If the nodmon is in your root do this steps:

Delete your node mon in your ROOT node module like in this picture !!! that works for me 👍

MacBook-Pro:/usr/local/lib$ cd node_modules/

MacBook-Pro:/usr/local/lib/node_modules$ ls

expo-cli/ npm/ react-native-cli/

nodemon/ react-devtools/

MacBook-Pro:/usr/local/lib/node_modules$ sudo rm -R n

nodemon/ npm/

MacBook-Pro:/usr/local/lib/node_modules$ sudo rm -R nodemon/

MacBook-Pro:/usr/local/lib/node_modules$

then install nodmon again !!

also you can try:

Try

rm -rf node_modules

npm install -g npm@latest

npm i core-util-is