RoughlyEnoughItems/src/main/java/me/shedaniel/rei/mixin/MixinTabGetter.java

package me.shedaniel.rei.mixin;

import me.shedaniel.rei.api.TabGetter;
import net.minecraft.client.gui.ingame.CreativePlayerInventoryScreen;
import org.spongepowered.asm.mixin.Mixin;
import org.spongepowered.asm.mixin.Shadow;

@Mixin(CreativePlayerInventoryScreen.class)
public class MixinTabGetter implements TabGetter {
    
    @Shadow
    private static int selectedTab;
    
    @Override
    public int rei_getSelectedTab() {
        return selectedTab;
    }
    
}