How To Get The Client Object In The Launchfile?

I have a Discord Bot which needs sharding now. I created a file named "botlaunch.js", which I start from the console (pm2 start botlaunch.js). In this file is all stuff you need for sharding.

Here is how my botlaunch.js looks like:

const Discord = require('discord.js');
const settings = require('./settings.json');
const chalk = require('chalk');

const shardingManager = new Discord.ShardingManager('./lenoxbot.js',
        {
            token: settings.token
        });


    shardingManager.spawn('auto', 500).then(() => {
        console.log(chalk.green(`[ShardManager] Started ${shardingManager.totalShards} shards`));
    }).catch(error => {
        console.log(error);
    });

I need to access the client object after this code. I tried it with the following function but this doesn't work either. No errors or something like this, it only returns undefined for everything I request, doesn't matter what:

function exec(script) {
            let requestId = 0;
            const currentRequestId = requestId++;

            process.send({ cmd: 'exec', script: script, reqId: currentRequestId });

            const promiseExec = new Promise(resolve => {
                _promiseQueue[currentRequestId] = resolve;
            });
            const promiseTimer = new Promise((resolve, reject) => {
                setTimeout(() => {
                    reject('Promise timed out before completion @ LenoxBotLauncher/exec');
                }, 60 * 1000);
                _promiseQueue.delete(currentRequestId);
            });

            return Promise.race([promiseExec, promiseTimer]);
        }

Do you have any solutions on how I can use the client under the code of my botlaunch.js?

You could use ShardingManager#broadcastEval() if you want to obviously eval something, if you need some properties use ShardingManager#fetchClientValues() like:

shardingManager.fetchClientValues('guilds.size')
.then(results => {
    console.log(`${results.reduce((prev, guildCount) => prev + guildCount, 0)} total guilds`);
})
.catch(console.error);

If you want to broadcastEval/fetchClientValues from inside the Bot you can use client.shard.fetchClientValues()/client.shard.broadcastEval()

There is also a nice guide about it here: https://discordjs.guide/sharding/#broadcasteval

Another way would be to use 2 Clients instead of the ShardingManager like:

const client1 = new Discord.Client({ shardId: 0, shardCount: 2});
const client2 = new Discord.Client({ shardId: 1, shardCount: 2});

This would mean that the bot will run in 1 process only and this might cause performance issues.