invalid_export_of_internal_element_indirectly

The member '{0}' can't be exported as a part of a package's public API, but is indirectly exported as part of the signature of '{1}'.

The analyzer produces this diagnostic when a public library exports a top-level function with a return type or at least one parameter type that is marked with the internal annotation.

Given a file a.dart in the src directory that contains the following:

import 'package:meta/meta.dart';

@internal
typedef IntFunction = int Function();

int f(IntFunction g) => g();

The following code produces this diagnostic because the function f has a parameter of type IntFunction, and IntFunction is only intended to be used internally:

export 'src/a.dart' show f;

If the function must be public, then make all the types in the function's signature public types.

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