export EnvelopedEvent interface

[martin-cycle]

Summary

Fix issue #1334

Requirements (place an x in each [ ])

• I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.

[CLAassistant]

All committers have signed the CLA.

[filmaj]

LGTM! Thanks for submitting the PR. Will merge after the tests finish running in CI.

[codecov]

Codecov Report

Merging #1340 (9384390) into main (ab5954f) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1340   +/-   ##
=======================================
  Coverage   72.76%   72.76%           
=======================================
  Files          17       17           
  Lines        1465     1465           
  Branches      436      436           
=======================================
  Hits         1066     1066           
  Misses        310      310           
  Partials       89       89           

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