lua-api.factorio.com/latest/prototypes/RecipeCategory.html
Description field:

RecipeCategory 'recipe-category'

A recipe category. The built-in categories can be found here . See RecipePrototype::category . Recipe categories can be used to specify which machine can craft which recipes .

The ...

I'm writing a mod to conditionally disable cloud effects while the editor is open.

LuaSurface::show_clouds lets us toggle cloud shadows ( CloudsEffectProperties ) at runtime. Would you please implement a similar function to toggle the fog effects ( FogEffectProperties ) used on Vulcanus and Gleba ...

Necro post, but I came across the function definition and remembered seeing this thread while looking for something else.

The code that OP linked can be found here .
This is a local table (array), so where is it used? It's used in two LuaTilePrototype declarations in the same file. Here's one of ...

classes/LuaSurface.html#show_clouds
Is this value always true unless a mod sets it false? I don't see a 1:1 equivalent in the prototypes or settings.