javascript - How to get old message reactions

Question

What I'm trying to do is to get username for users who reacts on that message. It's working good but when the bot restarts only new reactions work. how to make it send all users reactions

client.on('ready', () => {
   client.guilds.get('guild_id').channels.get('chnl_id').fetchMessage('msg_id');
});
client.on('messageReactionAdd', (reaction, user) => {
    const { message} = reaction;
    if(message.channel.id == 'chnl_id'){
      if(reaction.emoji.name === "?") {
    message.guild.fetchMember(user.id).then(member => {
      if(user.bot)  return;
    else {
         message.channel.send(reaction.users.map(u => u.username.toString()))
        }
    })
    }}});

Answer 1

If you have the message, then you can filter the reaction of that message by emojis:

const reaction = await message.reactions.cache.filter(r=> r.emoji.name === '?').first().fetch();

Then you can fetch all reactions with that specific emoji:

await reaction.users.fetch();

Then you can filter from that if you want to (for example your own bot), with:

const filteredReactions = reaction.users.cache.filter(r=> !r.bot);

And don't forget to put these in an async function.