Readonly class for immutable data objects

[matthew-hallsworth]

I use this class a lot in our application to build immutable data objects that I can pass around and be sure that the object has not changed from instantiation. However, we can now define a class as a readonly class instead of putting readonly against every attribute of the class.

When I try to readonly a class that extends the Spatie\LaravelData\Data class, I get the following problem in my IDE:

'readonly' class cannot extend non-readonly class 'Data'

I'm wondering if there is a way to allow for immutable data objects in future revisions of the project? Or if there is a way to do this already, unfortunately after scouring the docs I just couldn't find it or it's in a place that's hard to find.

Thanks!

Matt

[rubenvanassche]

Since the Data class is basically just some traits and interfaces, it shouldn't be too hard to create a readonly version. Notice: you will only be able to use constructor promoted properties, other properties are set by data outside of the constructor which isn't valid according to the readonly spec.