WIP adapting to sync resolve; cleaning up esm hook stuff

[cspotcode]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 88.88889% with 2 lines in your changes missing coverage. Please review.

Project coverage is 79.77%. Comparing base (bf13086) to head (83ebb8a).
Report is 49 commits behind head on main.

Files with missing lines	Patch %	Lines
src/esm.ts	85.71%	1 Missing and 1 partial ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
src/child/child-loader.ts	88.88% <100.00%> (ø)
src/esm.ts	84.37% <85.71%> (+1.04%)	⬆️

[cspotcode]

node rolled back the sync resolve change, so I can extract the ESM cleanup stuff from this PR but drop all the sync resolve stuff.