Paper/src/main/java/net/minecraft/server/IRecipe.java

package net.minecraft.server;

public interface IRecipe {

    boolean a(InventoryCrafting inventorycrafting);

    ItemStack b(InventoryCrafting inventorycrafting);

    int a();

    ItemStack b();

    org.bukkit.inventory.Recipe toBukkitRecipe(); // CraftBukkit
}