"Can't find DragEvent" error on mobile web

[andyzg]

Bug description

We've been getting a lot of errors from Sentry with the following

Upon saving the client side source code, I grep'ed DragEvent and could only find an instance of it from posthog's source code. This only happens on certain mobile browsers.

Please describe.
If this affects the front-end, screenshots would be of great help.

Expected behavior

DragEvent shouldn't be accessed as a variable unless it's defined.

How to reproduce

Unable to reproduce given that I don't know the code path that triggers DragEvent. I currently get it via Sentry.

Environment

• PostHog Cloud
• self-hosted PostHog, version/commit: please provide

Additional context

Thank you for your bug report – we love squashing them!

[mariusandra]

We also have one such report in our sentry.

It seems the bug comes from the the session recorder (recorder.js). Possibly updating rrweb in posthog-js might fix it... To be continued.

[andyzg]

Hey @mariusandra , any ideas on whether this would break the web app? We're still seeing the error pretty frequently and aren't sure how to reproduce on our devices.

If you know when this would get resolved, that would be great!

[studious]

We are also getting a lot of these errors since we deployed the posthog client today. They are all from TouchMove on devices where DragMove doesn't exist.

t instanceof MouseEvent
? e.IncrementalSource.MouseMove
: t instanceof DragEvent
  ? e.IncrementalSource.Drag
  : e.IncrementalSource.TouchMove

[mariusandra]

Hey, it seems that this issue is fixed upstream by rrweb-io/rrweb#630 and rrweb-io/rrweb#652 . Unfortunately those changes are not yet released in a new 1.0.3 version of rrweb.

@Yuyz0112 I see you made a commit to release 1.0.3, but then it was never published. Is there any way to get this version out? :)

[Yuyz0112]

@mariusandra 1.0.3 has been published now.

[Twixes]

Thank you @Yuyz0112!