Fix lack of source maps in ESM output

[flevi29]

Pull Request

Related issue

Fixes #1834

PR checklist

Please check if your PR fulfills the following requirements:

• Does this PR fix an existing issue, or have you listed the changes applied in the PR description (and why they are needed)?
• Have you read the contributing guidelines?
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.21%. Comparing base (def691d) to head (b5aff48).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1837   +/-   ##
=======================================
  Coverage   98.21%   98.21%           
=======================================
  Files          17       17           
  Lines        1565     1565           
  Branches      333      333           
=======================================
  Hits         1537     1537           
  Misses         28       28           

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