ComputedPropertyName, StringLiteral and NumericLiteral in object destructuring

[nicolo-ribaudo]

Consider this (valid) code:

const { ["z"]: a, 1: b, "x": c } = { z: 2, 1: 3, x: 4 };

Errors reported by JSHint:

Expected an identifier and instead saw '['.
Expected ',' and instead saw 'z'.
Expected an identifier and instead saw ']'.
Expected an identifier and instead saw '1'.
Expected an identifier and instead saw 'x'.

---

Spec:
12.14.5 Destructuring Assignment

AssignmentPattern_[Yield] :
  ObjectAssignmentPattern_[?Yield]
  ...

ObjectAssignmentPattern[Yield] :
  ...
  { AssignmentPropertyList_[?Yield] }
  { AssignmentPropertyList_[?Yield] , }

AssignmentPropertyList_[Yield] :
  AssignmentProperty_[?Yield]
  AssignmentPropertyList_[?Yield] , AssignmentProperty_[?Yield]

AssignmentProperty_[Yield] :
  ...
  PropertyName : AssignmentElement_[?Yield]

Definition of PropertyName:
12.2.5 Object Initializer

PropertyName_{[Yield,GeneratorParameter]} :
  LiteralPropertyName
  [+GeneratorParameter] ComputedPropertyName
  [~GeneratorParameter] ComputedPropertyName_[?Yield]

LiteralPropertyName :
  IdentifierName
  StringLiteral
  NumericLiteral

[lukeapage]

and supported by babel.js - http://babeljs.io/repl/#?experimental=true&evaluate=true&loose=false&spec=false&code=const%20{%20[%22z%22]%3A%20a%2C%201%3A%20b%2C%20%22x%22%3A%20c%20}%20%3D%20{%20z%3A%202%2C%201%3A%203%2C%20x%3A%204%20}%3B%0A