feat: Change default storage to localStorage+cookie, store client session props

[robbie-c]

Changes

Didn't need to change much as the localStorage+cookie already handles the migration! Just needed to change the default, sanity check that tests work, and add my own key to the list of cookie-persisted keys.

Supercedes: #875
Related to: https://github.com/PostHog/product-internal/pull/531 and #876

Before we merge, let's merge this first PostHog/posthog.com#7095 and make sure that nothing catches fire

• merged it

Checklist

• Tests for new code (see advice on the tests we use)
• Accounted for the impact of any changes across different browsers

[github-actions]

Size Change: +777 B (0%)

Total Size: 746 kB

Filename	Size	Change
dist/array.full.js	176 kB	+195 B (0%)
dist/array.js	118 kB	+194 B (0%)
dist/es.js	118 kB	+194 B (0%)
dist/module.js	118 kB	+194 B (0%)

ℹ️ View Unchanged

Filename	Size
dist/exception-autocapture.js	12 kB
dist/recorder-v2.js	104 kB
dist/recorder.js	58.4 kB
dist/surveys.js	41.5 kB

_{compressed-size-action}

[pauldambra]

Looks good to me. Pulled and ran locally and it migrated me to localStorage+cookie

[benjackwhite]

Wat. This already supports migrating? I had no idea :D

[posthog-bot]

This PR hasn't seen activity in a week! Should it be merged, closed, or further worked on? If you want to keep it open, post a comment or remove the stale label – otherwise this will be closed in another week.

[benjackwhite]

I'm going to pull out the changed default stuff only and not the client_session_props.

Reason being - we might need to reconsider the approach given what we are learning about the cookie size and content potentially triggering things like Cloudflares security challenges

[posthog-bot]

This PR hasn't seen activity in a week! Should it be merged, closed, or further worked on? If you want to keep it open, post a comment or remove the stale label – otherwise this will be closed in another week.

[posthog-bot]

This PR was closed due to lack of activity. Feel free to reopen if it's still relevant.