// import the uploader library
const Uploader = require("revolt-uploader");

// you have to initialize a revolt.js client object as well.
// Then initialize the uploader and provide it with the client
const uploader = new Uploader(client);

// you need to attach this to a message, meaning you need to have a message object
// you can get this by listening for the `message` event on the client object but this is up to you
client.on("message", (message) => {
  // the upload method will return an attachment id that you can add to the message
  Promise.allSettled([
    uploader.uploadFile("path/to/file", "file"),
    uploader.uploadFile("path/to/another/file", "another-file"),
  ]).then(attachments => { // we're using Promise.allSettled to asynchronously upload all of them
    attachments = attachments.map(attachment => attachment.value); // extracting the value from the promises
    // send the attachment to the channel
    message.channel.sendMessage({
        content: "Here is your file!",
        attachments: attachments // Note that attachments always has to be an array, even if you're only uploading one file
    });
    // All done!
  });

  // async/await approach:
  message.channel.sendMessage({
    content: "Here is your file!",
    attachments: [await uploader.uploadFile("/path/to/another/file", "file-name")]
  });
});

const id = await uploader.uploadUrl("url", "fileName");

const https = require("https");

client.on("message", (message) => {
  https.get("<url>", (response) => {
    message.channel.sendMessage({
      content: "Downloaded file: ",
      attachments: [await uploader.upload(response, "file.filetype")]
    });
  });
});