When running yarn check, I see:
info fsevents@1.2.4: The platform "linux" is incompatible with this module.
info "fsevents@1.2.4" is an optional dependency and failed compatibility check. Excluding it from installation.
This GitHub comment says that the message can be safely ignored.
Is there a way to prevent it from occurring in the first place?
Currently it does not seem possible to prevent messages about optional dependencies which are not explicitly required.
See the following yarn GitHub issues:
Not sure about yarn check but for installing/updating: yarn --silent or even better yarn --silent --ignore-optional
yarn --silent installs optional deps, but without the output.
Note: If running with --ignore-optional flag you may be dependent on some of the optional dependencies without realising it. So I recommend deleting your node_modules folder and yarn.lock file and then running yarn --ignore-optional before testing your project. If it turns out there were optional deps you required, then add them as [dev] deps [accordingly].
Although if it was just fsevents and that was never being installed, no worries.