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What about this?

class Foo { 
  static { 
    this.foo = 42; 
  } 
} 

class Foo {
  #_ = (() => {
    this.foo = 42; 
  })();
}

It is completely self-contained (it doesn't leak .init()), and we don't need to transpile it further in browsers with support for static private fields.

@nicolo-ribaudo The class element initializer does not have access to the initialized class name binding.

class Foo {
  #_ = (() => {
    Foo.foo = 42; // <-- Foo here is undefined
  })();
}

My mistake, I meant the private field to be static:

class Foo {
  static #_ = (() => {
    this.foo = 42; 
    console.log(Foo);
  })();
}

In chromium this works, I'm now checking the spec to understand where the binding is initialized.

EDIT: https://tc39.es/proposal-static-class-features/#runtime-semantics-class-definition-evaluation - The binding is initialized at step 30.a, and the static field is evaluated at step 34.a.

We should also test how this behaves with the private fields transform (plugin ordering 😛).

(If we detect the wrong order, we can just throw an error asking users to swap the two plugins)

We should also test how this behaves with the private fields transform (plugin ordering 😛).

@nicolo-ribaudo Yes that is how I am gonna fix "you should specify a test" error on node 10.