React Native: Command PhaseScriptExecution failed

If your React Native builds fail in Xcode with the following message:

Command PhaseScriptExecution failed with a nonzero exit code

one possible reason could be that Xcode is using an outdated version of Node (in my case, it was because I use nvm to manage my Node versions, but Xcode used an old version of Node that I had installed via HomeBrew a long time ago).

By default, Xcode will use the Node binary located at /usr/local/bin/node. Check its version by running:

/usr/local/bin/node -v
node -v

If the first command outputs an older version of Node, simply delete it and replace it with a symlink to the newer one:

rm -rf /usr/local/bin/node
ln -s $(which node) /usr/local/bin/node

Hope that helps!