Share a secret across ES6 specific modules, so that other modules cannot access the secret?

Mike Samuel mikesamuel at
Sun Apr 15 18:58:09 UTC 2018

The box function defined in enables
things like this.

On Sun, Apr 23, 2017 at 4:42 PM, /#!/JoePea <joe at> wrote:

> Is there a way to share some secret value across a few modules, and
> prevent other modules? f.e. prevent modules of an app dev who is importing
> modules of a library where the library wants to share private stuff across
> its modules. Is this possible to implement somehow?
> WeakMaps can be encapsulated inside a module to implement "private"
> properties for a class defined inside that module and then exported. But
> "protected" can't be implemented with a WeakMap shared with modules because
> then end-user app code can import the WeakMap and read all the stuff. Is
> there some way to share a WeakMap private with classes defined across
> modules?
> */#!/*JoePea
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