ambiguous_import

The name '{0}' is defined in the libraries {1}.

The analyzer produces this diagnostic when a name is referenced that is declared in two or more imported libraries.

Given a library (a.dart) that defines a class (C in this example):

class A {}
class C {}

And a library (b.dart) that defines a different class with the same name:

class B {}
class C {}

The following code produces this diagnostic:

import 'a.dart';
import 'b.dart';

void f(C c1, C c2) {}

If any of the libraries aren't needed, then remove the import directives for them:

import 'a.dart';

void f(C c1, C c2) {}

If the name is still defined by more than one library, then add a hide clause to the import directives for all except one library:

import 'a.dart' hide C;
import 'b.dart';

void f(C c1, C c2) {}

If you must be able to reference more than one of these types, then add a prefix to each of the import directives, and qualify the references with the appropriate prefix:

import 'a.dart' as a;
import 'b.dart' as b;

void f(a.C c1, b.C c2) {}

Unless stated otherwise, the documentation on this site reflects Dart 3.8.1. Page last updated on 2025-05-08. View source or report an issue.