p>