@boem312/minecraft-server/src/classes/utils/Client/events/arm_animation.js

A pure JS library to create Minecraft Java 1.16.3 servers

module.exports = {
    arm_animation({ hand }) {
        //todo: add check to check if hand is 1 or 0, and emit misbehavior CustomError if not
        const isMainHand = hand === 0;

        this.p.emit('armSwing', isMainHand);
    }
}