ffi_native_invalid_multiple_annotations

Native functions and fields must have exactly one @Native annotation.

The analyzer produces this diagnostic when there is more than one Native annotation on a single declaration.

The following code produces this diagnostic because the function f has two Native annotations associated with it:

import 'dart:ffi';

@Native<Int32 Function(Int32)>()
@Native<Int32 Function(Int32)>(isLeaf: true)
external int f(int v);

Remove all but one of the annotations:

import 'dart:ffi';

@Native<Int32 Function(Int32)>(isLeaf: true)
external int f(int v);

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.