https://api.dart.dev/beta/3.11.0-93.2.beta/dart-js_interop/JSAnyUtilityExtension/instanceOfString.html
instanceOfString method - JSAnyUtilityExtension extension - dart:js_interop library - Dart API
API docs for the instanceOfString method from the JSAnyUtilityExtension extension, for the Dart programming language.
methodjsanyutilityextensiondartinteroplibrary