TransformStream

deezer-web-streams-4.js

const source = new ReadableStream({…}); // As seen above
const destination = new WritableStream({…}); // As seen above

const transformer = new TransformStream({
  transform(chunk, controller) {
    // Simply increment each bytes
    const transformed = chunk.map(value => Math.min(value + 1, 255));

    // Enqueue the transformed data
    controller.enqueue(transformed);
  }
});

source
  .pipeThrough(transformer);
  .pipeTo(destination);