How would you process and resize an uploaded image in Node.js using the sharp library, and why is sharp generally preferred over pure-JavaScript alternatives?

sharp is a high-performance image-processing library built on the native libvips library, dramatically faster and more memory-efficient than pure-JavaScript image manipulation for common operations like resizing, format conversion, and compression -- since libvips processes images in a streaming fashion internally, sharp can resize very large images without loading the entire uncompressed bitmap into memory the way some pure-JS libraries need to.

const sharp = require('sharp');

await sharp(uploadedFilePath)
  .resize(800, 600, { fit: 'inside' })
  .jpeg({ quality: 80 })
  .toFile('resized-output.jpg');