错误:`fsevents`不可用(此观察者只能在达尔文上使用)

Question

我正在本地环境中克隆现有的react本机应用程序,但每次运行'react-native run-ios'时都会出现以下错误:

** 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

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.

当我为克隆的repo运行'react-native run-ios'时,我才会收到此错误.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,再次卸载和安装节点,删除我的node_modules文件等,但我仍然无法解决这个问题.任何帮助将非常感激.谢谢.

Answer 1

对我来说,我卸载了watchman,然后使用brew如下所示重新安装它:

npm r -g watchman 
brew install watchman

Answer 2

npm install -g fsevents

为我工作

Answer 3

我在编写 React Native 应用程序时遇到了以下问题。watchman 似乎是一个错误，所以我们只需要重新安装它：

brew remove watchman

brew install watchman

我希望它有帮助，

Answer 4

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（我认为这就是您的错误消息告诉您的内容）。我也在使用 React 应用程序并遇到了其他类似的错误。

希望这可以帮助！