prefer_void_to_null

Details about the 'prefer_void_to_null' diagnostic produced by the Dart analyzer.

Unnecessary use of the type 'Null'.

The analyzer produces this diagnostic when Null is used in a location where void would be a valid choice.

The following code produces this diagnostic because the function f is declared to return null (at some future time):

dart

Future<Null> f() async {}

Replace the use of Null with a use of void:

dart

Future<void> f() async {}

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