pkgs/hooks/example/build/local_asset/hook/build.dart

// Copyright (c) 2024, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

import 'dart:io';

import 'package:code_assets/code_assets.dart';
import 'package:hooks/hooks.dart';

const assetName = 'asset.txt';
final packageAssetPath = Uri.file('assets/$assetName');

Future<void> main(List<String> args) async {
  await build(args, (input, output) async {
    if (input.config.code.linkModePreference == .static) {
      // Simulate that this build hook only supports dynamic libraries.
      throw UnsupportedError('LinkModePreference.static is not supported.');
    }

    final packageName = input.packageName;
    final assetPath = input.outputDirectory.resolve(assetName);
    final assetSourcePath = input.packageRoot.resolveUri(packageAssetPath);

    // Insert code that downloads or builds the asset to `assetPath`.
    await File.fromUri(assetSourcePath).copy(assetPath.toFilePath());

    output.dependencies.add(assetSourcePath);

    output.assets.code.add(
      // TODO: Change to DataAsset once the Dart/Flutter SDK can consume it.
      CodeAsset(
        package: packageName,
        name: 'asset.txt',
        file: assetPath,
        linkMode: DynamicLoadingBundled(),
      ),
    );
  });
}