Archiver les messages discord d'un channel

Archive.js

const { Client } = require('discord.js')
const fs = require('fs')

const client = new Client()

client.on('ready', async () => {
    console.log('bot ready')

    const guild = client.guilds.get('297780867286433792')

    //const channels = ['297868535076749323'].map(channel => guild.channels.get(channel))
    const channels = guild.channels

    const start = new Date().getTime()

    await channels.filter(channel => channel.fetchMessages)
        .reduce((acc, cur) => acc.then(() => fetchChannel(cur)).catch(console.error), Promise.resolve())
    //might throw permission errors (ignored)

    console.log('Took ' + (new Date().getTime() - start) + 'ms' )

    console.log('ended')

    await client.destroy()
    process.exit(-1)
})

client.login(process.env.DISCORD_TOKEN)

async function fetchChannel(channel) {
    console.log('STARTED FETCH FOR CHANNEL "' + channel.name + '" (' + channel.id + ')')

    let messages = [];

    let next = 1
    let before = null
    const start = new Date().getTime()
    while (next) {
        const res = await channel.fetchMessages({ limit: 100, before })
        const fetched = Array.from(res.values())

        if (!fetched.length) {
            next = false
            continue
        }

        messages = messages.concat(fetched.map(msg => ({
            id: msg.id,
            author: {
                id: msg.author.id,
                username: msg.author.username,
                descriminator: msg.author.discriminator,
                displayAvatarURL: msg.author.displayAvatarURL
            },
            content: msg.content,
            cleanContent: msg.cleanContent,
            createdAt: msg.createdAt,
            pinned: msg.pinned,
            type: msg.type,
            attachments: Array.from(msg.attachments.values()).map(obj => delete obj.client && delete obj.message),
            embeds: msg.embeds.map(obj => {
                delete obj.client
                delete obj.message
                obj.author && delete obj.author.embed
                obj.fields.forEach(field => delete field.embed)
                obj.footer && delete obj.footer.embed
                obj.image && delete obj.image.embed
                obj.provider && delete obj.provider.embed
                obj.thumbnail && delete obj.thumbnail.embed
                obj.video && delete obj.video.embed
                return obj
            }),
            mentions: {
                channels: Array.from(msg.mentions.channels.values()).map(({ id, name }) => ({ id, name })),
                everyone: msg.mentions.everyone,
                users: Array.from(msg.mentions.users.values()).map(({ id, username, descriminator, displayAvatarURL }) => ({ id, username, descriminator, displayAvatarURL })),
                roles: Array.from(msg.mentions.roles.values()).map(({ color, createdAt, id, name, mentionable, permissions, position }) => ({ color, createdAt, id, name, mentionable, permissions, position }))
            },
            webhookID: msg.webhookID,
            tts: msg.tts,
            editedAt: msg.editedAt
        })))

        console.log(messages.length + ' fetched')
        next = fetched.length >= 100
        before = fetched[fetched.length - 1].id

        console.log((messages.length / ((new Date().getTime() - start) / 1000)).toFixed(3) + '/s')
    }

    console.log('FINISHED FETCH FOR CHANNEL "' + channel.name + '" (' + channel.id + ')')

    const file = channel.name + '['+channel.id+'].json'

    console.log('WRITING JSON IN ' + file)

    fs.writeFileSync('out/' + file, JSON.stringify(messages, null, 2))

    console.log('FINISHED WRITING JSON IN ' + file) 
}