title: How to set environment variable in React JS..?
body: <p>I am new to React JS. I am trying to build war file from React App but stuck somewhere below. It gives me below errors.</p>
  
  <pre><code>Creating an optimized production build...
  
  Treating warnings as errors because process.env.CI = true.
  Most CI servers set it automatically.
  
  Failed to compile.
  
  
  
  ./src/Home.js
    Line 2:   'AppNavbar' is defined but never used  no-unused-vars
    Line 3:  'Link' is defined but never used       no-unused-vars
    Line 4:  'Button' is defined but never used     no-unused-vars
    Line 4:  'Container' is defined but never used  no-unused-vars
  
  ./src/App.js
    Line 5:   'MenuBar' is defined but never used        no-unused-vars
    Line 6:   'PrivilegeList' is defined but never used  no-unused-vars
    Line 8:   'logo' is defined but never used           no-unused-vars
  
  
    npm ERR! code ELIFECYCLE
    npm ERR! errno 1
    npm ERR! my-app@0.1.0 build: `react-scripts build`
    npm ERR! Exit status 1
    npm ERR!
    npm ERR! Failed at the my-app@0.1.0 build script.
    npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
  
    npm ERR! A complete log of this run can be found in:
      npm ERR!     D:\ReactJS-workspace\my-app\npm\cache\_logs\2018-10-19T07_44_19_233Z-debug.log
      [INFO] ------------------------------------------------------------------------
      [INFO] BUILD FAILURE
      [INFO] ------------------------------------------------------------------------
      [INFO] Total time: 01:36 min
      [INFO] Finished at: 2018-10-19T13:14:19+05:30
      [INFO] ------------------------------------------------------------------------
      [ERROR] Failed to execute goal org.codehaus.mojo:exec-maven-plugin:1.3.2:exec (npm run build (compile)) on project my-app: Command execution failed.: Process exited with an error: 1 (Exit value: 1) -&gt; [Help 1]
      [ERROR]
      [ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
      [ERROR] Re-run Maven using the -X switch to enable full debug logging.
      [ERROR]
      [ERROR] For more information about the errors and possible solutions, please read the following articles:
      [ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException
  </code></pre>
  
  <p>Below is my folder structure. </p>
  
  <p><a href="https://i.stack.imgur.com/fixJJ.png" rel="noreferrer"><img src="https://i.stack.imgur.com/fixJJ.png" alt="enter image description here"></a></p>
  
  <p>I want to set <code>process.env.CI = false</code> how to set environment variable in React JS?</p>