Importing the class

Link to importing-the-class

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.

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import crafttweaker.api.util.InteractionHand;

InteractionHand is an enum. It has 2 enum constants. They are accessible using the code below.

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InteractionHand.MAIN_HAND
InteractionHand.OFF_HAND