record method

void record(Map<String, num> measured, { required String ref, })

Records measured medians as goldens for ref and writes the store when anything changed. Prints one recorded line per metric and a final wrote line — the CLI log the CI publishes.

Implementation

void record(Map<String, num> measured, {required String ref}) {
  final file = File(path);
  final dynamic doc = file.existsSync()
      ? jsonDecode(file.readAsStringSync())
      : <String, Object?>{'metrics': <String, Object?>{}};
  final metrics =
      (doc['metrics'] as Map<String, dynamic>).cast<String, Object?>();

  var changed = false;
  final keys = measured.keys.toList()..sort();
  for (final metric in keys) {
    final golden = measured[metric];
    if (golden == null) continue;
    final metricDoc = metrics.putIfAbsent(
      metric,
      () => <String, Object?>{'unit': metric, 'goldens': <String, Object?>{}},
    ) as Map<String, dynamic>;
    final goldens = metricDoc.putIfAbsent(
        'goldens', () => <String, Object?>{}) as Map<String, dynamic>;
    goldens[ref] = golden;
    stdout.writeln('recorded $metric = $golden (ref=$ref)');
    changed = true;
  }
  if (changed) {
    file.writeAsStringSync(const JsonEncoder.withIndent('  ').convert(doc));
    stdout.writeln('wrote $goldensPath');
  }
}