Postea/src/main/java/com/myname/mymodid/mixins/PosteaLoadingPlugin.java

package com.myname.mymodid.mixins;

import com.gtnewhorizon.gtnhmixins.IEarlyMixinLoader;
import cpw.mods.fml.relauncher.FMLLaunchHandler;
import cpw.mods.fml.relauncher.IFMLLoadingPlugin;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Set;

@IFMLLoadingPlugin.MCVersion("1.7.10")
public final class PosteaLoadingPlugin implements IEarlyMixinLoader, IFMLLoadingPlugin {

    @Override
    public String[] getASMTransformerClass() {
        return null;
    }

    @Override
    public String getAccessTransformerClass() {
        return null;
    }

    @Override
    public String getModContainerClass() {
        return null;
    }

    @Override
    public String getSetupClass() {
        return null;
    }

    @Override
    public void injectData(Map<String, Object> data) {}

    @Override
    public String getMixinConfig() {
        return "mixins.mymodid.early.json";
    }

    @Override
    public List<String> getMixins(Set<String> loadedCoreMods) {
        final List<String> mixins = new ArrayList<>();
        mixins.add("MixinItemStack");
        if (FMLLaunchHandler.side().isClient()) {
            // register client only mixins here,
            // that is mixins that target client classes
            // such as net.minecraft.client.Minecraft class
        }
        return mixins;
    }
}