Extract events from main world to render world

main.rs

use bevy::{
    prelude::*,
    render::{Extract, RenderApp},
};

fn main() {
    App::new()
        .add_plugins(DefaultPlugins)
        .add_event::<FooEvent>()
        .add_plugins(ExractEventPlugin)
        .add_systems(Update, update)
        .run();
}

#[derive(Event, Clone, Copy)]
struct FooEvent;

fn update(mut events: EventWriter<FooEvent>, time: Res<Time>, mut event_written: Local<bool>) {
    if !*event_written && time.elapsed_secs() > 1.0 {
        println!("write event in main world");
        events.write(FooEvent);
        *event_written = true;
    }
}

struct ExractEventPlugin;
impl Plugin for ExractEventPlugin {
    fn build(&self, app: &mut App) {
        if let Some(render_app) = app.get_sub_app_mut(RenderApp) {
            render_app.add_systems(ExtractSchedule, extract_event);
        }
    }
}

fn extract_event(mut extracted_events: Extract<EventReader<FooEvent>>) {
    for _ev in extracted_events.read() {
        println!("event received in render world");
    }
}