title: What does npm mean by 'Skipping failed optional dependency'?
body: <p>Latest version of node and npm causing problems in running karma. When I try to install karma-cli <code>npm i -g karma karma-cli</code> I get following warning:</p>
  
  <pre><code>npm WARN optional Skipping failed optional dependency /chokidar/fsevents:
  npm WARN notsup Not compatible with your operating system or architecture: fsevents@1.0.8
  npm WARN optional Skipping failed optional dependency /gulp-karma/chokidar/fsevents:
  npm WARN notsup Not compatible with your operating system or architecture: fsevents@0.2.1
  </code></pre>
  
  <p>And when I try to run <code>karma test</code>, I get following error:</p>
  
  <pre><code>"C:\Program Files\nodejs\node.exe" "C:\Program Files (x86)\JetBrains\WebStorm 11.0.3\plugins\js-karma\js_reporter\karma-intellij\lib\intellijServer.js" --karmaPackageDir=C:\Users\xxx\AppData\Roaming\npm\node_modules\karma --configFile=C:\Users\xxx\Documents\project\karma.conf.js
  26 02 2016 11:24:07.871:WARN [plugin]: Cannot find plugin "karma-chrome-launcher".
    Did you forget to install it ?
    npm install karma-chrome-launcher --save-dev
  26 02 2016 11:24:07.877:WARN [plugin]: Cannot find plugin "karma-firefox-launcher".
    Did you forget to install it ?
    npm install karma-firefox-launcher --save-dev
  26 02 2016 11:24:07.878:WARN [plugin]: Cannot find plugin "karma-phantomjs-launcher".
    Did you forget to install it ?
    npm install karma-phantomjs-launcher --save-dev
  26 02 2016 11:24:07.879:WARN [plugin]: Cannot find plugin "karma-jasmine".
    Did you forget to install it ?
    npm install karma-jasmine --save-dev
  26 02 2016 11:24:07.880:WARN [plugin]: Cannot find plugin "karma-junit-reporter".
    Did you forget to install it ?
    npm install karma-junit-reporter --save-dev
  26 02 2016 11:24:07.885:WARN [plugin]: Cannot find plugin "karma-teamcity-reporter".
    Did you forget to install it ?
    npm install karma-teamcity-reporter --save-dev
  26 02 2016 11:24:07.887:WARN [plugin]: Cannot find plugin "karma-coverage".
    Did you forget to install it ?
    npm install karma-coverage --save-dev
  26 02 2016 11:24:07.888:WARN [plugin]: Cannot find plugin "karma-jasmine-html-reporter".
    Did you forget to install it ?
    npm install karma-jasmine-html-reporter --save-dev
  26 02 2016 11:24:07.889:WARN [plugin]: Cannot find plugin "karma-ng-html2js-preprocessor".
    Did you forget to install it ?
    npm install karma-ng-html2js-preprocessor --save-dev
  26 02 2016 11:24:07.890:WARN [plugin]: Cannot find plugin "karma-browserify".
    Did you forget to install it ?
    npm install karma-browserify --save-dev
  26 02 2016 11:24:07.893:WARN [preprocess]: Can not load "coverage", it is not registered!
    Perhaps you are missing some plugin?
  26 02 2016 11:24:07.893:WARN [preprocess]: Can not load "ng-html2js", it is not registered!
    Perhaps you are missing some plugin?
  26 02 2016 11:24:07.893:WARN [preprocess]: Can not load "browserify", it is not registered!
    Perhaps you are missing some plugin?
  26 02 2016 11:24:07.901:WARN [reporter]: Can not load "coverage", it is not registered!
    Perhaps you are missing some plugin?
  26 02 2016 11:24:07.901:WARN [reporter]: Can not load "junit", it is not registered!
    Perhaps you are missing some plugin?
  C:\Users\xxx\AppData\Roaming\npm\node_modules\karma\node_modules\di\lib\injector.js:9
        throw error('No provider for "' + name + '"!');
        ^
  
  Error: No provider for "framework:jasmine"! (Resolving: framework:jasmine)
      at error (C:\Users\xxx\AppData\Roaming\npm\node_modules\karma\node_modules\di\lib\injector.js:22:12)
      at Object.parent.get (C:\Users\xxx\AppData\Roaming\npm\node_modules\karma\node_modules\di\lib\injector.js:9:13)
      at get (C:\Users\xxx\AppData\Roaming\npm\node_modules\karma\node_modules\di\lib\injector.js:54:19)
      at C:\Users\xxx\AppData\Roaming\npm\node_modules\karma\lib\server.js:138:20
      at Array.forEach (native)
      at Server._start (C:\Users\xxx\AppData\Roaming\npm\node_modules\karma\lib\server.js:137:21)
      at invoke (C:\Users\xxx\AppData\Roaming\npm\node_modules\karma\node_modules\di\lib\injector.js:75:15)
      at Server.start (C:\Users\xxx\AppData\Roaming\npm\node_modules\karma\lib\server.js:102:18)
      at Object.&lt;anonymous&gt; (C:\Program Files (x86)\JetBrains\WebStorm 11.0.3\plugins\js-karma\js_reporter\karma-intellij\lib\intellijServer.js:12:13)
      at Module._compile (module.js:410:26)
      at Object.Module._extensions..js (module.js:417:10)
      at Module.load (module.js:344:32)
      at Function.Module._load (module.js:301:12)
      at Function.Module.runMain (module.js:442:10)
      at startup (node.js:136:18)
      at node.js:966:3
  
  Process finished with exit code 1
  </code></pre>
  
  <p>My configuration specification as follows:</p>
  
  <p><strong>Node version:</strong> <code>v4.3.0</code><br>
  <strong>NPM version:</strong> <code>3.7.3</code></p>
  
  <p>I am not able to get karma version installed, I think it's not installed properly in my machine. </p>