vat fetch-blob.ts

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  import fs from 'node:fs/promises';
import url from 'node:url';
 
/**
 * Fetch a blob of bytes from a URL.
 *
 * This works like `fetch`, but handles `file:` URLs directly, since Node's
 * `fetch` implementation chokes on those.
 *
 * @param blobURL - The URL of the blob to fetch.
 * @returns A Response containing the requested blob.
 */
export async function fetchBlob(blobURL: string): Promise<Response> {
  const parsedURL = new URL(blobURL);
  if (parsedURL.protocol === 'file:') {
    return new Response(await fs.readFile(url.fileURLToPath(parsedURL)));
  }
  return fetch(blobURL);
}