doNotStore top-level constant Null safety

Used to annotate a method, getter or top-level getter or function to indicate that the value obtained by invoking it should not be stored in a field or top-level variable. The annotation can also be applied to a class to implicitly annotate all of the valid members of the class, or applied to a library to annotate all of the valid members of the library, including classes. If a value returned by an element marked as doNotStore is returned from a function or getter, that function or getter should be similarly annotated.

Tools, such as the analyzer, can provide feedback if

• the annotation is associated with anything other than a library, class, method or getter, top-level getter or function, or
• an invocation of a member that has this annotation is returned by a method, getter or function that is not similarly annotated as doNotStore, or
• an invocation of a member that has this annotation is assigned to a field or top-level variable.