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src/lib/download.ts

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// src/lib/download.ts
// Browser-side helper to trigger a file download from a Blob.

export function downloadBlob(blob: Blob, filename: string): void {
  const url = URL.createObjectURL(blob);
  const a = document.createElement('a');
  a.href = url;
  a.download = filename;
  a.rel = 'noopener';
  // Some browsers require the element to be in the DOM for the click to fire.
  document.body.appendChild(a);
  a.click();
  a.remove();
  // Revoke after a tick so the browser has time to start the download.
  setTimeout(() => URL.revokeObjectURL(url), 1000);
}