Prerender EAGERNERSS

[giorgiopellegrino]

Hello @addyosmani and @XhmikosR,

I have implemented a key feature for my company that allows prerendering URLs with an eagerness configuration. The fallback is a prefetch triggered on mouseenter when the eagerness property is set to "moderate" or "conservative."

Main changes:

1. Added functionality to prefetch elements corresponding to the URL upon the mouseenter event.
2. Added the handling of the eagerness attribute of the script in the speculation rules.
3. The prerender fallback for devices that do not handle speculation rules has been implemented by adding prefetch, triggered at the mouseenter, if the eagerness mode is ‘moderate’ or ‘conservative’.
4. All the functions added for prefetch and prerender are available in the listen function to options property, and they will only be executed when elements enter the viewport: options.onlyOnMouseover, options.eagerness

window.addEventListener('load', () => {
  quicklink.listen({el, priority, onlyOnMouseover,
                    prerender, eagerness});
});

quicklink.prefetch(url, isPriority, onlyOnMouseover);

quicklink.prerender(url | [urls], eagerness);

I hope these changes will be appreciated, as they are currently in use across our e-commerce platforms.

Thank you very much.

Giorgio Pellegrino.

cc @gilbertococchi

[addyosmani]

LGTM. Thanks for the contribution!

[addyosmani]

@giorgiopellegrino could i ask if you can resolve the conflicts introduced after we landed #435? Happy to land this after.

[giorgiopellegrino]

Hello @addyosmani ,

I’ve pulled the latest changes from the main branch and solved the conflicts.

Thank you for merging the pull requests!

Giorgio

cc @gilbertococchi

[addyosmani]

Thank you for resolving those merge conflicts. Very much appreciate it.

[addyosmani]

LGTM

[giorgiopellegrino]

Hi @addyosmani , thank you so much for completing the pull request!
cc @gilbertococchi

[addyosmani]

Thank you so much once again for all of your work on the recent pull requests. I really appreciate the improvements that you've been making to the library. I will aim to get these out in a new release soon. We're just going to try cleaning up some final additions that ideally get our CI passing again, but expect them to be in a stable release soon.