I want to use Homebrew Mojave bottles on macOS 10.15 Catalina. I don’t want to build everything from source. How can I do this?
You can’t, 10.15 hasn’t been officially released yet so there’s been no effort to bottle formula yet. If the option is there homebrew will try and use older bottles but generally installs on unsupported platforms are from source.
I believe you will get mojave bottles on 10.15 unless you have the
HOMEBREW_SKIP_OR_LATER_BOTTLES environment variables set (as of https://github.com/Homebrew/brew/pull/6212 ).