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LegacyJavaScriptObject is a type of object in Dart that represents a JavaScript object. It is used when transferring an object from Dart to JavaScript in cases where the object is not directly compatible with JavaScript.

LegacyJavaScriptObject acts as a wrapper object that allows Dart code to interact with JavaScript objects through a dynamic interface. It provides a way for Dart code to interact with JavaScript code without the need for complex conversion logic.

LegacyJavaScriptObject is often used in conjunction with dart:js library to bridge the gap between Dart and JavaScript. For example, when accessing a JavaScript API from Dart, the dart:js library can be used to create a LegacyJavaScriptObject from a JavaScript object, which can then be used to manipulate the object in Dart code.