https://dart-lang.github.io/linter/lints/avoid_returning_null_for_void.html
Best practice
Critical
Avoid returning null for void
Codiga provides multiple sets of rules for 12+ languages. Below we provide a link and a description for all the rules supported by our platform. Note that not all the rules are being listed and described below.
Avoid returning null for void
Type mismatch in assignment
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