What is type compatibility in TypeScript inheritance?

What is type compatibility in TypeScript inheritance?

Type compatibility in TypeScript inheritance refers to how types relate to each other in a class hierarchy. It determines whether a derived class can be used in place of a base class.

Can you give me an example of type compatibility in a class hierarchy?

Sure! If you have a base class Animal and a derived class Dog, you can assign an instance of Dog to a variable of type Animal. This is because Dog is a subtype of Animal.

Are there any exceptions to this rule?

Yes, exceptions can occur if the derived class does not adhere to the structure or properties expected by the base class. For instance, if Dog adds a method that Animal does not have, it may lead to compatibility issues.

How does TypeScript handle structural typing in this context?

TypeScript uses structural typing, meaning that type compatibility is based on the members that a type has rather than its explicit declaration. As long as the derived class has the required properties and methods, it is considered compatible.