To repro:

1. Run npm i to install dependencies
2. Run npm run build to bundle the code
3. Look at out/test/two.js

Expected:

import { one } from './one.js';

function two() {
    one();
    console.log('two');
}

export { two };

Actual:

function one() {
    console.log('one');
}

function two() {
    one();
    console.log('two');
}

export { two };

Note: Removing rollup-plugin-typescript2 from the plugins array eliminates the repro.