What happens with auto updating casks

[punowo]

Say I install a cask with homebrew, alt-tab for example. It has an option to Auto-install updates periodically. What happens when alt-tab updates itself ? Will homebrew recognise the version change ? Will the auto-update even work ? Will homebrew overwrite the cask once the version changes inside the tap without checking the local version ?

[SMillerDev]

If the auto_updates information inside the cask is correct brew upgrade will not attempt to update that cask unless you pass --greedy, in which case it will override the version.

[punowo]

Maybe my problem is that I'm new to mac os in general and I don't understand the installation process; Will the application auto-updating itself interfere in anyway shape or form with homebrew because it was installed with homebrew ? I'm familiar with Linux package managers + scoop / chocolatey on Windows and in these cases most of the time auto-updating would not work / break something.

[SMillerDev]

It can interfere if Homebrew doesn't know this software auto updates. Generally, it does not though.