$UniversalAdId.fromJson constructor Null safety

$UniversalAdId.fromJson(
  1. Map _json
)

Implementation

$UniversalAdId.fromJson(core.Map _json)
    : this(
        registry: _json.containsKey('registry')
            ? _json['registry'] as core.String
            : null,
        value:
            _json.containsKey('value') ? _json['value'] as core.String : null,
      );