uriForPackage static method

Future<Uri> uriForPackage({ required String package, required String libPath, required String? envVariable, })

Returns the uri for a package name and a libPath that contains the wasm module.

The wasm module file should be in lib/libPath. The envVariable is used to get the path to the wasm module from the environment variables.

For compiled native (non-web) Flutter you should use Flutter assets or an HTTP endpoint, such as from a Github release.

Implementation

static Future<Uri> uriForPackage({
  required String package,
  required String libPath,
  required String? envVariable,
}) async {
  const isWeb = identical(0, 0.0);
  if (isWeb) {
    return Uri.parse(
      kIsFlutter
          ? 'asset:packages/$package/lib/$libPath'
          : './packages/$package/$libPath',
    );
  } else {
    final envFile = Platform.environment[envVariable];
    final scriptRoot = File.fromUri(Platform.script).parent.parent;
    Uri? packageUri;
    try {
      packageUri = await Isolate.resolvePackageUri(
        Uri.parse('package:$package/$libPath'),
      );
    } catch (_) {}
    final options = [
      if (envFile != null) Uri.parse(envFile),
      // dart run package:script
      scriptRoot.uri.resolve('lib/$libPath'),
      // dart run test
      Directory.current.uri.resolve('lib/$libPath'),
      // another package
      if (packageUri != null) packageUri,
      // some_dir/script.exe
      Platform.script.resolve(libPath),
    ];
    final wasmFile = options.firstWhere(
      (option) => File.fromUri(option).existsSync(),
      orElse: () => globalLoadAsset != null
          ? Uri.parse('asset:packages/$package/lib/$libPath')
          : options.first,
    );
    return wasmFile;
  }
}