title: Can not get environment variables "ELECTRON_GET_USE_PROXY" in integrated terminal of vscode. Is anyone else has met this problem?
body: <p>I am using electron-quick-start project to learn electron, and when I open this project in vscode and execute <code>yarn install</code>, some exception has been throwed out:</p>
  <pre><code>Exit code: 1
  Command: node install.js
  Arguments:
  Directory: C:\Users\user_home\Downloads\electron-quick-start-master\node_modules\electron
  Output:
  RequestError: getaddrinfo ENOTFOUND npm.taobao.org
      at ClientRequest.&lt;anonymous&gt; (C:\Users\user_home\Downloads\electron-quick-start-master\node_modules\got\source\request-as-event-emitter.js:178:14)
      at Object.onceWrapper (events.js:418:26)
      at ClientRequest.emit (events.js:323:22)
      at ClientRequest.origin.emit (C:\Users\user_home\Downloads\electron-quick-start-master\node_modules\@szmarczak\http-timer\source\index.js:37:11)
      at TLSSocket.socketErrorListener (_http_client.js:426:9)
      at TLSSocket.emit (events.js:311:20)
      at emitErrorNT (internal/streams/destroy.js:92:8)
      at emitErrorAndCloseNT (internal/streams/destroy.js:60:3)
      at processTicksAndRejections (internal/process/task_queues.js:84:21)
  </code></pre>
  <p>I have set the system environment variables following electron's official proxy setting guide:</p>
  <pre><code>ELECTRON_MIRROR=&quot;https://npm.taobao.org/mirrors/electron/&quot;
  ELECTRON_GET_USE_PROXY=true
  </code></pre>
  <p>by debuging the node_modules/electron/install.js, I found that the process.env.ELECTRON_GET_USE_PROXY is not value I have set but undefined. but when I debug this script in powershell opened from the explorer, process.env.ELECTRON_GET_USE_PROXY print out the right value I have set.</p>