ecmascript 6 - ES6 getter/setter with arrow function

Question

I'm using babel6 and for my pet project I'm creating a wrapper for XMLHttpRequest, for the methods I can use:

open = (method, url, something) => {
  return this.xhr.open(method, url, something);
}

but for the properties arrow function doesn't work

this works:

get status() { return this.xhr.status; }

but I can not use

get status = () => this.xhr.status;

Is this intentional?

Answer 1

According to the ES2015 grammar, a property on an object literal can only be one of four things:

PropertyDefinition:

• IdentifierReference
• PropertyName : AssignmentExpression
• MethodDefinition

The only one of these type that allows a leading get is MethodDefinition:

MethodDefinition :

• PropertyName ( StrictFormalParameters ) { FunctionBody }
• GeneratorMethod
• get PropertyName ( ) { FunctionBody }
• set PropertyName ( PropertySetParameterList ) { FunctionBody }

As you can see, the get form follows a very limited grammar that must be of the form

get NAME () { BODY }

The grammar does not allow functions of the form get NAME = ....