feat(feature-flags): Enable bootstrapping the library #444
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Changes
Allows for initialising the library with a distinctID, and/or feature flags as well. This id is treated as an anonymous ID, unless you explicitly say that it's not.
This allows for immediate flag availability on load, and makes possible to do things like: redirect pages based on feature flags (which wouldn't have been possible earlier, since the flags take some time to load)
@mariusandra , @Twixes , have a look here for how I expect this to be used: PostHog/posthog#11704 -> just a PoC, to help review this PR, if you want interface changes, etc. etc.
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Tested by running locally with the PoC PR, see everything works as expected.
Checklist