Command handler “require is not a function” error (JavaScript)

client.events = new Discord.Collection();
['event_handler', 'command_handler'].forEach(handler =>{
    require(`./handlers/${handler}`)(client, Discord);
})

Have that, and for some reason the console says “require is not a function”. Error right below:

    require(`./handlers/${handler}`)(client, Discord);
                                    ^

TypeError: require(...) is not a function

What can I do to fix this? I tried everything I could but no luck.