title: Is @types/core-js still necessary for TS typings in a Node.js project?
body: <p>I have several backend-only Node.js projects which use a simple TypeScript config.</p>
  
  <p>Before March 2018, I had this in package.json:</p>
  
  <pre><code>  "devDependencies": {
      "@types/core-js": "^0.9.46",
      "@types/node": "^9.6.2"
    }
  </code></pre>
  
  <p>since ~March 2018, I have been omitting <code>"@types/core-js"</code> and everything seems to compile fine. Do we need <code>"@types/core-js"</code> anymore?</p>