It might be required for you to import the package if you encounter any issues (like casting an Array), so better be safe than sorry and add the import at the very top of the file.

ZenScript
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import crafttweaker.api.villager.trade.type.ItemsForEmeralds;

ItemsForEmeralds implements the following interfaces. That means all methods defined in these interfaces are also available in ItemsForEmeralds

• ItemListing

ZenScript
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new ItemsForEmeralds(item as ItemDefinition, emeraldCost as int, numberOfItems as int, villagerXp as int) as ItemsForEmeralds
new ItemsForEmeralds(<item:minecraft:diamond>, 2, 4, 2);

Parameter	Type	Description
Parameter item	Type ItemDefinition	Description The Item that is being sold by the villager
Parameter emeraldCost	Type int	Description How many emeralds will be given to the villager
Parameter numberOfItems	Type int	Description The amount of the Item being sold to the villager
Parameter villagerXp	Type int	Description How much experience does this trade reward the villager

ZenScript
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new ItemsForEmeralds(block as Block, emeraldCost as int, numberOfItems as int, maxUses as int, villagerXp as int) as ItemsForEmeralds
new ItemsForEmeralds(<block:minecraft:dirt>, 2, 4, 8, 2);

Parameter	Type	Description
Parameter block	Type Block	Description The Block that is being sold by the villager
Parameter emeraldCost	Type int	Description How many emeralds will be given to the villager
Parameter numberOfItems	Type int	Description The amount of the Block being sold to the villager
Parameter maxUses	Type int	Description How many times can this trade be used
Parameter villagerXp	Type int	Description How much experience does this trade reward the villager

ZenScript
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new ItemsForEmeralds(itemStack as ItemStack, emeraldCost as int, numberOfItems as int, maxUses as int, villagerXp as int, priceMultiplier as float) as ItemsForEmeralds
new ItemsForEmeralds(<item:minecraft:diamond>, 2, 4, 8, 2, 0.05);

Parameter	Type	Description
Parameter itemStack	Type ItemStack	Description The Item that is being sold by the villager
Parameter emeraldCost	Type int	Description How many emeralds will be given to the villager
Parameter numberOfItems	Type int	Description The amount of the Item being sold to the villager
Parameter maxUses	Type int	Description How many times can this trade be used
Parameter villagerXp	Type int	Description How much experience does this trade reward the villager
Parameter priceMultiplier	Type float	Description How much the price is affected by demand, Hero of the Village, and village reputation