es-feature-detection/syntax/es2016.json

{
  "Exponentiation operator": "2**3",
  "Rest destructuring": {
    "Rest parameter destructuring": "function f(a,{b:{c}},...[d,...e]){}",
    "Nested rest destructuring": "var {a:{b,c}}={a:{b:1,c:2}}"
  }
}