getMixinDeclaration method
Returns the mixin declaration for the given fragment, or null if there
is no such mixin.
Implementation
Future<MixinDeclaration?> getMixinDeclaration(MixinFragment fragment) async {
var result = await sessionHelper.getFragmentDeclaration(fragment);
var node = result?.node;
if (node is MixinDeclaration) {
return node;
}
return null;
}