Populate unpopulated reaction.users - node.js

Question

On a messageReactionAdd event, one of the parameters is a MessageReaction. From that reaction, I do message.reaction to find the message that the reaction is from. I want to use that message to find all the reactions that the parameters user has reacted to on that message.
However, one obstacle is that when the bot restarts, it seems as though the message.reactions is not fully populated, and the data needs to be fetched. I need the users of a looped reaction, but I'm struggling on that part.
I have tried:
await message.reactions.reduce((p, c) => c.fetchUsers(), 0);
// I had thought this would of cached the users of every reaction on the message, but that did not work.
// next
message.reactions.forEach((x, y) => {
x.fetchUsers();
});
// this was also the same train of thought, but still to no avail.
What I mean by that users are not in the message.reaction.users object, I mean this:
// the bot restarts - and a reaction is added
console.log(reaction.users);
// outputs: Collection [Map] {}
// this is supposed to be populated with many users, but it's empty
// however, if I add ANY reaction again, not doing anything else
// it outputs a Collection with many users in it, which is expected
I have no idea how to do this.
Edit: relevant code
// raw.js (the raw event)
const events = {
MESSAGE_REACTION_ADD: 'messageReactionAdd',
};
const Discord = require('discord.js');
module.exports = async (client, event) => {
if (!events.hasOwnProperty(event.t)) return;
const { d: data } = event;
const user = client.users.get(data.user_id);
if (!user) return;
const channel = client.channels.get(data.channel_id);
if (!channel) return;
if (channel.messages.has(data.message_id)) return;
const message = await channel.fetchMessage(data.message_id);
const emojiKey = (data.emoji.id) ? `${data.emoji.name}:${data.emoji.id}` : data.emoji.name;
let reaction = message.reactions.get(emojiKey);
if (!reaction) {
const emoji = new Discord.Emoji(client.guilds.get(data.guild_id), data.emoji);
reaction = new Discord.MessageReaction(message, emoji, 1, data.user_id === client.user.id);
}
client.emit(events[event.t], reaction, user);
};
// messageReactionAdd.js (the messageReactionAdd event)
module.exports = async (client, reaction, user) => {
const message = reaction.message;
if (!message)
return;
//await message.reactions.reduce((p, c) => c.fetchUsers(), 0);
message.reactions.forEach((x,y) => {
x.fetchUsers();
});
reactions = await message.reactions.filter(r => r.users.has(`${user.id}`));
console.log(reactions);
};

Answer 1

This code is what fixed this problem for me.
// raw.js event file
await reaction.message.reactions.forEach(r => {
r.fetchUsers({before: `${reaction.message.author.id}`});
});
// emit the messageReactionAdd event
// messageReactionAdd.js event file
// the message.reactions.users should be populated, which I can use
reactions = await reaction.message.reactions.filter(r => r.users.has(`${reaction.message.author.id}`));
I had used this code in the wrong events which made no logical sense which made the results that I had thought was invalid.