const { SiteClient } = require('datocms-client');
async function run() {
  const client = new SiteClient('YOUR-API-TOKEN');
  
  const uploadId = '666';
  const upload = await client.upload.destroy(uploadId);
  
  console.log(upload);
}
run();

> node example.js
{
  "id": "666",
  "size": 444,
  "width": 30,
  "height": 30,
  "path": "/45/1496845848-digital-cats.jpg",
  "basename": "digital-cats",
  "filename": "digital-cats.jpg",
  "url": "https://www.datocms-assets.com/45/1496845848-digital-cats.jpg",
  "format": "jpg",
  "author": "Mark Smith",
  "copyright": "2020 DatoCMS",
  "notes": "Nyan the cat",
  "md5": "873c296d0f2b7ee569f2d7ddaebc0d33",
  "duration": 62,
  "frameRate": 30,
  "blurhash": "LEHV6nWB2yk8pyo0adR*.7kCMdnj",
  "muxPlaybackId": "a1B2c3D4e5F6g7H8i9",
  "muxMp4HighestRes": "high",
  "defaultFieldMetadata": {
    "en": {
      "title": "this is the default title",
      "alt": "this is the default alternate text",
      "customData": {
        "foo": "bar"
      },
      "focalPoint": {
        "x": 0.5,
        "y": 0.5
      }
    }
  },
  "isImage": true,
  "createdAt": "2020-04-21T07:57:11.124Z",
  "updatedAt": "2020-04-21T07:57:11.124Z",
  "mimeType": "image/jpeg",
  "tags": [
    "cats"
  ],
  "smartTags": [
    "robot-cats"
  ],
  "exifInfo": {
    "iso": 10000,
    "model": "ILCE-7",
    "flashMode": 16,
    "focalLength": 35,
    "exposureTime": 0.0166667
  },
  "colors": [
    {
      "red": 206,
      "green": 203,
      "blue": 167,
      "alpha": 255
    },
    {
      "red": 158,
      "green": 163,
      "blue": 93,
      "alpha": 255
    }
  ],
  "creator": "312"
}