ffi_native_must_be_external
Native functions must be declared external.
Description
#The analyzer produces this diagnostic when a function annotated as being @Native
isn't marked as external
.
Example
#The following code produces this diagnostic because the function free
is annotated as being @Native
, but the function isn't marked as external
:
dart
import 'dart:ffi';
@Native<Void Function(Pointer<Void>)>()
void free(Pointer<Void> ptr) {}
Common fixes
#If the function is a native function, then add the modifier external
before the return type:
dart
import 'dart:ffi';
@Native<Void Function(Pointer<Void>)>()
external void free(Pointer<Void> ptr);
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.