如何解决NodeJS JavaScript中的...错误

我是新来的NodeJS。这是代码：

const a = [
    {
        wa_id: 1,
        wa_property_id: 'p1',
        wa_view_name: 'ram',
        wa_view_id:1
    },
    {
        wa_id: 1,
        wa_property_id: 'p1',
        wa_view_name: 'sam',
        wa_view_id:'v2'
    },
    {
        wa_id: 1,
        wa_property_id: 'p2',
        wa_view_name: 'kam',
        wa_view_id:'v3'
    },
    {
        wa_id: 2,
        wa_property_id: 'p5',
        wa_view_name: 'pri',
        wa_view_id:'v4'
    },
    {
        wa_id: 1,
        wa_property_id: 'p3',
        wa_view_name: 'ste',
        wa_view_id:'v5'
    },
];

var result = a.reduce((acc,rec) =>{
//if result object doesn't contain key for wa_id - add new id key
if(!(Object.keys(acc).includes(rec.wa_id.toString())))
{
  return {...acc, [rec.wa_id]: {[rec.wa_property_id]:{[rec.wa_view_id]:rec.wa_view_name}}}
}
//if result id object doesn't contain key for property - add new property key
if(!(Object.keys(acc[rec.wa_id]).includes(rec.wa_property_id.toString())))
{
    // acc[rec.wa_id] = {...acc[rec.wa_id],[rec.wa_property_id]:[rec.wa_view_name] }
    acc[rec.wa_id] = {...acc[rec.wa_id],[rec.wa_property_id]:{[rec.wa_view_id]:rec.wa_view_name} }
  return acc
}
//otherwise add new value to array of properties
acc[rec.wa_id][rec.wa_property_id][rec.wa_view_id] = rec.wa_view_name
return acc
},{})

console.log("Output: ",result)

我收到以下错误。下面的错误图片，

它正在在线上工作Javascript Code Editor。但是在我的系统中，它显示了以上错误。在Internet上进行一些搜索之后，我知道我nodejs不支持...如何使其支持。我正在使用最新Node JS版本（我的节点js版本：v12.16.1）。为我提供一些解决方案。

(base) paulsteven@smackcoders:~/data-filters/flax2.0/flax_back_end$ node -v
v12.16.1