How to read file with async/await? - discord.js

Question

const Discord = require('discord.js');
const { MessageEmbed } = require('discord.js');
const fs = require('fs');
module.exports = {
name: 'prefix',
aliases: ['setprefix'],
description: 'Установить новый префикс на вашем сервере',
execute(message, args) {
if (!message.member.hasPermission('MANAGE_SERVER'))
return message.reply(' Не не не.');
if (!args[0] || args[0 == 'help'])
return message.reply(`Использование: prefix <Тут ваш префикс> `);
let prefixes = JSON.parse(fs.readFileSync('./prefixes.json', 'utf8'));
prefixes[message.guild.id] = {
prefix: args[0]
};
fs.writeFile('./prefixes.json', JSON.stringify(prefixes), (err) => {
if (err) console.log(err)
})
let pEmbed = new MessageEmbed()
.setColor('#000001')
.setTitle('Префикс изменён!')
.setDescription(`Новый префикс на сервере **${args[0]}**`)
message.channel.send(pEmbed)
message.delete({ timeout: 10000 })
}}
let prefixes = JSON.parse(fs.readFileSync('./prefixes.json', 'utf8'));
if (!prefixes[message.guild.id]) {
prefixes[message.guild.id] = {
prefix: config.prefix
};
}
let prefix = prefixes[message.guild.id].prefix;
if i'm change prefix, bot stopping music.
Tried to do it via ' ReadFile`, it returns me a callback error
I know I could use readFileSync, but if I do, I know I'll never understand async/await and I'll just bury the issue.
UPD:
client.on('message', async (message) => {
if (message.author.bot) return;
if (!message.guild) return;
let prefixes = JSON.parse(fs.readFileSync('./prefixes.json', 'utf8'));
if (!prefixes[message.guild.id]) {
prefixes[message.guild.id] = {
prefix: config.prefix
};
}
let prefix = prefixes[message.guild.id].prefix;
// let msgArray = message.content.split(" ");
// let cmd = msgArray[0];
// if(cmd.slice(0, prefix.length) !== prefix) return;
// let args = msgArray.slice(1);
// let cmdFile = client.commands.get(cmd.slice(prefix.length))
// if(cmdFile) cmdFile.run(client, message, args);
const prefixRegex = new RegExp(`^(<#!?${client.user.id}>|${escapeRegex(prefix)})\\s*`);
if (!prefixRegex.test(message.content)) return;
const [matchedPrefix] = message.content.match(prefixRegex);
const args = message.content.slice(matchedPrefix.length).trim().split(/ +/);
const commandName = args.shift().toLowerCase();
const command =
client.commands.get(commandName) ||
client.commands.find((cmd) => cmd.aliases && cmd.aliases.includes(commandName));
if (message.content.startsWith(prefix) && commandFiles) {
if (message.deletable) {
try {
await message.delete();
} catch(e) {
console.error(e);
}
}
}
if (!command) return;
if (!cooldowns.has(command.name)) {
cooldowns.set(command.name, new Collection());
}
const now = Date.now();
const timestamps = cooldowns.set(command.name);
const cooldownAmount = (command.cooldown || 1) * 1000;
if (timestamps.has(message.author.id)) {
const expirationTime = timestamps.get(message.author.id) + cooldownAmount;
if (now < expirationTime) {
const timeLeft = (expirationTime - now) / 1000;
return message.reply(
`Пожалуйста подождите ${timeLeft.toFixed(1)} секунд перед повторным использованием \`${command.name}\` команд.`
);
}
}
timestamps.set(message.author.id, now);
setTimeout(() => timestamps.delete(message.author.id), cooldownAmount);
try {
command.execute(message, args);
} catch (error) {
console.error(error);
message.reply('Произошла ошибка при выполнении этой команды.')
.then(message => message.delete({ timeout: 5000 }))
.catch(console.error);
}
});

Answer 1

fs doesn't offer the possibility to give the Promise of a file, but it can read a file asynchronously with a callback instead of a promise. But in the fs module, you can use fs/promises (aka fs.promises). Here's the same code. I corrected 1 problem, added the fsp var (fs promises), and used it to read your prefixes.json file. fs.readFileSync is totally fine though.
const Discord = require("discord.js");
const { MessageEmbed } = require("discord.js");
const fs = require("fs");
const fsp = fs.promises; // ++
module.exports = {
name: "prefix",
aliases: ["setprefix"],
description: "Установить новый префикс на вашем сервере",
async execute(message, args) {
if (!message.member.hasPermission("MANAGE_SERVER"))
return message.reply(" Не не не.");
if (!args[0] || args[0] == "help") /** Correction */
return message.reply(`Использование: prefix <Тут ваш префикс> `);
let prefixes = JSON.parse(await fsp.readFile("prefixes.json", "utf8")); // Using fsp
prefixes[message.guild.id] = {
prefix: args[0],
};
fs.writeFile("./prefixes.json", JSON.stringify(prefixes), (err) =>
err ? console.error(err) : null
);
let pEmbed = new MessageEmbed()
.setColor("#000001")
.setTitle("Префикс изменён!")
.setDescription(`Новый префикс на сервере **${args[0]}**`);
message.channel.send(pEmbed);
message.delete({ timeout: 10000 });
},
};