"yarn build" fails to build in Windows 10

[dance2die]

What?

yarn build on Windows 10 fails to build (while yarn dev runs smoothly).

How to reproduce the error

Run the following command

yarn build

Detailed Error Message

PS C:\misc\sources\Github\pr\reactjs.org> yarn build                                                                                                                                      
yarn run v1.12.1                                                                                                                                                                          
$ gatsby build                                                                                                                                                                            
success open and validate gatsby-config — 0.005 s                                                                                                                                         
success load plugins — 0.223 s                                                                                                                                                            
success onPreInit — 0.931 s                                                                                                                                                               
success delete html and css files from previous builds — 0.183 s                                                                                                                          
success initialize cache — 0.009 s                                                                                                                                                        
success copy gatsby files — 0.333 s                                                                                                                                                       
success onPreBootstrap — 0.021 s                                                                                                                                                          
success source and transform nodes — 0.663 s                                                                                                                                              
success building schema — 0.384 s                                                                                                                                                         
success createPages — 0.347 s                                                                                                                                                             
success createPagesStatefully — 0.041 s                                                                                                                                                   
success onPreExtractQueries — 0.015 s                                                                                                                                                     
success update schema — 0.171 s                                                                                                                                                           
success extract queries from components — 0.144 s                                                                                                                                         
success run graphql queries — 0.197 s — 69/69 353.97 queries/second                                                                                                                       
success write out page data — 0.031 s                                                                                                                                                     
success write out redirect data — 0.012 s                                                                                                                                                 
success onPostBootstrap — 0.001 s                                                                                                                                                         

info bootstrap finished - 5.941 s                                                                                                                                                         

success Building production JavaScript and CSS bundles — 5.190 s                                                                                                                          

error Building static HTML for pages failed                                                                                                                                               

See our docs page on debugging HTML builds for help https://goo.gl/yL9lND                                                                                                                 

   5 |          function __webpack_require__(moduleId) {                                                                                                                                  
   6 |                                                                                                                                                                                    
>  7 |                  // Check if module is in cache                                                                                                                                    
     | ^                                                                                                                                                                                  
   8 |                  if(installedModules[moduleId]) {                                                                                                                                  
   9 |                          return installedModules[moduleId].exports;                                                                                                                
  10 |                  }                                                                                                                                                                 

  WebpackError: C:\misc\sources\Github\pr\reactjs.org\public\C:\misc\sources\Github\pr\reactjs.org\examples\16-3-release-blog-post\context-example contains invalid WIN32 path characters.

  - bootstrap:7 Object.mkdirs                                                                                                                                                             
    lib/webpack/bootstrap:7:1                                                                                                                                                             

  - universalModuleDefinition:5 Object.mkdirs                                                                                                                                             
    lib/webpack/universalModuleDefinition:5:1                                                                                                                                             

  - bootstrap:9 pathExists                                                                                                                                                                
    lib/webpack/bootstrap:9:1                                                                                                                                                             

  - bootstrap:12 fn.apply.then.r                                                                                                                                                          
    lib/webpack/bootstrap:12:1                                                                                                                                                            

error Command failed with exit code 1.                                                                                                                                                    
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.                                                                                                      

Error Demo

Following image shows that yarn dev runs without an issue while yarn build fails.

Environment

• Fork: https://github.com/dance2die/reactjs.org
• Yarn version: 1.12.1
• Node version: 10.1.0
• Git version: 2.17.1.windows.2
• OS

[dance2die]

cc @DSchau

A follow up issue to #1374

[DSchau]

I think the error in building should help narrow down the issue. Seems like a post has some special characters?

invalid WIN32 path characters

in this file

But I'm not sure I see anything off hand 🤔

[dance2die]

I've found it quite weird as it's just a plain .js file... 🤔 I will also try to get more error message if I can over the weekend.

[dance2die]

It looks like C:\misc\sources\Github\pr\reactjs.org\public\C:\misc\sources\Github\pr\reactjs.org\examples\16-3-release-blog-post\context-example is a path resolution issue as

C:\misc\sources\Github\pr\reactjs.org\public + C:\misc\sources\Github\pr\reactjs.org\examples\16-3-release-blog-post\context-example

Not sure yet what's responsible for generating such a path.

[uc-deepak]

what is the resolution? I am facing same issue. Please direct me to right ticket for resolution.

[dance2die]

what is the resolution? I am facing same issue. Please direct me to right ticket for resolution.

I am sorry, @uc-deepak. I can't reproduce because I moved to linux...

Left it open in case others have an solution.