So the linker (i.e. rollup) could be smart about this and notice those commonalities and put them in a common bundle, exporting things using whatever symbols make sense and rewriting the different modules to import the correct symbols from the now common library

Absolutely. This is definitely something I'd like Rollup to be able to do. I haven't really thought about implementation, but this would be a good place to talk about what the API might look like.

rollup.split({
  entries: [ 'foo.js', 'bar.js', 'baz.js' ]
}).then( function ( result ) {
  // code used by all three bundles
  result.common.write({
    dest: 'dist/common.js',
    format: 'umd'
  });

  result.entries.forEach( bundle => {
    bundle.write({
      dest: bundle.entry.replace( 'src', 'dist' ),
      format: 'umd'
    });
  });
});

Total straw man (I'd try and come up with some different examples but it's lunchtime 🍴 🍩), and fairly simplistic (it doesn't allow the level of configurability of JSPM's bundle arithmetic or Webpack's code splitting, though maybe simplicity is more important anyway) – would be very interested to hear other ideas.

Uh oh!

Allow entry to be a glob pattern or an array of strings #120

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