feat: Sentry integration

[benjackwhite]

Clone of https://github.com/PostHog/posthog-js-lite/pull/120

Changes

Resolves #106 by porting the Sentry integration from posthog-js to posthog-js-lite. I have decided to port this for Node only for now, since I don’t think (??) posthog-js is in production yet. If we were to rely on a common core here some of the code would have to change.

I am also unsure of how this library wants to differ from posthog-js—the main edits I made were stylistic, and I tried to type everything a bit more strongly, which was the… vibe I’m getting from this repo? So I’m submitting this PR early and we can figure out what you actually want here (I also didn’t write tests). I will leave comments with questions.

Testing Strategy

I tested this manually by compiling the library & patching it into my own app. I tested that:

• Sentry URL is attached to PostHog events and resolves correctly (only on sentry.io)
• PostHog Person URL is attached to Sentry events and resolves correctly (only on eu.posthog.com)

I am happy to write a test (how?) or test more extensively, wanted to wait until we had a more-reviewed PR before we do that.

(@benjackwhite - added tests)

Release info Sub-libraries affected

Bump level

• [ ] Major
• [x] Minor
• [ ] Patch

Libraries affected

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

Changelog notes

• Added posthog.SentryIntegration to posthog-node. Usage:

Sentry.init({
     dsn: 'https://example',
     integrations: [
         new posthog.SentryIntegration(posthog)
     ]
})

Sentry.setTag(posthog.POSTHOG_ID_TAG, 'some distinct id');

[huw]

Easy, I’m following this one now

[marandaneto]

After this PR it'd be cool to have docs -> https://posthog.com/docs/libraries/node similar to https://posthog.com/docs/libraries/python#sentry so it's more discoverable.

[benjackwhite]

After this PR it'd be cool to have docs -> https://posthog.com/docs/libraries/node similar to https://posthog.com/docs/libraries/python#sentry so it's more discoverable.

Yep was just doing this :D