A push reaction is what happens when a piston tries to push a block.

It might be required for you to import the package if you encounter any issues, so better be safe than sorry and add the import.
import mods.contenttweaker.PushReaction;

You can see if two reactions are equal by using the == operator.

ZenScript
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if(a == b){}

You can use these methods to get PushReaction Objects:

ZenScript
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mods.contenttweaker.PushReaction.normal();
mods.contenttweaker.PushReaction.destroy();
mods.contenttweaker.PushReaction.block();
mods.contenttweaker.PushReaction.ignore();
mods.contenttweaker.PushReaction.pushOnly();