Function patchFingerprint

src/ui/diff/useHighlightedDiff.ts:70–78

Content fingerprint from the diff patch. Changes whenever the underlying diff * changes, allowing per-file cache invalidation without a global flush.

(file: DiffFile)

/** Content fingerprint from the diff patch. Changes whenever the underlying diff
 *  changes, allowing per-file cache invalidation without a global flush. */
function patchFingerprint(file: DiffFile) {
  const { patch } = file;
  if (patch.length === 0) {
    return metadataFingerprint(file);
  }

  const mid = Math.floor(patch.length / 2);
  return `${patch.length}:${patch.slice(0, 64)}:${patch.slice(mid, mid + 64)}:${patch.slice(-64)}`;
}

/** Cache key that includes a content fingerprint so stale entries are never served
 *  after reload. Unchanged files keep their cache hit across reloads. */