[CodeGenerator:] Generate component interfaces

The problem

You are allowed to write this

entity.health.value = 42;

but you shouldn’t. You always should replace components like this

entity.ReplaceHealth(42);

The solution

This

entity.health.value = 42;

should result in a compile error.

The Plan

Declare your components with the partial keyword and getters and setters

public partial class HealthComponent : IComponent {
    public int value { get; set; }
}

The code generator should generate

// Getter only
public interface IHealthComponent : IComponent {
    int value { get; }
}

// Make component sealed and implement interface
public sealed partial class HealthComponent : IHealthComponent {
}

All the generated API of other generators will use the interface instead of the component which means this

entity.health.value = 42;

will result in a compile error 👍

Make Entitas safe again!

[sschmid]

The goal is not to remove flexibility but to make it harder to write code with bugs

[sschmid]

just had another real-life issue from a user that called e.position.x = 42; I think that feature really helps reducing bugs