GraphQLScalarType

const DateType = new GraphQLScalarType({
  name: 'DateType',
  description: '自定义时间类型',
  parseValue: String,
  serialize(value) {
    return value.toString();
  },
  parseLiteral(ast) {
    if (!moment(ast.value).isValid()) {
      throw new GcBaseError('非法时间');
    }
    return ast ? ast.value : null;
  },
});