Private (#) getter in JavaScript

Question

Are private getters/setters planned to be supported in JavaScript?

class Next {
  #private = 0
  get #computed() { // SyntaxError: Unexpected token (
    return this.#private + 1
  }
}

If not, what is the rationale behind that?
I suppose implementation wouldn't be a hurdle. Are there objections to the functionality itself?

Answer 1

Update - ECMAScript 2021

With the latest es2021 version Private getters and setters are also possible.

Your code should be valid now:

class Next {
  #private = 0
  get #computed() { 
   return this.#private + 1
  }
}

Answer 2

Yes, they're part of the private methods and accessors proposal, a follow-on to class fields. The syntax is exactly as you've shown it. JavaScript engines are actively working to implement them, and Babel has working transpilation for them via the @babel/plugin-proposal-private-methods plugin.

Those two proposals are joined by the static class features proposal which covers static public properties, static private fields, and static private methods (including accessors).