snippets.js
Since there is no Extensions path in the Emmet settings like in Coda2, I put snippets.js into the Emmet folder (~/Library/Application Support/Nova/Extensions/emmetio.Emmet/) but nothing happened — Emmet doesn't see my snippets. How to add custom snippets/abbreviations?
+1 for this question -- can't see any place to add a snippets.json file, everywhere I've tried seems to be ignored. Not sure if it's a bug or an unimplemented feature?
+1 From me, but should be labeled enhancement. As a workaround you can extend variables in the JS file by simply adding it to the existing ones:
/Users/YOU/Library/Application Support/Nova/Extensions/emmetio.Emmet/Scripts/main.js
But you have to do this after every update.