Update book write/sign packet for 1.20.5+

[usamiername]

• The FAQ doesn't contain a resolution to my issue

Versions

• mineflayer: latest
• server: 1.21
• node: 18

Detailed description of a problem

The book write/sign packet was changed in 1.20.5, therefore the solution between 1.18-1.20.4 does not work.

Your current code

const mineflayer = require("mineflayer")

const bot = mineflayer.createBot({
	host: "localhost",
	username: "username",
	port: 25567
})

bot.on("chat", (username, message) => {
	if (message === "book") {
		let inventory = bot.inventory;
		for (let i = 0; i < inventory.slots.length; i++) {
			if (inventory.slots[i]) {
				if (inventory.slots[i].type === 1091) {
					bot.equip(inventory.slots[i], "hand");
					bot.writeBook(bot.quickBarSlot + 36, ["test"]);
				};
			};
		};
	};
})

bot.on("kicked", console.log)
bot.on("error", console.log)

Expected behavior

When book is typed in the chat, the bot should equip a book and write a page containing "test" to it.

Actual behavior

The program will error and shut down with the message "TypeError: SizeOf error for undefined : Cannot read properties of undefined (reading 'length')"