resourceAt method
The latest write of key at or before passIndex, or null.
Implementation
CapturedResource? resourceAt(String key, int passIndex) {
CapturedResource? best;
for (final resource in resources) {
if (resource.key != key) continue;
if (resource.passIndex > passIndex) continue;
if (best == null || resource.passIndex > best.passIndex) best = resource;
}
return best;
}