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I'm assuming that you are looking for the least-verbose way of doing this.

Most likely this would be achieved by using Object.assign:

The Object.assign() method copies all enumerable own properties from one or more source objects to a target object.

in your case, the target object is element and the only source object here would be config:

Inside the handler, you call console.log(target, thisArg, args); where target and thisArg are functions. The devtools console appears to use .toString() to get the name of the function to display it.

Maybe using the __mock__ directory can help you.

from the docs:

Manual mocks are defined by writing a module in a mocks/ subdirectory immediately adjacent to the module. For example, to mock a module called user in the models directory, create a file called user.js and put it in the models/mocks directory.

You can also mock modules from the node_modules directory.

Manual Mocks

(V8 developer here.)

Both the ECMAScript standard itself and engines' implementations of it evolve by adding individual features one by one.

The "TC39" committee discusses new proposed features. Once a feature has been agreed upon, it is added to the standard (see the "Process" document @Bergi linked in his comment for more details). The yearly "releases" of ECMAScript are just snapshots of this continuous process.

Engines typically implement a new feature either shortly before it is finalized (so that implementation feedback can inform the standardization discussion) or shortly after.

Rewriting an entire JavaScript engine from scratch every year would be a huge waste of effort: most of the language doesn't change. Also, rewriting an entire JavaScript engine from scratch would take many years. (In fact, rewriting any software from scratch is almost always a bad idea, because you'll spend a huge amount of time just catching up with what the old version was able to do. Incremental improvements are almost always the better strategy.)

The majority of engine developers' time is typically spent on improving support for existing features and subsystems (compilers, garbage collectors, internal object model, ...), such as making them faster or more memory efficient.

You can just do document.querySelectorAll('.external a').forEach to iterate over all of them:

This attempt works for me.

Add a file named global.ts in your source folder:

You want to import a bundled version of the lib to be able to do that. Try:

Navigating within a Vaadin UI will change the URL in your browser, but it will not necessarily create a browser request to that exact URL, effectively bypassing the access control defined by Spring security for that URL. As such, Vaadin is really not suited for the request URL-based security approach that Spring provides. For this issue alone you could take a look at my add-on Spring Boot Security for Vaadin which I specifically created to close the gap between Spring security and Vaadin.

But while creating two distinct Spring security contexts based on the URL is fairly easy, this - for the same reason - will not work well or at all with Vaadin. And that's something even my add-on couldn't help with.

Update: As combining both security contexts is an option for you, I can offer the following solution (using my add-on): Starting from the Keycloak example, you would have to do the following:

1. Change WebSecurityConfig to also add your DB-based AuthenticationProvider. Adding your UserDetailsService should still be enough. Make sure to give every user a suitable role.
2. You have to remove this line from application.properties: codecamp.vaadin.security.standard-auth.enabled = false This will re-enable the standard login without Keycloak via a Vaadin view.
3. Adapt the KeycloakRouteAccessDeniedHandler to ignore all test views that shouldn't be protected by Keycloak.

I already prepared all this in Gitlab repo and removed everything not important for the main point of this solution. See the individual commits and their diffs to also help focus in on the important bits.