Simple example: you know how at the command line you can type "npm run", and then type a character or two, hit tab, and the appropriate script from your `package.json` will autocomplete? And if you keep going (eg. "npm run knex") you can do the same thing to autocomplete arguments?

Bun still hasn't figured out how to do that (https://github.com/oven-sh/bun/issues/6037), even though they can all but copy NPM's (already written) completions. I really liked using bun when I played around with it (and it ran my codebase perfectly, without issue) ... but if they can't handle something as simple as Bash completions, they're clearly not ready for the big leagues.