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You need a space before the !.

Problematic code:

while! [ -f file ]
do sleep 1; done

Correct code:

while ! [ -f file ]
do sleep 1; done

Rationale:

ShellCheck found a keyword immediately followed by a !. There needs to be a space between them.

Exceptions:

None

ShellCheck is a static analysis tool for shell scripts. This page is part of its documentation.