clsext.js

'use strict';

console.log(process.version)

class A extends Error {}

console.log(new A() instanceof Error)

output

» babel-node ./clsext.js
v0.10.46
true

package.json

{
  "name": "experiments",
  "devDependencies": {
    "babel-preset-es2015": "^6.14.0"
  },
  "babel": {
    "presets": [
        "es2015"
    ]
  }
}