Error: `fsevents` unavailable (this watcher can only be used on Darwin)

Question

I'm cloning an existing react native app in my local environment, but every time I run react-native run-ios I get the following error:

** 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:

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-ios for 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.

score 55 · Answer 1 · answered Nov 28 '18 at 13:33

55

For me I uninstalled watchman and then reinstalled it using brew as shown below:

npm r -g watchman 
brew install watchman

answered Nov 28 '18 at 13:33

Felix Too

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Using MacOS Catalina and ElectronJS, and this was the only solution that worked for me – bozdoz Feb 05 '20 at 16:23
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I can confirm that this works for me too in the macOS Monterey. The brew command installed a lot of things and took about 5 minutes to complete. – Arefe May 16 '22 at 03:13

score 24 · Answer 2 · answered Jan 23 '19 at 01:01

24

npm install -g fsevents

Worked for me

answered Jan 23 '19 at 01:01

Sid Jonnala

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`npm install fsevents` worked for me. I had to install it locally ("without `-g`") because I'm running `jest-cli` locally. – Patrick McElhaney Jan 28 '19 at 14:11
For me, updating `fsevents` to the latest fixed the issue. I had the same error as OP with version `1.2.4`, but after upgrading to `1.2.7` the issue went away. – dmbaughman Feb 19 '19 at 17:42
i was using yarn and `yarn add fsevents ` worked for me – Gigarthan Dec 17 '19 at 05:23

score 7 · Answer 3 · edited Mar 25 '21 at 06:26

7

I faced the following issue while coding a react native app. It seemed to be an error with watchman, so all we need is to re-install it:

brew remove watchman

brew install watchman

I hope it helps,

edited Mar 25 '21 at 06:26

Whit Waldo

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answered Apr 12 '20 at 20:19

mahmoud mehdi

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`brew install watchman` gave me an error until i did `brew update`. That in itself took about 30 minutes. But then it all worked perfectly thank u! – chichilatte Jan 20 '21 at 13:01
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This is what I needed! Thanks! – Generaldeep Jan 22 '21 at 05:52

score 4 · Answer 4 · answered Oct 11 '18 at 10:27

4

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.

Hope this helps!

answered Oct 11 '18 at 10:27

Jonathan Bareket

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don't know why in the world this worked but yes, I was getting fsevents problems with multiple versions of yarn add. When I switched to npm it worked. WTH but thanks for the suggestion. – ether_joe Nov 16 '19 at 19:34

score 4 · Answer 5 · answered Jan 13 '20 at 23:31

4

This happened in a create-react-app for me. I resolved this by updating react-scripts

yarn add react-scripts@latest

Then deleting node_modules, and re-installing

yarn

answered Jan 13 '20 at 23:31

tic

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This worked for me, didn't have to delete nm and reinstall though. `npm i react-scripts@latest` – Stephanieraymos Sep 02 '21 at 20:42

score 1 · Answer 6 · answered Jun 10 '19 at 16:08

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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.

answered Jun 10 '19 at 16:08

Manoj Amalraj

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score 1 · Answer 7 · edited Jan 16 '23 at 15:43

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Uninstalling watchman and then reinstalling with brew worked:

npm r -g watchman

then

brew install watchman

edited Jan 16 '23 at 15:43

Mo.

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answered Apr 23 '21 at 15:35

Michael

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score 0 · Answer 8 · answered Apr 03 '19 at 15:42

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In my case, following a MacOS update, I needed the updated version of yarn.

curl --compressed -o- -L https://yarnpkg.com/install.sh | bash

answered Apr 03 '19 at 15:42

Carl Manaster

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Error: `fsevents` unavailable (this watcher can only be used on Darwin)

8 Answers8