"Cannot resolve" error when running 2 parallel assemblies

I have 2 assemblies running in parallel (for build/server/

( target: 'node'

) and build/client/

( target: 'web'

) so there should be no file overlap) and sometimes (which is the weird part - only sometimes) I have the following:

WARNING in (webpack)-dev-server/~/socket.io-client/~/engine.io-client/~/ws/lib/BufferUtil.js
Module not found: Error: Cannot resolve 'file' or 'directory' ../build/Release/bufferutil in test/node_modules/webpack-dev-server/node_modules/socket.io-client/node_modules/engine.io-client/node_modules/ws/lib
 @ (webpack)-dev-server/~/socket.io-client/~/engine.io-client/~/ws/lib/BufferUtil.js 8:19-57

WARNING in (webpack)-dev-server/~/socket.io-client/~/engine.io-client/~/ws/lib/BufferUtil.js
Module not found: Error: Cannot resolve 'file' or 'directory' ../build/default/bufferutil in test/node_modules/webpack-dev-server/node_modules/socket.io-client/node_modules/engine.io-client/node_modules/ws/lib
 @ (webpack)-dev-server/~/socket.io-client/~/engine.io-client/~/ws/lib/BufferUtil.js 10:19-57

WARNING in (webpack)-dev-server/~/socket.io-client/~/engine.io-client/~/ws/lib/Validation.js
Module not found: Error: Cannot resolve 'file' or 'directory' ../build/Release/validation in test/node_modules/webpack-dev-server/node_modules/socket.io-client/node_modules/engine.io-client/node_modules/ws/lib
 @ (webpack)-dev-server/~/socket.io-client/~/engine.io-client/~/ws/lib/Validation.js 8:19-57

WARNING in (webpack)-dev-server/~/socket.io-client/~/engine.io-client/~/ws/lib/Validation.js
Module not found: Error: Cannot resolve 'file' or 'directory' ../build/default/validation in test/node_modules/webpack-dev-server/node_modules/socket.io-client/node_modules/engine.io-client/node_modules/ws/lib
 @ (webpack)-dev-server/~/socket.io-client/~/engine.io-client/~/ws/lib/Validation.js 10:19-57

ERROR in (webpack)-dev-server/~/socket.io-client/~/engine.io-client/~/xmlhttprequest/lib/XMLHttpRequest.js
Module not found: Error: Cannot resolve module 'fs' in test/node_modules/webpack-dev-server/node_modules/socket.io-client/node_modules/engine.io-client/node_modules/xmlhttprequest/lib
 @ (webpack)-dev-server/~/socket.io-client/~/engine.io-client/~/xmlhttprequest/lib/XMLHttpRequest.js 14:9-22

ERROR in (webpack)-dev-server/~/socket.io-client/~/engine.io-client/~/xmlhttprequest/lib/XMLHttpRequest.js
Module not found: Error: Cannot resolve module 'child_process' in test/node_modules/webpack-dev-server/node_modules/socket.io-client/node_modules/engine.io-client/node_modules/xmlhttprequest/lib
 @ (webpack)-dev-server/~/socket.io-client/~/engine.io-client/~/xmlhttprequest/lib/XMLHttpRequest.js 16:12-36

ERROR in (webpack)-dev-server/~/socket.io-client/~/engine.io-client/~/ws/lib/WebSocketServer.js
Module not found: Error: Cannot resolve module 'tls' in test/node_modules/webpack-dev-server/node_modules/socket.io-client/node_modules/engine.io-client/node_modules/ws/lib
 @ (webpack)-dev-server/~/socket.io-client/~/engine.io-client/~/ws/lib/WebSocketServer.js 14:10-24

ERROR in (webpack)-dev-server/~/socket.io-client/~/engine.io-client/~/ws/lib/WebSocket.js
Module not found: Error: Cannot resolve module 'fs' in test/node_modules/webpack-dev-server/node_modules/socket.io-client/node_modules/engine.io-client/node_modules/ws/lib
 @ (webpack)-dev-server/~/socket.io-client/~/engine.io-client/~/ws/lib/WebSocket.js 13:9-22

ERROR in (webpack)-dev-server/~/socket.io-client/~/engine.io-client/~/ws/~/options/lib/options.js
Module not found: Error: Cannot resolve module 'fs' in test/node_modules/webpack-dev-server/node_modules/socket.io-client/node_modules/engine.io-client/node_modules/ws/node_modules/options/lib
 @ (webpack)-dev-server/~/socket.io-client/~/engine.io-client/~/ws/~/options/lib/options.js 6:9-22

      

        
        
        
      

    

works the same sequentially only when the client

build was completed before server

.

I tried to figure it out myself, no luck ... AFAIU there are two versions socket.io

for different network / node purposes and they are messed up somehow.