send file discord js v12

If you want to send a file with Discord.js v12, the best way to do so is to use the MessageAttachment class. This class allows you to create a new attachment object, which can then be sent as part of a message. Here's an example of how to send a file with Discord.js v12:

const Discord = require('discord.js');
const message = new Discord.Message();

const attachment = new Discord.MessageAttachment('path/to/file.txt');

message.channel.send(attachment);

The above code will send the file located at path/to/file.txt as an attachment in the same channel as the message. You can also use the MessageAttachment class to send files with a custom name, or to send files from a URL instead of from the file system. For more details on how to do this, please refer to the Discord.js v12 documentation.