title: How to import environment exported by eslint plugin?
body: <p>I see that in <a href="https://github.com/Gillespie59/eslint-plugin-angular/blob/master/environments.js" rel="noreferrer">https://github.com/Gillespie59/eslint-plugin-angular/blob/master/environments.js</a> subsection <code>mocks</code> eslint-plugin-angular declares the <code>inject</code> global variable.</p>
  
  <p>How do I import these environment settings from my application? I tried <code>"extends": "angular"</code> but eslint still complains:</p>
  
  <pre><code>7:14  error  'inject' is not defined  no-undef
  </code></pre>
  
  <p>I tried adding:</p>
  
  <pre><code>"env": {
      "angular/mocks": true
  }
  </code></pre>
  
  <p>to the config, but then I got</p>
  
  <pre><code>Environment key "angular/mocks" is unknown
  </code></pre>