I started this extension a few weeks ago while I was working on my dissertation proposal. As my document grew, I thought the existing plugin [1] was not able to send the entire document to AfterTheDeadline. I also ran into issues where I didn't have Internet access, but still needed my document checked. I decided to write my own plugin to fit my needs. It's still in the early development stages, but after the discussion [2] today on the original plugin, I thought I'd release my attempt. Let me know what you think!
[1] https://github.com/Microsoft/vscode-spell-check
[2] https://news.ycombinator.com/item?id=11804366
Edit: formatting