I tried running npm run check; still got the error. Tried adding the ".svelte-kit/ambient.d.ts" line to the tsconfig; still got the error. Tried both in tandem and still got the error! I had to add an env.d.ts file to make the errors go away. In terms of build errors, I am pretty far from production-ready at this point, but a cursory npm run build didn't show any errors popping back up.