Question

开玩笑给我的测试套件结果是“ TypeError：构造函数集需要'new'”

.babelrc配置为：

   select prod_a as "Prod",
          prod as "Range of Amounts",
          value as "Mean Price"
     from  
            (
            with tablea(prod,amt,price) as
            (
              select 'X',100,1 from dual union all
              select 'X',180,2 from dual union all
              select 'X',250,3 from dual union all
              select 'Y',90, 2 from dual union all
              select 'Y',170,3 from dual union all
              select 'Y',280,3 from dual 
            )
            select prod as prod_a,  
            avg(case when amt between 0 and 200 then price end) as avg_0_200,
            avg(case when amt between 150 and 300 then price end) as avg_150_300
            from tablea a
            group by prod
             ) b  
    unpivot(value for prod in(avg_0_200,avg_150_300))
    order by prod_a;

   Prod  Range of Amounts   Mean Price
   ----  ----------------    ----------
   X     AVG_0_200              1.5
   X     AVG_150_300            2.5
   Y     AVG_0_200              2.5
   Y     AVG_150_300            3

测试套件：

{
  "presets": [["env", { "modules": false }]],
  "env": {
    "test": {
      "presets": [["env"]]
    }
  }
}

预计该测试将通过。而是显示错误：

test('Constructor Set requires "new"', () => {
  class A extends Set {
    constructor(...arg) {
      super(...arg);
      this.add(10);
    }
  }

  const a = new A([1, 2]);
  expect([...a][2]).toEqual(10);
});

Answer 1

要解决此问题，必须为preset-env插件设置目标。对于jest，它是node。（可以将其放在"test"的{{1}}部分中）

.bybelrc

TypeError：构造函数集需要“ new”

1 个答案: