I have a class Todolist that has objects of Projects class inside it.

I have created an object of Todolist and saved it to my localStorage.

static SaveDate(data) {
    localStorage.clear();
    localStorage.setItem("data", JSON.stringify(data))
}

here data is an object of class Todolist.

When I try to get back my data from local storage and save it into a new object of class Todolist.

static getData() {
    const Todo = Object.assign(
        new Todolist(),
        JSON.parse(localStorage.getItem("data"))
    )
    return Todo;
}

I get a new Object of class Todolist and I can use its methods but I am not able to use the method of Project inside Todolist object. They are simple function objects not objects of a class Project.

How can I make them objects of the class Project?