help with creating an mlua api to spawn a cube

[last glade]

use bevy::prelude::*;
use mlua::prelude::*;

fn main() {
    App::new()
        .add_plugins(DefaultPlugins)
        .add_systems(Startup, run_lua)
        .run();
}

fn newObject(_: &Lua, type: String) -> LuaResult<()> {
    commands.spawn((
        Mesh3d(meshes.add(Cuboid::new(1.0, 1.0, 1.0))),
        MeshMaterial3d(materials.add(Color::srgb_u8(124, 144, 255))),
        Transform::from_xyz(0.0, 0.5, 0.0),
    ));
    Ok(())
}

fn run_lua(
    mut commands: Commands,
    mut meshes: ResMut<Assets<Mesh>>,
    mut materials: ResMut<Assets<StandardMaterial>>,
) {
    let lua = Lua::new();

    lua.globals()
        .set("create_new", lua.create_function(newObject).unwrap())
        .unwrap();
    lua.load(std::fs::read_to_string("./test.lua").unwrap())
        .exec()
        .unwrap();
}

I want to be able to do something like this, but I have no idea how to access commands, meshes and materials from within the newObject function. (I'm new to both Rust and Bevy. If you reply, please explain as well as possible so that I can understand)
Any help is appreciated!

[somber chasm]

write the cubes to a global table and read from that table after the execution

fn run_lua(
    mut commands: Commands,
    mut meshes: ResMut<Assets<Mesh>>,
    mut materials: ResMut<Assets<StandardMaterial>>,
) {
    let lua = Lua::new();

    lua.globals()
        // i don't know the correct name for here
        .set("cubes", lua.create_table().unwrap())
        .unwrap();
    lua.load(std::fs::read_to_string("./test.lua").unwrap())
        .exec()
        .unwrap();
    // i don't know the correct name for here
    for cube in lua.get_global("cubes") {
      commands.spawn((
        Mesh3d(meshes.add(Cuboid::new(1.0, 1.0, 1.0))),
        MeshMaterial3d(materials.add(Color::srgb_u8(124, 144, 255))),
        Transform::from_xyz(0.0, 0.5, 0.0),
      ));
    }
}

[last glade]

I would prefer if I can create new objects while the lua is executing and not after it's finished

[somber chasm]

commands are deferred anyway

so you wouldn't be able to manipulate an entity created with Commands until next frame

[last glade]

Really? Wow ok thanks, I'll try your solution tomorrow

[somber chasm]

it is not really next frame, but next checkpoint, but it is still in a different system from the one where it was called

[last glade]

Say I want my lua script to create a new object and then immediately move this object that I just created? That wouldn't work then?

[somber chasm]

it would need to be 2 different systems

or create already on the moved position