Tree shaking is less than reliable... for it to work well, all the dependencies need to be TS/ESModule imports/exports and even then may not shake out properly.

It helps, but not as much as judicious imports. I've been using Deno more for my personal projects which does have a pretty good @std library, though I do think they should keep methods that simply pass through to the Deno runtime, and should probably support working in Node and Bun as well.