fix(flags): Handle payloads correctly

[neilkakkar]

Problem

Fixes https://github.com/PostHog/posthog/issues/21768

Noticed payloads are handled very messily, and some existing tests for these were wrong 🫠. Now always simulates how things should be in production, with the decide response returning stringified payloads.

The code now always parses payloads once: when we get the response from decide (or local eval), and everything else can assume the payload is an object. This means we don't need to faff around parsing everywhere, which is nice.

Ran locally against production and can confirm everything works nicely now.

Changes

Release info Sub-libraries affected

Bump level

• [ ] Major
• [ ] Minor
• [x] Patch

Libraries affected

• [ ] All of them
• [ ] posthog-web
• [x] posthog-node
• [x] posthog-react-native

Changelog notes

• Added support for X

[github-actions[bot]]

Size Change: +121 B (0%)

Total Size: 72.9 kB

Filename	Size	Change
posthog-node/lib/index.cjs.js	19.8 kB	+39 B (0%)
posthog-node/lib/index.esm.js	19.7 kB	+40 B (0%)
posthog-web/lib/index.cjs.js	16.7 kB	+21 B (0%)
posthog-web/lib/index.esm.js	16.7 kB	+21 B (0%)

_{compressed-size-action}

[marandaneto]

Missing changelog for https://github.com/PostHog/posthog-js-lite/blob/main/posthog-web/CHANGELOG.md

[neilkakkar]

thanks, added!