Cannot read property 'ping' of undefined

const client = require('../index.js');

module.exports = {
    name: 'latency',
    aliases: ['lat'],
    description: 'Let the Bot display your latency.',
    execute(message, args) {
        const m = message.channel.send("Pinging...");
            m.edit(`Your latency latency is ${m.createdTimestamp - message.createdTimestamp}ms.\nAPI Latency is ${Math.round(client.ws.ping)}ms`);
            message.delete().catch(O_o=>{});
                return
    }
        
};

So it sends "Pinging" but then I get the error:

Cannot read property 'ping' of undefined

and I don't know how or where I should define ping, does someone know?

Your issue seems like it's being caused by the way you're importing client, the best thing to do to fix your issue is by passing client in your execute() function in your command files and in your index.js