fromJson static method

RecordStringBeforeStringOrNullAfterStringOrNullValue? fromJson(dynamic value)

Returns a new RecordStringBeforeStringOrNullAfterStringOrNullValue instance and imports its values from value if it's a Map, null otherwise.

Implementation

// ignore: prefer_constructors_over_static_methods
static RecordStringBeforeStringOrNullAfterStringOrNullValue? fromJson(dynamic value) {
  if (value is Map) {
    final json = value.cast<String, dynamic>();

    // Ensure that the map contains the required keys.
    // Note 1: the values aren't checked for validity beyond being non-null.
    // Note 2: this code is stripped in release mode!
    assert(() {
      assert(json.containsKey(r'after'), 'Required key "RecordStringBeforeStringOrNullAfterStringOrNullValue[after]" is missing from JSON.');
      assert(json.containsKey(r'before'), 'Required key "RecordStringBeforeStringOrNullAfterStringOrNullValue[before]" is missing from JSON.');
      return true;
    }());

    return RecordStringBeforeStringOrNullAfterStringOrNullValue(
      after: mapValueOfType<String>(json, r'after'),
      before: mapValueOfType<String>(json, r'before'),
    );
  }
  return null;
}