Bundling Node.js module with bare return on top level, c.f. https://twitter.com/liran_tal/status/1245626369112821763

index.js

import semver from 'semver'                 // I want this to be bundled in
import './node_modules/abc/abc.js'          // this is vanilla JS, I expect this to be imported in the global scope
import * as myData from './mydata.json'     // this is just json data I'm working with
 
async function myOwnThing() {
  return some_data_object_here;
}
 
return myOwnThing();

mydata.json

{}

package.json

{
  "name": "gist",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "dependencies": {
    "esm": "3.2.25",
    "rollup": "2.3.2",
    "rollup-plugin-terser": "5.3.0",
    "semver": "7.1.3"
  }
}

rollup.config.js

import { terser } from "rollup-plugin-terser";

const options = {
  parse: {
   bare_returns: true
  }
};

module.exports = {
  input: "index.js",
  plugins: [terser(options)]
};

Basically, It should be possible to bundle index.js into a node module, but the return myOwnThing(); trips up many bundlers.
Running terser -p 'bare_returns' index.js creates a minified file, but the file is never passed into the rollup plugin for terser.