yarn audit fix
Yarn doesn't have npm audit fix.
But here's how to do it by using npm – temporarily.
Generate a package-lock.json file without installing node modules
npm i --package-lock-only
Fix the packages and update the package-lock.json file
npm audit fix
Delete the yarn.lock file and convert package-lock.json file into yarn.lock
rm yarn.lock
yarn import
Delete the package-lock.json file
rm package-lock.json