bot-discord-coins/fonctions/getPrefix.js

const db = require('./database.js');

module.exports = async function getPrefix(serverId) {
  const prefix = await new Promise((resolve, reject) => {
    db.get(`SELECT * FROM config WHERE guildId = ? AND name = ?`, [serverId, 'prefix'], (err, row) => {
      if (err) reject(err);
      resolve(row);
    });
  });

  return prefix ? prefix.value : '&';
}