Ah yes, my bad. `var`!
On Mon, Apr 24, 2017 at 3:43 PM, Allen Wirfs-Brock <al...@wirfs-brock.com>
wrote:
>
> On Apr 24, 2017, at 12:34 PM, Bradley Meck <bradley.m...@gmail.com> wrote:
>
> To an extent, yes. You can use hoisting of function declarations and
> circular dependencies to create a "gateway". During circular dependencies,
> you have a time where function declarations are available but evaluation
> has not occured. During that time you can setup your private state. Then,
> immediately on evaluation, remove your gateway.
>
> ```
> // file: ./secrets
>
> // import all friendly modules (note: all dependencies of these modules
> could access GATEWAY)
> import './a'
> GATEWAY = void 0;
>
>
> // storage for shared secrets
> let SECRET;
>
>
> Really clever!
>
> Doesn’t this need to be a `var` declaration. Otherwise, the initial test
> of SECRET will be in its TDZ the first time GATEWAY is called.
>
>
> // gateway
> function GATEWAY() {
> if (!SECRET) SECRET = {};
> return SECRET;
> }
> export {GATEWAY};
> ```
>
> ```
> // file: ./a
> import {GATEWAY} from './secrets';
> if (typeof GATEWAY !== 'function') {
> throw Error('import secrets *first*.');
> }
> const SECRET = GATEWAY();
> ```
>
> With Realms (https://github.com/tc39/proposal-realms) you may be able to
> use the completion value of Module Evaluation to also achieve a way to
> share private state in a more sane way. VM implementations allow this in
> some ways as well : https://github.com/v8/v8/blob/
> a71c338d9e24e55b47125108a0fce754076751d0/include/v8.h#L1109
>
>
>
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