You don't need JSON.parse there - see `Object.getPrototypeOf({
['__proto__']: null }) !== null`.
On Wed, Sep 26, 2018 at 10:27 AM, Mike Samuel <mikesam...@gmail.com> wrote:
> Might it be a spec bug that in the below, o's prototype changes, and o.x
> !== b.x?
>
> const a = makeIntercepter();
> const b = { x: 1 };
> const o = Object.assign(
> {},
> a,
> b);
>
> console.log(`o is plain Object: ${ Object.getPrototypeOf(o) ===
> Object.prototype }`);
>
> console.log(`b.x=${ b.x }, o.x=${ o.x }`);
>
> function makeIntercepter() {
> return JSON.parse(
> // Get an object that has an actual "__proto__" property.
> '{ "__proto__": {} }',
> // Replace the __proto__ property's value with one that
> // traps assignment to x.
> (key, value) => (
> (key === '__proto__')
> ? {
> set x(v) {
> console.log(`intercepted ${ v }`);
> },
> get x() {
> return 2;
> },
> }
> : value));
> }
>
> In modern Chrome, Firefox, Safari I get
> intercepted 1
> getPrototypeOf(o)===Object.prototype: false
> b.x=1, o.x=2
>
>
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> https://mail.mozilla.org/listinfo/es-discuss
>
>
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