When we compile a TypeScript program, all classes and objects become JavaScript objects. Occasionally, however, we may encounter an unexpected behavior at runtime even if the compilation was completed without errors. To be able to identify and understand the cause of this behavior, we need a good understanding of the JavaScript runtime. One of the main concepts that we need to understand is how classes and inheritance work at runtime.
The runtime inheritance system uses a prototypal inheritance model. In a prototypal inheritance model, objects inherit from objects, and there are no classes available. However, we can use prototypes to simulate classes. Let's see how this works.
At runtime, objects have an internal property called prototype. The values of the prototype property is an object that contains some properties (data) and methods (behavior).
In TypeScript...