messages_count.js

// authenticates you with the API standard library
// type `await lib.` to display API autocomplete
const lib = require('lib')({token: process.env.STDLIB_SECRET_TOKEN});

// make API request
let messageslist = await lib.discord.channels['@0.2.2'].messages.list({
  channel_id: `${context.params.event.channel_id}`,
  limit: 1
});

//While loop init
let latestmessageID = `${messageslist[0].id}`;
let messageslistlength = 100;
let messagecounter = 1;
let whileloopcounter = 0;

let sleep = async (ms) => {
  return new Promise((resolve) => {
    setTimeout(resolve, ms);
  });
};

//While loop execute
while (messageslistlength === 100 && messagecounter < 2500) {
    whileloopcounter = whileloopcounter + 1;
    await sleep(630);    
    //Retrieve the 100max messages
    messageslist = await lib.discord.channels['@0.2.2'].messages.list({
      channel_id: `${context.params.event.channel_id}`,
      before: `${latestmessageID}`,
      limit: 100
    });
    messagecounter = messagecounter + messageslist.length;
    console.log(messagecounter);
    //While loop readjust
    messageslistlength = messageslist.length;
    latestmessageID = `${messageslist[(messageslistlength-1)].id}`;
}

if (messagecounter > 2499){
  let result = await lib.discord.channels['@0.2.2'].messages.create({
    channel_id: `${context.params.event.channel_id}`,
    content: `<@!${context.params.event.member.user.id}> : il y a sur ce fil plus de 2500 messages.`
  });
}
else {
  let result = await lib.discord.channels['@0.2.2'].messages.create({
    channel_id: `${context.params.event.channel_id}`,
    content: `<@!${context.params.event.member.user.id}> : il y a sur ce fil ${messagecounter} messages.`
  });
}