[@rollup/plugin-swc] How to only minify, not transpile: vs rollup-plugin-swc-minify

[sidewayss]

The docs for @rollup/plugin-swc seem to be for TypeScript, and I'm using JavaScript and have no experience with TypeScript. This is my first experience with Node, Rollup, SWC, and packaging in general. I want to run the minification after I transpile with Babel, but Babel's minify makes that impossible because it processes the minification concurrently with the transpilation. I have tried using Terser and no joy there. The rollup-plugin-swc-minify works to my satisfaction in this regard, processing after Babel, but it doesn't allow clients to set minify options, instead it hard codes most all of them. I need to set some of those options.

Here is the example in the @rollup/plugin-swc readme:

import type { Options as SWCOptions } from '@swc/core';

declare type Options = {
  swc?: SWCOptions;
};

But I don't understand how to use that inside my rollup-config.mjs file. How do I specify the SWC options inside the call to swc() in the plugins property? There is no example of that. I have tried a couple of things but always end up with default settings: transpilation and no minification. And a question that probably belongs elsewhere: How do I tell SWC not to transpile and only to minify? I can see how rollup-plugin-swc-minify does it, but that's inside a Rollup plugin using SWC API, not a Rollup config file using Options.

I could fork or copy rollup-plugin-swc-minify to hard code my options, or publish a plugin that lets users specify all the options, but I'd much rather use a plugin that's part of Rollup itself and properly supported.