title: npm install packages succesful, but don't import any component from those packages
body: <p>I'm in the middle of a react-native project. I've installed, linked and used many packages along time. But now installing packages by npm is being succesful, it is added at package.json, but when I import some feature from package to my project files, app crashes showing messages like:</p>
  
  <pre><code>"undefined is not a object (evaluating '_react.PropTypes.array') 
  
   "undefined is not a object (evaluating '_react.PropTypes.bool') 
  
   "undefined is not a object (evaluating '_react.PropTypes.object') 
  </code></pre>
  
  <p>Example, when I install react-native-modal-picker:</p>
  
  <pre><code>&gt; C:\Users\Taylon\reactive-native-projects\gps7plus&gt;npm install
  &gt; react-native-modal
  &gt; -picker --save npm WARN eslint-plugin-react-native@3.2.1 requires a peer of eslint@^3.17.0 || ^
  &gt; 4.0.0 but none is installed. You must install peer dependencies yourself. npm WARN optional SKIPPING OPTIONAL DEPENDENCY:
  &gt; fsevents@1.1.3 (node_modules\fse vents): npm WARN notsup SKIPPING
  &gt; OPTIONAL DEPENDENCY: Unsupported platform for fsevents@
  &gt; 1.1.3: wanted {"os":"darwin","arch":"any"} (current: {"os":"win32","arch":"x64"} )
  &gt; 
  &gt; + react-native-modal-picker@0.0.16 added 1 package in 19.823s
  </code></pre>
  
  <p>Could these WARN messages mess something?</p>
  
  <p>Linking (any messages):</p>
  
  <pre><code>C:\Users\Taylon\reactive-native-projects\gps7plus&gt;react-native link react-native
  -modal-picker
  Scanning folders for symlinks in C:\Users\Taylon\reactive-native-projects\gps7pl
  us\node_modules (31ms)
  
  C:\Users\Taylon\reactive-native-projects\gps7plus&gt;
  </code></pre>
  
  <p>Importing...</p>
  
  <pre><code>import ModalPicker from 'react-native-modal-picker';
  </code></pre>
  
  <p>I've not even instance this yet. And so red screen:</p>
  
  <pre><code>"undefined is not a object (evaluating '_react.PropTypes.array')
  </code></pre>
  
  <p>Is there any method that allow to check npm errors? Or some to verify if packages are really installed?</p>