buildValidatedRemoteConfigDefaults function

@visibleForTesting Map<String, dynamic> buildValidatedRemoteConfigDefaults(Map<String, dynamic>? additionalDefaultConfigs)

Merges DreamIC's AppConfigBase.defaultRemoteConfig with the consumer-supplied additionalDefaultConfigs and validates that every value in the merged map is a bool, num, or String — the only types Firebase Remote Config setDefaults accepts.

Throws an ArgumentError (matching Firebase's own setDefaults guard, which throws ArgumentError on null) naming each offending 'key' = RuntimeType if any value is unsupported. This guard runs on every init path (live, mock, emulator) so a bad consumer default surfaces in local development rather than first crashing app startup on the live Remote Config path.

Exposed via @visibleForTesting (mirroring the @visibleForTesting setters in AppConfigBase) so validator tests can call it directly without a Firebase-init/GetIt harness.

Implementation

@visibleForTesting
Map<String, dynamic> buildValidatedRemoteConfigDefaults(
  Map<String, dynamic>? additionalDefaultConfigs,
) {
  final merged = <String, dynamic>{
    ...AppConfigBase.defaultRemoteConfig,
    ...?additionalDefaultConfigs,
  };

  final offenders = <String>[];
  merged.forEach((key, value) {
    if (value is! bool && value is! num && value is! String) {
      offenders.add("'$key' = ${value.runtimeType}");
    }
  });

  if (offenders.isNotEmpty) {
    throw ArgumentError(
      'Invalid Remote Config default value(s): ${offenders.join(', ')}. '
      'Firebase Remote Config defaults must be bool, num, or String. '
      'An unsupported value would otherwise crash app startup on the live '
      'Remote Config path (FirebaseRemoteConfig.setDefaults rejects it).',
    );
  }

  return merged;
}