title: Rollup with absolute Typescript imports
body: <ul>
  <li>Source: here: <a href="https://github.com/arvigeus/roll-on-slow" rel="nofollow noreferrer">https://github.com/arvigeus/roll-on-slow</a></li>
  <li>Output bundle: <a href="https://github.com/arvigeus/roll-on-slow/tree/master/dist" rel="nofollow noreferrer">dist</a></li>
  <li>Build log: <a href="https://github.com/arvigeus/roll-on-slow/blob/master/build.log" rel="nofollow noreferrer">build.log</a></li>
  </ul>
  <p>Rollup bundles it fine, but it throws some warnings for wrong source maps (<code>Error when using sourcemap for reporting an error: Can't resolve original location of error.</code>). The root of the problem seems to be <code>@babel/preset-react</code> <a href="https://github.com/arvigeus/roll-on-slow/blob/master/babel.config.js#L15" rel="nofollow noreferrer"><code>development: true</code></a> (setting it <code>false</code> makes the warning disappear). Am I doing something wrong, or this is expected behavior? The generated code seems fine to me...</p>
  <p>There is also a warning about <code>'this' has been rewritten to 'undefined'</code>, seems related because it disappears when switching off that option.</p>