title: Getting Error during Angular Production Build
body: <p>When I was preparing project to publish, I get this error. Can someone tell me how can i fix this?</p>
  
  <pre><code>ERROR in ./node_modules/angular2-jwt/angular2-jwt.js                                                   
  Module build failed: Error: Debug Failure. False expression.                                           
      at getJSDocTags (D:\Visual Studio\asp.net\mean_blog\client\node_modules\@angular-devkit\build-optim
  er\node_modules\typescript\lib\typescript.js:13197:22)                                                 
      at getFirstJSDocTag (D:\Visual Studio\asp.net\mean_blog\client\node_modules\@angular-devkit\build-o
  imizer\node_modules\typescript\lib\typescript.js:13205:24)                                             
      at Object.getJSDocTypeTag (D:\Visual Studio\asp.net\mean_blog\client\node_modules\@angular-devkit\b
  ld-optimizer\node_modules\typescript\lib\typescript.js:13154:19)                                       
      at checkParenthesizedExpression (D:\Visual Studio\asp.net\mean_blog\client\node_modules\@angular-de
  it\build-optimizer\node_modules\typescript\lib\typescript.js:45628:56)                                 
      at checkExpressionWorker (D:\Visual Studio\asp.net\mean_blog\client\node_modules\@angular-devkit\bu
  d-optimizer\node_modules\typescript\lib\typescript.js:45676:28)                                        
      at checkExpression (D:\Visual Studio\asp.net\mean_blog\client\node_modules\@angular-devkit\build-op
  mizer\node_modules\typescript\lib\typescript.js:45609:42)                                              
      at checkBinaryLikeExpression (D:\Visual Studio\asp.net\mean_blog\client\node_modules\@angular-devki
  build-optimizer\node_modules\typescript\lib\typescript.js:45155:29)                                    
      at checkBinaryExpression (D:\Visual Studio\asp.net\mean_blog\client\node_modules\@angular-devkit\bu
  d-optimizer\node_modules\typescript\lib\typescript.js:45147:20)                                        
      at checkExpressionWorker (D:\Visual Studio\asp.net\mean_blog\client\node_modules\@angular-devkit\bu
  d-optimizer\node_modules\typescript\lib\typescript.js:45702:28)                                        
      at checkExpression (D:\Visual Studio\asp.net\mean_blog\client\node_modules\@angular-devkit\build-op
  mizer\node_modules\typescript\lib\typescript.js:45609:42)                                              
      at checkExpressionCached (D:\Visual Studio\asp.net\mean_blog\client\node_modules\@angular-devkit\bu
  d-optimizer\node_modules\typescript\lib\typescript.js:45457:38)                                        
      at getTypeOfExpression (D:\Visual Studio\asp.net\mean_blog\client\node_modules\@angular-devkit\buil
  optimizer\node_modules\typescript\lib\typescript.js:45577:28)                                          
      at checkDeclarationInitializer (D:\Visual Studio\asp.net\mean_blog\client\node_modules\@angular-dev
  t\build-optimizer\node_modules\typescript\lib\typescript.js:45469:24)                                  
      at getTypeForVariableLikeDeclaration (D:\Visual Studio\asp.net\mean_blog\client\node_modules\@angul
  -devkit\build-optimizer\node_modules\typescript\lib\typescript.js:30738:28)                            
      at getWidenedTypeForVariableLikeDeclaration (D:\Visual Studio\asp.net\mean_blog\client\node_modules
  angular-devkit\build-optimizer\node_modules\typescript\lib\typescript.js:30961:24)                     
      at getTypeOfVariableOrParameterOrProperty (D:\Visual Studio\asp.net\mean_blog\client\node_modules\@
  gular-devkit\build-optimizer\node_modules\typescript\lib\typescript.js:31062:28)                       
  npm ERR! code ELIFECYCLE                                                                               
  npm ERR! errno 1                                                                                       
  npm ERR! blog@0.0.0 build: `cd client &amp;&amp; ng build --prod &amp;&amp; cd .. &amp;&amp; node ./bin/www`                   
  npm ERR! Exit status 1                                                                                 
  npm ERR!                                                                                               
  npm ERR! Failed at the blog@0.0.0 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!     C:\Users\Yashdeep Raj\AppData\Roaming\npm-cache\_logs\2018-07-06T19_43_30_221Z-debug.log  
  </code></pre>
  
  <p>I have fixed some error, but these are about module and I know nothing about these error.</p>