cleaned up the warning. you should be able to build cleanly now. as for the mdast issue, those were new packages i added yesterday for markdown parsing. you can build them by running the bootstrap sequence again

npx lerna bootstrap --scope @dendronhq/common-all  --scope @dendronhq/common-server --scope @dendronhq/engine-server --scope @dendronhq/plugin-core --scope @dendronhq/dendron-cli

and you're right about the parallel runner swallowing errors. going to look into adding a husky hook to catch warnings before committing. will also be updating the dev docs based on your comments