updateComponent instead of addComponent?

[linonetwo]

I find addComponent won't update existing value. So always have to check if it already exists

    if ('sacrificePendingDamage' in actor && actor.sacrificePendingDamage !== undefined) {
      actor.sacrificePendingDamage += hpCost;
    } else {
      ECS.world.addComponent(actor, 'sacrificePendingDamage', hpCost);
    }

is this correct?

I expect an API like useEffect that receive an update function

ECS.world.updateComponent(actor, 'sacrificePendingDamage', (current) => (current ?? 0) + hpCost);

And it create the compoent if not exist. Auto remove & add component if exist (so it will reindex it).

And to make it works with react, you even have to #317 (comment)