[JavaScript] v9

[lforst]

The general topics for this major:

• Very little actual breakage
• API cleanup
• Behaviour cleanup

The items for this major can be found in #14224 (pre-work), #14225 (main work), #14288 (pre-release tasks) and #14226 (post-release tasks).

The following items are likely also gonna happen but need a bit more refinement and have dependencies on stakeholders outside of the JavaScript SDK.

Needs Refinement

Beta Give feedback

1. [v9] Update how sessions work in the browser #14478
   +0

We also include some stretch goals that may get pulled into the major if we deem it valuable:

Stretch Goals

Beta Give feedback

1. Removing SyncPromise
2. Node stack filenames should be relative to app root #9072
   Meta: Breaking Type: Improvement +2
3. Look into using TS flag --isolatedDeclarations #13885
   +0
4. Update max. breadcrumb handling on scope #12399
   +0
5. Replace sucrase with swc
6. requestDataIntegration improvements
7. Replace instances of PromiseLike with Promise
8. Default attachStackTrace to true and add option to disable stack trace attachment for individual capture*() calls
9. Simplify multiplexed transport API (micro-frontends/module metadata) #11230
   Type: Improvement +1

[mydea]

Bump minimum Node.js version to 16+

IMHO we can also look into going to 18+. Lots of stuff depends on 18+ 🤔

[AbhiPrasad]

We should re-evaluate our current session code (both server-side with request mode sessions and client-side).

I think we have the opportunity to extract these into integrations to make it more modular, and allow for users to tree-shake out the logic if they don't want it (should save decent bundle size on browser).