Can I pre-cache dependencies that I specify using npm:?

Hi! Trying to figure out the right way to combine Deno's module support to make our deploys consistent. In particular, I was using esm.shesm.sh URLs, but just hit some CDN errors so that made me switch to npm:npm: in hopes of it being more reliable. But afaict deno vendordeno vendor doesn't vendor npm dependencies? What's the right combination of things to do to deploy reliably?