feat: Allow changing persistence

[benjackwhite]

Changes

Fixes #1024

• Also adds tailwind to the next playground

Allows doing something like this:

// Cookieless tracking with swap to cookie-full tracking when enabled
let cookieOptIn = () => localStorage.getItem("cookie-opt-in") === "true"

posthog.init(KEY, { persistence: cookieOptIn() ? "localStorage+cookie" : "memory" }

function optInToCookies() {
    localStorage.setItem("cookie-opt-in", "true")
    posthog.update_config({ persistence: "localStorage+cookie" })
}

Follow up

• Update docs and notify team to update tutorials (to answer these questions 1 2

Checklist

• Tests for new code (see advice on the tests we use)
• Accounted for the impact of any changes across different browsers
• Accounted for backwards compatibility of any changes (no breaking changes in posthog-js!)

[github-actions]

Size Change: +18.5 kB (+2%)

Total Size: 863 kB

Filename	Size	Change
dist/array.full.js	183 kB	+468 B (0%)
dist/array.js	125 kB	+466 B (0%)
dist/es.js	125 kB	+466 B (0%)
dist/module.js	125 kB	+466 B (0%)
dist/recorder-v2.js	106 kB	+1.17 kB (+1%)
dist/surveys.js	64.3 kB	+15.5 kB (+32%)	🚨

ℹ️ View Unchanged

Filename	Size
dist/exception-autocapture.js	12 kB
dist/recorder.js	58.6 kB
dist/surveys.esm.js	64.2 kB

_{compressed-size-action}

[pauldambra]

i trust you ran it locally and since the new test passes this looks good to me

[mariusandra]

Had a look through the code, but didn't run. What I saw looks good, and seconding Paul: seems like the test passes, so I trust it works.