How to get the class name of an object at runtime in TypeScript?

Hello! I'm writing a TypeScript application that handles serialization of different entities. I have a class hierarchy, and I need to determine at runtime which specific class an object is an instance of, in order to process it correctly. For example, I have a base class `Shape` and two subclasses: `Circle` and `Rectangle`. I want to write a function that takes an array of shapes and outputs the type of each one. In JavaScript I would use `obj.constructor.name`, but in TypeScript this property may be missing or undefined after minification/bundling. Moreover, TypeScript is strictly typed, and simply accessing `constructor` doesn't always give the expected result. Here's simplified code that doesn't work as I expect: ```typescript class Shape {