I don't see any reason to convert to Bash. watch(1) (on my system) executes
its argument with "sh -c" unless the -x option is given in which case it uses
exec(2). Read the man page.
One options is to make whatever function you want to watch into a command (fish
script in a file). Make sure that the fish script is either in your PATH or
its path is explicitly specified.
Another option is to do something like this as an example. Note that "history"
is a function.
watch -x fish -c "ls; history"
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