fix: Properly configure SDK to be distributed as ESM

[frederikprijck]

After merging #2028 and then reverting it again in #2046 , we are introducing the exact same changes again to fix our ESM bundling.

After merging #2028, it was called out to break a certain situation, so we immediately reverted again.
However, after some more investigation, we noticed that:

• The broken behavior is only in local development mode when using turbopack
• The broken behavior is only occuring when not following our guidance to require passing the request object to getSession() when used in middleware.

As this only breaks in local development, when using turbopack, and only when not passing down request to getSession in middleware (which is clearly called out in our docs not to do), we have decided to release this as a fix for #1945 and not consider this a breaking change.

Closes #1945

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 62.50000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 82.66%. Comparing base (622aec0) to head (9e46dfa).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/client/helpers/get-access-token.ts	0.00%	0 Missing and 1 partial ⚠️
src/client/index.ts	0.00%	0 Missing and 1 partial ⚠️
src/server/index.ts	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2171   +/-   ##
=======================================
  Coverage   82.66%   82.66%           
=======================================
  Files          21       21           
  Lines        2060     2060           
  Branches      362      362           
=======================================
  Hits         1703     1703           
  Misses        350      350           
  Partials        7        7           

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[tomer-dev]

Thank you!

[miriarte33]

Thanks @frederikprijck ! So, to clarify, after this fix is in, we will have to pass the request in to the getSession call in the middleware?

[frederikprijck]

@miriarte33 Even before this fix, you should. Not passing it in is not supported (we call it out here), but it will work in some cases.

If you are not passing request to getSession, it will not work after this PR locally when using --turbopack, but build + start still works fine.

But again, not passing request in the middleware is not a scenario we support, even tho it may or may not work in certain scenario's.

For clarity, I have reached out to the folks at vercel to talk about this, because I think this is an issue with turbopack.

[miriarte33]

Makes perfect sense, thanks