BlockHarvestDropsEvent

The BlockHarvestDrops Event is fired whenever a block is about to drop its items.
You can modify the block list as well as the overall drop chance. Set latter to 1 if you do all chance handling beforehand.

Event Class

You will need to cast the event in the function header as this class:
crafttweaker.event.BlockHarvestDropsEvent
You can, of course, also import the class before and use that name then.

Event interface extensions

BlockHarvestDrops Events implement the following interfaces and are able to call all of their methods/getters/setters as well:

ZenGetters

The following information can be retrieved from the event:

ZenGetter ZenSetter Type
player IPlayer
isPlayer bool
silkTouch bool
fortuneLevel int
drops drops List<IItemStack>
dropChance dropChance float

Adding an item to the list

You can either addAssign the list or use the method to add an item to the list:

event.drops += <minecraft:coal>;
event.addItem(<minecraft:coal>);