Calling webpacked code from outside (HTML script tag)

It seems that you want to expose the webpack bundle as a library. You can configure webpack to expose your library in the global context within a variable of your own, like EntryPoint.

I don’t know TypeScript so the example uses plain JavaScript instead. But the important piece here is the webpack configuration file, and specifically the output section:

webpack.config.js

module.exports = {
  entry: './index.js',
  output: {
    path: './lib',
    filename: 'yourlib.js',
    libraryTarget: 'var',
    library: 'EntryPoint'
  }
};

index.js

module.exports = {
  run: function () {
    console.log('run from library');
  }
};

Then you will be able to access your library methods like you expect:

<script src="https://stackoverflow.com/questions/34357489/lib/yourlib.js"></script>
<script>
  window.onload = function () {
    EntryPoint.run();
  };
</script>

Check the gist with the actual code.