If you are having problems with Nuclide itself, check out some of these troubleshooting tips. More are being added as we come across common issues found by users. If you have an issue that is not listed here, please file a GitHub issue, and depending on how widespread the problem may be, we will add it here as well.

Help! I think Nuclide is broken.

It is probably best to return Nuclide to a known state. This can solve a variety of bizarre problems.

Command-Line Issues

If atom or apm don’t work from the command line, try removing the /usr/local/bin/atom and /usr/local/bin/npm symlinks and restarting Atom. Or, select Install Shell Commands from the Atom menu.

Settings Issues

Keyboard Shorts aren’t working

  • Is the keyboard shortcut registered?
    1. Open the Settings tab either by pressing Cmd-, (Ctrl-, on Linux) or by going to Package | Settings View | Open.
    2. Select Keybindings from the list at the left to see what keybindings you have active.
  • Check your system keyboard shortcuts. There may be another application that is intercepting the shortcut before it reaches Atom.

Nuclide Server Issues


If you are having issues installing the Nuclide Server, check out the following tips:

Node Version

Use the command-line to verify your Node version by running:

node --version


If you get EACCESS errors when you run the npm install command, you likely do not have your NPM properly configured for installing global packages without root permissions. To fix this problem, install in a directory your user owns like this:

npm config set prefix '~/.npm_packages'

and add

PATH=$PATH:$HOME/.npm_packages/bin; export PATH

to the end of your .profile. Now you should be able to run:

npm install -g nuclide

without errors.

If you previously ran npm install as root, you may need to correct the permissions on your .npm directory by running:

sudo chown -R userid:userid .npm

where userid is your userid. If you still get errors you may need to clear your NPM cache with:

npm cache clear

Files Not Syncing

Sometimes you’ll have a setup that used to work, but starts to fail. Here some things you can try to make it work again:

  • If you have a version mismatch between your client and remote server Nuclide installations, you’ll want to run npm update -g nuclide on the server and make sure you have the same version on the client as well.
  • Other tools that watch files may cause problems as well. Try stopping that process and stopping the file watcher as well via watchman shutdown-server. Then try to reconnect to the server again from Atom.
  • Use killall node on the server side, then try reconnecting.

Source Control Issues

Source Control features aren’t working

If any Source Control features such as File Tree highlighting are working in Nuclide, there are a few things to check.

  1. Is the directory you opened in Atom part of a source control repository?
  2. If you are working on a remote directory, only Mercurial is supported. Git will not work.
  3. As of Atom 1.14, symlinks to directories essentially don’t work, even if it’s a Mercurial repository. Use a direct link to the directory to access all the source control features.

Why is the output of hg status wrong?

Files not showing up as expected in hg status are generally caused by one of a few things:

  1. The file is ignored.

    You can run hg status -i to list ignored files.

     hg status -i | grep <filename>
  2. Watchman Issues

    Sometimes Watchman, the filesystem monitoring tool, isn’t telling Mercurial that a file has been added, removed, or changed. You can check if it’s a Watchman issue by running a status command without the Watchman extension:

     hg status --config extensions.fsmonitor=\!

    If the file shows up when you do that, it’s a Watchman issue. In that case, run:

     watchman-diag > out.txt

    Sometimes on Macs, the output file might contain:

     There are 139 items on the filesystem not reported by watchman:

    If you see this and if any components of the listed file names either are or were at some point a symlink, then you have fallen afoul of an Apple bug where fsevents won’t report changes associated with a dangling symlink. You might be able to recover with:

     watchman watch-del-all
     hg --config fsmonitor.mode=off rebase -s '(::bookmark() and draft()) - master::' -d master
     watchman watch-project .
  3. Dirstate Corruption

    This happens most often because someone pressed Ctrl-C during a Mercurial command that was writing to the dirstate file (an index of all the files in the working directory). This corruption can be subtle and you might not notice any issues with it for a while, until you notice files not showing up that really should.

    In this case, try running:

     hg debugrebuilddirstate --minimal

    Then, run hg status again.

  4. Unknown Bugs

    Mercurial is under heavy development and there may be bugs we don’t know about yet that cause issues like this. If you’ve verified that the above things don’t work to fix the issue, let us know by filing a GitHub issue.

Environment Issues

Uninstalling Older Versions of Nuclide

Nuclide v0.0.35 and earlier were released as many separate Atom packages. If you have any packages starting with nuclide-, you likely have some part of <=v0.0.35 still installed.

Run the uninstall command below, which contains the full list of Nuclide’s packages when they were last released on 25 November 2015. This is safe to run even if you only have a subset of the packages installed; apm will ignore any packages that are not present.

$ apm uninstall \
hyperclick \
nuclide-arcanist \
nuclide-blame \
nuclide-blame-provider-hg \
nuclide-blame-ui \
nuclide-buck-files \
nuclide-busy-signal \
nuclide-clang-atom \
nuclide-clipboard-path \
nuclide-code-format \
nuclide-code-highlight \
nuclide-debugger-atom \
nuclide-debugger-hhvm \
nuclide-debugger-lldb \
nuclide-diagnostics-store \
nuclide-diagnostics-ui \
nuclide-file-tree \
nuclide-file-watcher \
nuclide-find-references \
nuclide-flow \
nuclide-format-js \
nuclide-fuzzy-filename-provider \
nuclide-hack \
nuclide-hack-symbol-provider \
nuclide-health \
nuclide-hg-repository \
nuclide-home \
nuclide-installer \
nuclide-language-hack \
nuclide-move-pane \
nuclide-objc \
nuclide-ocaml \
nuclide-open-filenames-provider \
nuclide-quick-open \
nuclide-react-native-inspector \
nuclide-recent-files-provider \
nuclide-recent-files-service \
nuclide-remote-projects \
nuclide-test-runner \
nuclide-toolbar \
nuclide-type-hint \

Flow Issues

Features Not Working

If the Flow features are not working in Nuclide:

  • Make sure flow is in your $PATH environment variable.
  • Ensure that you have /* @flow */ at the top of your .js file.
  • Ensure you have an empty .flowconfig file in the root of of your project directory.

flow and $PATH

If you installed flow in a place not in your $PATH environment variable (e.g., unzipped it in your home directory), then you either have to update your $PATH environment variable or explicitly specify it.

  1. Open the Settings tab either by pressing Cmd-, (Ctrl-, on Linux) or by going to Package | Settings View | Open.
  2. Select Packages from the list at the left, and search for nuclide.
  3. Click on the Settings button for the nuclide package.
  4. Scroll down until you find nuclide-flow.
  5. Set the location of your flow installation in the Path to Flow Executable text box.

Module Not Found

If you are running Nuclide from source, you may occasionally run into a Cannot find module error.

As Nuclide is continuously updated, new modules may be added as dependencies. When you rebase to the latest code and run Nuclide, the new module will not have been installed, so it will not be found.

Running npm update will get you the latest modules so that you should be able to open Nuclide successfully again.

Buck Issues

Nuclide says Diagnostics are disabled, but Buck builds my C++ project

Stand-alone header files are not fully supported yet because Buck doesn’t report flags for them.

The majority of features may still work even without complete flags. You can provide more default flags in the Settings, if necessary.

  1. Open the Settings tab either by pressing Cmd-, (Ctrl-, on Linux) or by going to Package | Settings View | Open.
  2. Select Packages from the list at the left, and search for nuclide.
  3. Click on the Settings button for the nuclide package.
  4. Scroll down until you find nuclide-clang.
  5. Add default flags as necessary.