non_bool_expression
The expression in an assert must be of type 'bool'.
Description
#The analyzer produces this diagnostic when the first expression in an assert has a type other than bool
.
Example
#The following code produces this diagnostic because the type of p
is int
, but a bool
is required:
dart
void f(int p) {
assert(p);
}
Common fixes
#Change the expression so that it has the type bool
:
dart
void f(int p) {
assert(p > 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.