Add rn-nodeify to your devDependencies in package.json:
"devDependencies": {
"rn-nodeify": "^6.0.1"
}
Add the following to the scripts section of the same file:
"scripts": {
…
"postinstall": "node_modules/.bin/rn-nodeify --install crypto --hack"
}
npm i --save react-native-crypto
# install peer deps
npm i --save react-native-randombytes
react-native link react-native-randombytes
# install latest rn-nodeify
npm i --save-dev mvayngrib/rn-nodeify
# install node core shims and recursively hack package.json files
# in ./node_modules to add/update the "browser"/"react-native" field with relevant mappings
./node_modules/.bin/rn-nodeify --hack --install