Guidance on star exports from entrypoint.js

[icereval]

Is your feature request related to a problem? Please describe.
Unable to load the handler function from entrypoint.js in AWS Lambda.

Describe the solution you'd like
When loading the bundle.zip into AWS Lambda and referencing its handler function via bundle/entrypoint.js, it would be ideal if the entrypoint.js was re-exporting module functions.

Describe alternatives you've considered
Leveraging typescript, we can convert a simple export within the existing project, and thus copy its transpiled __exportStar polyfill to a custom app.js (nearly equivalent to entrypoint.js).

https://github.com/ojkelly/yarn.build/blob/trunk/packages/plugins/plugin-build/src/commands/bundle/index.ts#L274-L284

app.js

'use strict';
require('./.pnp.js').setup();
var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
  if (k2 === undefined) k2 = k;
  Object.defineProperty(o, k2, { enumerable: true, get: function() { return m[k]; } });
}) : (function(o, m, k, k2) {
  if (k2 === undefined) k2 = k;
  o[k2] = m[k];
}));
var __exportStar = (this && this.__exportStar) || function(m, exports) {
  for (var p in m) if (p !== 'default' && !Object.prototype.hasOwnProperty.call(exports, p)) __createBinding(exports, m, p);
};
Object.defineProperty(exports, '__esModule', { value: true });
__exportStar(require(`./packages/${process.env.PACKAGE_NAME}/dist/index.js`), exports);

Additional context
This would depend on the project's tsconfig.json target polyfills, and would likely be best to perform this step in the yarn bundle command itself, with a call to tsc and an entrypoint.ts file.

[ojkelly]

Are we able to do this in a way that's generic to any js file?

If so, then this sounds great.

[jacobwgillespie]

Out of curiosity, does something like this work?

"use strict";

const pnp = require("${pnp}").setup();

module.exports = require("./${main}");

That would effectively set the current module's exports equal to all the exports of the main script - assuming that the main script itself set __esModule, I believe this means that entrypoint.js would as well? So perhaps this would just work? I don't think you necessarily need to set entrypoint.js as built ESM with dynamic bindings, I think you just need to proxy everything over to the built main file.

I may be missing something here though.