fetch with progress

index.js

// (c) @rdvornov

const response = await fetch('... url goes here ...');
const progressProxyResponse = new Response(new ReadableStream({
  async start(controller) {
    const totalSize = Number(response.headers.get('content-length'));
    const reader = response.body.getReader();
    let loadedSize = 0;

    while (true) {
      const { done, chunk } = await reader.read();

      if (done) {
        controller.close();
        break;
      }

      controller.enqueue(chunk);
      loadedSize += chunk.length;
      console.log(`Received ${loadedSize} of ${totalSize}`);
    }
  }
}));

const data = await progressProxyResponse.json();