The event is not cancelable.

The event does not have a result.

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.forge.api.event.entity.player.PlayerBreakSpeedEvent;

PlayerBreakSpeedEvent extends PlayerEvent. That means all methods available in PlayerEvent are also available in PlayerBreakSpeedEvent

Name	Type	Has Getter	Has Setter
Name newSpeed	Type float	Has Getter true	Has Setter true
Name originalSpeed	Type float	Has Getter true	Has Setter false
Name position	Type BlockPos?	Has Getter true	Has Setter false
Name state	Type BlockState	Has Getter true	Has Setter false