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abi_specific_integer_mapping_extra

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Classes extending 'AbiSpecificInteger' must have exactly one 'AbiSpecificIntegerMapping' annotation specifying the mapping from ABI to a 'NativeType' integer with a fixed size.

Description

#

The analyzer produces this diagnostic when a class that extends AbiSpecificInteger has more than one AbiSpecificIntegerMapping annotation.

Example

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The following code produces this diagnostic because there are two AbiSpecificIntegerMapping annotations on the class C:

dart
import 'dart:ffi';

@AbiSpecificIntegerMapping({Abi.macosX64 : Int8()})
@AbiSpecificIntegerMapping({Abi.linuxX64 : Uint16()})
final class C extends AbiSpecificInteger {
  const C();
}

Common fixes

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Remove all but one of the annotations, merging the arguments as appropriate:

dart
import 'dart:ffi';

@AbiSpecificIntegerMapping({Abi.macosX64 : Int8(), Abi.linuxX64 : Uint16()})
final class C extends AbiSpecificInteger {
  const C();
}

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.