Modules marked as external not appearing in metafile outputs imports

[tinovyatkin]

Hello,

Shouldn't modules market as external appear in imports array in the metafile outputs? They are still imported, so, it's logical to expect them to be listed in this field.

Possible workaround with collecting such modules names via small plugin unfortunately doesn't works with sync bundling call (and I'm using esbuild in CDK where I need a sync call).

Right now, as a workaround, we are re-parsing output files just to get remained modules imports and that's not a good for performance.