They are documented here, though perhaps not prominently enough:
(I’m not sure DFX_MOC_PATH, and more generally, DFX_TOOL_PATH is, however).
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In the build artifact directory .dfx/local/canisters/<project_name>, we store both .old.most and .most files, you can be look at those files for debugging.
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sorry for the wrong wording, i actually meant the environment variables
Np. I opened an issue on the sdk repo to suggest it.
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