unnecessary_null_assert_pattern
The null-assert pattern will have no effect because the matched type isn't nullable.
Description
#The analyzer produces this diagnostic when a null-assert pattern is used to match a value that isn't nullable.
Example
#The following code produces this diagnostic because the variable x
isn't nullable:
dart
void f(int x) {
if (x case var a! when a > 0) {}
}
Common fixes
#Remove the null-assert pattern:
dart
void f(int x) {
if (x case var a when a > 0) {}
}
Unless stated otherwise, the documentation on this site reflects Dart 3.7.3. Page last updated on 2025-05-08. View source or report an issue.