if that would be possible, then everyone could just monkey patch `Object`, right?
I'm not sure I'd be up for it On Tue, Oct 24, 2017 at 1:56 PM, Boris Cherny <[email protected]> wrote: > This feels like a problem similar to https://esdiscuss.org/ > topic/block-scoped-prototype-extensions > > On Oct 24, 2017, at 9:50 AM, /#!/JoePea <[email protected]> wrote: > > Is it possible to monkey-patch an intermediate constructor of a built-in > subclass? > > For example, suppose I want all `Element` instances in a web app to have > new instance properties, is there a way to monkey-patch the Element > constructor so that when I make a custom element by extending a subclass of > `Element` that the new logic will fire? > > For example: > > ```js > // monkey-patch the Element constructor somehow so that it logs "patched > in Element". > > // then > class FooBar extends HTMLElement {} > customElement.define('foo-bar', FooBar) > new FooBar // "patched in Element" > ``` > > I tried > > ```js > const OldElement = window.Element > > window.Element = function Element() { > const _this = new OldElement > console.log("patched in Element") > return _this > } > > window.Element.prototype = OldElement.prototype > window.Element.prototype.constructor = window.Element > > class FooBar extends HTMLElement {} > customElements.define('f-b', FooBar) > new FooBar // does not log "patched in Element" > ``` > > But when I make a new custom element, constructing it seems to use the old > Element constructor, as if a non-global reference to the original > constructor is kept inside a module so that modifying the global wouldn't > have any effect. > > Is there a way to monkey patch a constructor in the middle of a built-in > prototype chain or to otherwise inject construction logic to base classes > of existing class hierarchies? > > > */#!/*JoePea > > > _______________________________________________ > es-discuss mailing list > [email protected] > https://mail.mozilla.org/listinfo/es-discuss > >
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