Currently if I want to subclass the System loader I need to do something
like -
var newLoader = new Loader(System);
newLoader.fetch = function() {
// ...
}
Effectively we're monkey-patching, which isn't pretty.
It would be nice to be able to do:
class newLoader extends System.constructor {
constructor(loaderConfig) {
this.baseURL = loaderConfig.baseURL;
// ...
}
fetch: function() {
super.fetch
}
}
In order to allow this, we would need to first define a SystemLoader class,
and make System an instance of it.
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