Support es6 exports from --entry_point

[KimlikDAO-bot]

Support export statements from the entry point file. This will enable many requested features such as

• import chunking (e.g., Dynamic Import Support)
• dynamic import

while giving the user precise control.

Given a file

// entry.js
import { m1, m2 } from "./mod"
...
...
export { sym1, ..., symN }
export default symDefault;

When compiled with

google-closure-compiler -O ADVANCED --js mod.js entry.js --entry_point entry.js --module_resolution NODE

should output a file containing export { sym1, ..., symN, symDefault as default}.

Currently, this behavior can be achieved by assigning each exported symbol to globalThis in a preprocessing step and then replacing each such assignment in the compiled file to an export statement in a postprocessing step.

[amitdhiman000]

Closure compiler is stripping off the default exports. Facing this problem with emscripten generated ES6 code.
When are we getting this feature ? Or at-least a workaround ?