how to configure rollupJs to convert nodeJs script to es6 module? - node.js

Question

I would like to configure one script findFruit.js that is written under nodeJs, wrapping into a library and make it useful from the other project that may be written by nodeJs or es6 code. How should I configure rollup from a es6 module?
I get the error once using
import * as obj from './application'
^^^^^^
SyntaxError: Cannot use import statement outside a module
//~/application/src/findFruit.js
function findFruit() {
return 'banana'
}
module.export = findFruit
//~/application/package.json
{
"name": "get a fruit",
"version": "0.0.0",
"description": "test",
"author": "author",
"license": "UNLICENSED",
"main": "dist/findFruit.js",
"scripts": {
"publish": "rm -rf ./dist && rollup -c rollup.config.js",
},
"devDependencies": {
"#rollup/plugin-commonjs": "^15.0.0",
"rollup": "^2.26.11",
"rollup-plugin-auto-external": "^2.0.0"
}
}
//~/application/rollup.config.js
import commonjs from "#rollup/plugin-commonjs";
import pkg from "./package.json";
import autoExternal from "rollup-plugin-auto-external";
export default {
input: 'src/findFruit.js',
plugins: [autoExternal(), commonjs()],
output: {
file: pkg.main,
format: 'cjs',
exports: 'named',
},
};
//under ~/a.js
import * as obj from './application'
obj(});
//import * as obj from './application'
//^^^^^^
//
//SyntaxError: Cannot use import statement outside a module
//under ~/a.js
const findFruit = require('./application').default;
console.log(findFruit())
//no problem