const attachment = Attachment.fromString('photo123_456', vk.api);

if (attachment1.equals('photo123_456')) {
  console.log('Same attachment');
}

const str = attachment.toString(); // "photo123_456" or "photo123_456_abc"

await photo.loadAttachmentPayload();
console.log(photo.largeSizeUrl);

const largeSizes = photo.getSizes(['w', 'z']);

const photo = new PhotoAttachment({
  api: vk.api,
  payload: {
    id: 456,
    owner_id: 123,
    sizes: [/* ... */],
  },
});

await photo.loadAttachmentPayload();
console.log(photo.largeSizeUrl);
console.log(photo.width, photo.height);

import { transformAttachments } from 'vk-io';

const attachments = transformAttachments(rawAttachments, vk.api);

import { PhotoAttachment, VideoAttachment } from 'vk-io';

// Create from payload
const photo = new PhotoAttachment({
  api: vk.api,
  payload: {
    id: 456,
    owner_id: 123,
    sizes: [/* ... */],
  },
});

// Parse from string
const video = Attachment.fromString('video123_456', vk.api) as VideoAttachment;

// Load full data
await video.loadAttachmentPayload();
console.log(video.title, video.duration);

// Use in messages
await vk.api.messages.send({
  peer_id: userId,
  message: 'Check this out!',
  attachment: [photo.toString(), video.toString()].join(','),
});