prefer_const_constructors
Use 'const' with the constructor to improve performance.
Description
#The analyzer produces this diagnostic when an invocation of a const constructor isn't either preceded by const
or in a constant context.
Example
#The following code produces this diagnostic because the invocation of the const
constructor is neither prefixed by const
nor in a constant context:
class C {
const C();
}
C c = C();
Common fixes
#If the context can be made a constant context, then do so:
class C {
const C();
}
const C c = C();
If the context can't be made a constant context, then add const
before the constructor invocation:
class C {
const C();
}
C c = const C();
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.