Jetpack: Calendly block: fails to load on Firefox due to regex error

[glendaviesnz]

Firefox appears to take exception to the regular expressions used in https://github.com/Automattic/jetpack/blob/master/extensions/blocks/calendly/utils.js#L1. The exception thrown causes the blocks not to load.

Steps to reproduce the issue

1. With jetpack beta blocks loaded add a calendly block in Chrome
2. Attempt to load the block in Firefox and you will see the below error:

If lines 1-32 of the utils file are commented out then the block loads in Firefox. At a glance it looks like these include lookbehinds which are not supported by firefox.

[arunsathiya]

I am not able to see the beta blocks on Safari either. Version 13.0.4 (15608.4.9.1.3) on macOS 10.15.2 - MacOS Catalina. Found when p58i-8tn-p2#comment-44412

[katiebethbrown]

Noting here that I can't see _any_ Jetpack blocks in Firefox when I'm proxied. If I unproxy the production JP blocks are visible.

So this seems to be blocked in some way related to proxied connections.

[arunsathiya]

Correction on my last comment: Same situation as @katiebethbrown. Cannot see any Jetpack blocks on Firefox and Safari.

[jeherve]

@katiebethbrown That's to be expected. When you're proxied, you'll be served a totally different bundle of blocks (including Beta blocks) on WordPress.com. The bug introduced with the new Calendly Beta block consequently impacts the whole bundle of blocks.

We're working on a fix in #14375.

[pablinos]

Fix is merged and deployed to wpcom, so you should be able to see the beta blocks in all browsers now.

[arunsathiya]

I confirm they are visible on Firefox and Safari now, thanks Jeremy and Paul!