Is it possible to use class instances with create?

[fakalit]

Feeding class instances to create function causes the following Error, unless they are wrapped with a primitive like it's done in the class benchmark example.

Error: Invalid base state: create() only supports plain objects, arrays, Set, Map or using mark() to mark the state as immutable

Is this by design? What is the recommended usage pattern for mutating class instances?

[unadlib]

As mentioned in the error message, you can use the mark option function to mark immutable class instances. For example,

class Foobar {
  foo = {
    bar: 'str',
  };

  change() {
    this.foo.bar = 'new str';
  }
}

const data = {
  foo: {
    bar: 'str',
  },
  foobar: new Foobar(),
};

const state = create(
  data,
  (draft) => {
    draft.foo.bar = 'new str';
    draft.foobar.change();
  },
  {
    mark: (target, { immutable }) => {
      if (target instanceof Foobar) return immutable;
    },
  }
);
const foobar = new Foobar();
foobar.foo.bar = 'new str';
expect(state).toEqual({ foo: { bar: 'new str' }, foobar });
expect(state).not.toBe(data);
expect(state.foo).not.toBe(data.foo);
expect(state.foobar).not.toBe(data.foobar);
expect(state.foobar.foo).not.toBe(data.foobar.foo);