я что-то делаю в app.js как только я создаю Header.js и пробую его испортировать в App.js сразу выскакивает ошибка 
                  
                  
                  Failed to load bundle(http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false) with error:(Unable to resolve module Header from /Users/Tema/JS/projects/secondProject/App.js: Module Header does not exist in the Haste module map
                  
                  
                  
                  
                  
                  This might be related to https://github.com/facebook/react-native/issues/4968
                  
                  
                  To resolve try the following:
                  
                  
                    1. Clear watchman watches: watchman watch-del-all.
                  
                  
                    2. Delete the node_modules folder: rm -rf node_modules && npm install.
                  
                  
                    3. Reset Metro Bundler cache: rm -rf /tmp/metro-bundler-cache-* or npm start -- --reset-cache.
                  
                  
                    4. Remove haste cache: rm -rf /tmp/haste-map-react-native-packager-*. (null))
                  
                  
                  
                  
                  
                  __38-[RCTCxxBridge loadSource:onProgress:]_block_invoke.213
                  
                  
                      RCTCxxBridge.mm:414
                  
                  
                  ___ZL36attemptAsynchronousLoadOfBundleAtURLP5NSURLU13block_pointerFvP18RCTLoadingProgressEU13block_pointerFvP7NSErrorP9RCTSourceE_block_invoke.118
                  
                  
                  __80-[RCTMultipartDataTask URLSession:streamTask:didBecomeInputStream:outputStream:]_block_invoke
                  
                  
                  -[RCTMultipartStreamReader emitChunk:headers:callback:done:]
                  
                  
                  -[RCTMultipartStreamReader readAllPartsWithCompletionCallback:progressCallback:]
                  
                  
                  -[RCTMultipartDataTask URLSession:streamTask:didBecomeInputStream:outputStream:]
                  
                  
                  __88-[NSURLSession delegate_streamTask:didBecomeInputStream:outputStream:completionHandler:]_block_invoke
                  
                  
                  NSBLOCKOPERATION_IS_CALLING_OUT_TO_A_BLOCK
                  
                  
                  -[NSBlockOperation main]
                  
                  
                  -[__NSOperationInternal _start:]
                  
                  
                  __NSOQSchedule_f
                  
                  
                  _dispatch_call_block_and_release
                  
                  
                  _dispatch_client_callout
                  
                  
                  _dispatch_continuation_pop
                  
                  
                  _dispatch_async_redirect_invoke
                  
                  
                  _dispatch_root_queue_drain
                  
                  
                  _dispatch_worker_thread2
                  
                  
                  _pthread_wqthread
                  
                  
                  start_wqthread
                  
                  
                
Скорей всего файл лежит совсем не там, откуда вы его пытаетесь импортировать )
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