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missing_size_annotation_carray

Contents

Fields of type 'Array' must have exactly one 'Array' annotation.

Description

#

The analyzer produces this diagnostic when a field in a subclass of either Struct or Union has a type of Array but doesn't have a single Array annotation indicating the dimensions of the array.

For more information about FFI, see C interop using dart:ffi.

Example

#

The following code produces this diagnostic because the field a0 doesn't have an Array annotation:

dart
import 'dart:ffi';

final class C extends Struct {
  external Array<Uint8> a0;
}

Common fixes

#

Ensure that there's exactly one Array annotation on the field:

dart
import 'dart:ffi';

final class C extends Struct {
  @Array(8)
  external Array<Uint8> a0;
}

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.