sdk_version_eq_eq_operator_in_const_context
Using the operator '==' for non-primitive types wasn't supported until version 2.3.2, but this code is required to be able to run on earlier versions.
Description
#The analyzer produces this diagnostic when the operator ==
is used on a non-primitive type inside a constant context is found in code that has an SDK constraint whose lower bound is less than 2.3.2. Using this operator in a constant context wasn't supported in earlier versions, so this code won't be able to run against earlier versions of the SDK.
Example
#Here's an example of a pubspec that defines an SDK constraint with a lower bound of less than 2.3.2:
environment:
sdk: '>=2.1.0 <2.4.0'
In the package that has that pubspec, code like the following produces this diagnostic:
class C {}
const C a = null;
const C b = null;
const bool same = a == b;
Common fixes
#If you don't need to support older versions of the SDK, then you can increase the SDK constraint to allow the operator to be used:
environment:
sdk: '>=2.3.2 <2.4.0'
If you need to support older versions of the SDK, then either rewrite the code to not use the ==
operator, or change the code so that the expression isn't in a constant context:
class C {}
const C a = null;
const C b = null;
bool same = a == b;
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.