spaceloop1/js/states/buy-battery.js

states.push({
	id: "buy-battery",
	button: "Buy Battery (₩500)",
	action: "Purchasing",
	duration: 300,
	requires: () => {
		let enoughMoney = userData.money > 500;
		if (!enoughMoney) {
			errorMessage = "Not enough money to buy battery";
			return false;
		}
		let confirmPurchase = confirm(`Are you sure you want to purchase another battery for ₩500?`);
		return confirmPurchase;
	},
	run: () => {
		userData.money -= 500;
		userData.maxBattery += 50;
	}
});