node:events:492
      throw er; // Unhandled 'error' event
      ^

DiscordAPIError[0]: 405: Method Not Allowed
    at handleErrors (C:\Users\Hp\Desktop\Botv14\node_modules\@discordjs\rest\dist\index.js:687:13)
    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
    at async SequentialHandler.runRequest (C:\Users\Hp\Desktop\Botv14\node_modules\@discordjs\rest\dist\index.js:1072:23)
    at async SequentialHandler.queueRequest (C:\Users\Hp\Desktop\Botv14\node_modules\@discordjs\rest\dist\index.js:913:14)
    at async _REST.request (C:\Users\Hp\Desktop\Botv14\node_modules\@discordjs\rest\dist\index.js:1218:22)
    at async module.exports (C:\Users\Hp\Desktop\Botv14\Loaders\loadSlashCommands.js:28:5)
    at async module.exports (C:\Users\Hp\Desktop\Botv14\Events\ready.js:6:5)
Emitted 'error' event on Client instance at:
    at emitUnhandledRejectionOrErr (node:events:395:10)
    at process.processTicksAndRejections (node:internal/process/task_queues:84:21) {
  requestBody: {
    files: undefined,
    json: [
      SlashCommandBuilder {
        options: [],
        name: 'ping',
        name_localizations: undefined,
        description: 'Affiche la latence du bot',
        description_localizations: undefined,
        default_permission: undefined,
        default_member_permissions: null,
        dm_permission: false,
        nsfw: undefined
      }
    ]
  },
  rawError: { message: '405: Method Not Allowed', code: 0 },
  code: 0,
  status: 405,
  method: 'PUT',
  url: 'https://discord.com/api/v10/applications/1139567824604516443/commands/undefined'
}

Node.js v18.17.0

node:events:492
      throw er; // Unhandled 'error' event
      ^

DiscordAPIError[0]: 405: Method Not Allowed
    at handleErrors (C:\Users\Hp\Desktop\Botv14\node_modules\@discordjs\rest\dist\index.js:687:13)
    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
    at async SequentialHandler.runRequest (C:\Users\Hp\Desktop\Botv14\node_modules\@discordjs\rest\dist\index.js:1072:23)
    at async SequentialHandler.queueRequest (C:\Users\Hp\Desktop\Botv14\node_modules\@discordjs\rest\dist\index.js:913:14)
    at async _REST.request (C:\Users\Hp\Desktop\Botv14\node_modules\@discordjs\rest\dist\index.js:1218:22)
    at async module.exports (C:\Users\Hp\Desktop\Botv14\Loaders\loadSlashCommands.js:28:5)
    at async module.exports (C:\Users\Hp\Desktop\Botv14\Events\ready.js:6:5)
Emitted 'error' event on Client instance at:
    at emitUnhandledRejectionOrErr (node:events:395:10)
    at process.processTicksAndRejections (node:internal/process/task_queues:84:21) {
  requestBody: {
    files: undefined,
    json: [
      SlashCommandBuilder {
        options: [],
        name: 'ping',
        name_localizations: undefined,
        description: 'Affiche la latence du bot',
        description_localizations: undefined,
        default_permission: undefined,
        default_member_permissions: null,
        dm_permission: false,
        nsfw: undefined
      }
    ]
  },
  rawError: { message: '405: Method Not Allowed', code: 0 },
  code: 0,
  status: 405,
  method: 'PUT',
  url: 'https://discord.com/api/v10/applications/1139567824604516443/commands/undefined'
}

Node.js v18.17.0

const Discord = require('discord.js')
const { REST } = require("@discordjs/rest")
const { Routes } = require("discord-api-types/v10")

module.exports = async bot => {

    let commands = [];

    bot.commands.forEach(async command => {

        let slashcommand = new Discord.SlashCommandBuilder()
        .setName(command.name)
        .setDescription(command.description)
        .setDMPermission(command.dm)
        .setDefaultMemberPermissions(command.permission === "Aucune" ? null : command.permission)

        if(command.options?.length >= 1) {
            for(let i = 0; i < command.options.length; i++) {
                slashcommand[`add${command.options[i].type.slice(0,1).toLowerCase() + command.options[i].type.slice(1, command.options[i].type.length)}Option`](option => option.setName(command.options[i].name).setDescription(command.options[i].description).setRequired(command.options[i].required))
            }
        }

        await commands.push(slashcommand)
    })
    
    const rest = new REST ({version: "10"}).setToken(bot.token)

    await rest.put(Routes.applicationCommand(bot.user.id), {body: commands})
    console.log("Les slash commandes ont été ajoutées")
}

const Discord = require('discord.js')
const { REST } = require("@discordjs/rest")
const { Routes } = require("discord-api-types/v10")

module.exports = async bot => {

    let commands = [];

    bot.commands.forEach(async command => {

        let slashcommand = new Discord.SlashCommandBuilder()
        .setName(command.name)
        .setDescription(command.description)
        .setDMPermission(command.dm)
        .setDefaultMemberPermissions(command.permission === "Aucune" ? null : command.permission)

        if(command.options?.length >= 1) {
            for(let i = 0; i < command.options.length; i++) {
                slashcommand[`add${command.options[i].type.slice(0,1).toLowerCase() + command.options[i].type.slice(1, command.options[i].type.length)}Option`](option => option.setName(command.options[i].name).setDescription(command.options[i].description).setRequired(command.options[i].required))
            }
        }

        await commands.push(slashcommand)
    })
    
    const rest = new REST ({version: "10"}).setToken(bot.token)

    await rest.put(Routes.applicationCommand(bot.user.id), {body: commands})
    console.log("Les slash commandes ont été ajoutées")
}