E0208: cannot access private identifier outside class

The following code is accessing a private identifier outside the class.

class C {
  #x = 10;
}

function f(c) {
  c.#x = 20;
}

To fix this error, move function f as a static member of class C .

class C {
  #x = 10;
  static f(c) {
    c.#x = 20;
  }
}

Another way to fix this error, remove # before variable x.

class C {
  x = 10;
}

function f(c) {
  c.x = 20;
}

Introduced in quick-lint-js version 0.4.0.