use_of_native_extension

Dart native extensions are deprecated and aren't available in Dart 2.15.

The analyzer produces this diagnostic when a library is imported using the dart-ext scheme.

The following code produces this diagnostic because the native library x is being imported using a scheme of dart-ext:

import 'dart-ext:x';

Rewrite the code to use dart:ffi as a way of invoking the contents of the native library.