javascript 错误：`fsevents` 不可用（这个观察器只能在 Darwin 上使用）
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Error: `fsevents` unavailable (this watcher can only be used on Darwin)
提问by Aly Dabbous
I'm cloning an existing react native app in my local environment, but every time I run react-native run-iosI get the following error:
我正在本地环境中克隆现有的 React Native 应用程序，但每次运行时react-native run-ios都会出现以下错误：
** BUILD FAILED **
The following commands produced analyzer issues:
Analyze /Users/alydabbous/code/Dabbous-Innopay/ideal-app/node_modules/react-native/ReactCommon/yoga/yoga/YGNodeList.c normal x86_64
Analyze /Users/alydabbous/code/Dabbous-Innopay/ideal-app/node_modules/react-native/ReactCommon/yoga/yoga/Yoga.c normal x86_64
Analyze Base/RCTModuleMethod.mm normal x86_64
(3 commands with analyzer issues)
The following build commands failed:
Ld build/Build/Products/Debug-iphonesimulator/MyUros.app/MyUros normal x86_64
(1 failure)
Installing build/Build/Products/Debug-iphonesimulator/TPP.app
An error was encountered processing the command (domain=NSPOSIXErrorDomain, code=2):
Failed to install the requested application
An application bundle was not found at the provided path.
Provide a valid path to the desired application bundle.
Print: Entry, ":CFBundleIdentifier", Does Not Exist
Command failed: /usr/libexec/PlistBuddy -c Print:CFBundleIdentifier build/Build/Products/Debug-iphonesimulator/TPP.app/Info.plist
Print: Entry, ":CFBundleIdentifier", Does Not Exist
And this error in react-packager:
而 react-packager 中的这个错误：
Loading dependency graph...(node:52097) UnhandledPromiseRejectionWarning: Error: `fsevents` unavailable (this watcher can only be used on Darwin)
at new FSEventsWatcher (/Users/alydabbous/code/Dabbous-Innopay/ideal-app/node_modules/sane/src/fsevents_watcher.js:41:11)
at createWatcher (/Users/alydabbous/code/Dabbous-Innopay/ideal-app/node_modules/jest-haste-map/build/index.js:600:23)
at Array.map (<anonymous>)
at HasteMap._watch (/Users/alydabbous/code/Dabbous-Innopay/ideal-app/node_modules/jest-haste-map/build/index.js:747:25)
at _buildPromise._buildFileMap.then.then.hasteMap (/Users/alydabbous/code/Dabbous-Innopay/ideal-app/node_modules/jest-haste-map/build/index.js:279:21)
at <anonymous>
at process._tickCallback (internal/process/next_tick.js:189:7)
(node:52097) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 1)
(node:52097) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.
I only get this error when I run react-native run-iosfor a repo I cloned. But when I create a new react-native app everything works fine. I tried everything: killing the servers, uninstalling and installing node again, deleting my node_modules file, etc and still I can't solve this issue. Any help would be much appreciated. Thanks.
当我运行react-native run-ios我克隆的存储库时，我只会收到此错误。但是当我创建一个新的 react-native 应用程序时，一切正常。我尝试了一切：杀死服务器，再次卸载并安装节点，删除我的 node_modules 文件等，但仍然无法解决此问题。任何帮助将非常感激。谢谢。
回答by Felix Too
For me I uninstalled watchmanand then reinstalled it using brewas shown below:
对我来说，我卸载watchman然后使用brew如下所示重新安装它：
npm r -g watchman
brew install watchman
回答by Sid Jonnala
npm install -g fsevents
Worked for me
对我来说有效
回答by Jonathan Bareket
I got the same error when trying to run jest watch. Simple solution for me was to install the fsevents module through npm (which I assume this is what your error message is telling you). I was also working with a React app and had additional similar errors.
我在尝试运行 jest watch 时遇到了同样的错误。对我来说，简单的解决方案是通过 npm 安装 fsevents 模块（我认为这是您的错误消息告诉您的）。我也在使用 React 应用程序并遇到了其他类似的错误。
Hope this helps!
希望这可以帮助！
回答by mahmoud mehdi
I faced the following issue while coding a react native app. It seemed to be an error with watchamn, so all we need is to re-install it:
我在编写 React Native 应用程序时遇到了以下问题。watchamn 似乎是一个错误，所以我们只需要重新安装它：
brew remove watchman
brew remove watchman
brew install watchman
brew install watchman
I hope it helps,
我希望它有帮助，
回答by Carl Manaster
In my case, following a MacOS update, I needed the updated version of yarn.
就我而言，在 MacOS 更新之后，我需要更新版本的yarn.
curl --compressed -o- -L https://yarnpkg.com/install.sh | bash
回答by Manoj Amalraj
Sometimes this issue could be related to the node version you are running. If you are using nvm, try switching to a different node version and see if it fixes. It worked for me on a similar issue.
有时，此问题可能与您运行的节点版本有关。如果您使用的是 nvm，请尝试切换到不同的节点版本并查看它是否已修复。它在类似的问题上对我有用。
回答by tic
This happened in a create-react-appfor me. I resolved this by updating react-scripts
这发生在create-react-app我身上。我通过更新解决了这个问题react-scripts
yarn add react-scripts@latest
yarn add react-scripts@latest
Then deleting node_modules, and re-installing
然后删除node_modules，重新安装
yarn
yarn
