I'm curious to see the output. Most of the time I specifically avoid using the SDK published by the API provider because it's thousands of lines of code when all I need is ten lines wrapping fetch.
We try to keep it to a minimum, especially in JS (though we have some nice improvements coming soon when we deprecate node-fetch in favor of built-in fetch). The package sizes aren't tiny because we include thorough types and sourcemaps, but the bundle sizes are fairly tidy.
Here's an example of a typical RESTful endpoint (Lithic's `client.cards.create()`:
