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A constructor is a special function of the class that is automatically invoked when we create an instance of the class in Typescript. We use it to initialize the properties of the current instance of the class.

A class is a blueprint from which we can create objects that share the same configuration - properties and methods. An interface is a group of related properties and methods that describe an object, but neither provides implementation nor initialisation for them.

A class in TypeScript can also include properties, methods, and constructor logic. Second, what is a constructor? A constructor is a special function that exists inside a class, that is called only once when the object is created. Classes are unique, and therefore so are the constructor function calls.

The "new expression, whose target lacks a construct signature" error occurs when we use the new keyword where it shouldn't be used or use it with a constructor function. To solve the error, convert the constructor function to a class or remove the new keyword.

So an interface with a construct signature defines the signature of a constructor! The constructor of your class that should comply with the signature defined in the interface(think of it as the constructor implements the interface). It is like a factory!

With a constructor on the interface, you can specify that all of your types must have certain methods/properties (normal interface compliance) but also control how the types get constructed by typing the interface like you would with any other method/property. We are relying on abstractions rather than concretions.