How to reduce the size of my react native app? It's over 1Gb

I have developed my app on react native, and i dont want people on the iOS app market downloading an app thats over 1Gb in size. Mine is currently 1.3Gb!

Some of the biggest culprits:

• Node Module folder (600 Mb). How do i know which modules are DEFINITELY not needed (I wouldn't want to break anything in the app).

• ios/build/projectname/Build/Products/Debug-iphonesimulator (145 Mb) folder

• ios/build/projectname/ModuleCache.noindex (86 Mb)folder

• ios/build/projectname/Build/Intermediates.noindex (86 Mb) folder

Can i delete some of these?

Thanks