unnecessary_ question_ mark
The '?' is unnecessary because '{0}' is nullable without it.
Description
#
The analyzer produces this diagnostic when either the type
dynamic
or the
type
Null
is followed by a question mark. Both of these types are
inherently nullable so the question mark doesn't change the semantics.
Example
#
The following code produces this diagnostic because the question mark
following
dynamic
isn't necessary:
dynamic? x;
Common fixes
#Remove the unneeded question mark:
dynamic x;
Unless stated otherwise, the documentation on this site reflects Dart 3.9.2. Page last updated on 2025-9-1. View source or report an issue.