__esm() initialisation never called with export * from statement.

[EHadoux]

Hey, do you have any idea of why an import of an ESM lib can turn into a var init_somthg = __esm() import, with init_somthg() that is never called anywhere?

So, my smallest example for now:

import { PDF, getToc } from 'documents';

(async () => {
  const file = 'myfile.pdf';
  const pdf = new PDF(file);
  await getToc(pdf);
})();

PDF is a class and getToc is a function.

The problematic part is once bundled with esbuild --bundle --target=node14 --platform=node --loader:.ts=ts:

// ../documents/dist/fuzzy/index.js (It's an external lib but in an NPM workspace, hence the ../documents)
var init_fuzzy2 = __esm({
  "../documents/dist/fuzzy/index.js"() {
    init_toc();
  }
});

The documents lib in itself is build with tsc with target=ES2020 and module=ES2020, with type: module and sideEffects: false in package.json.

It's fuzzy2 because getToc uses a library that itself has fuzzy in its path. I've tried changing the directory name, it's reflected in the generated code (e.g. init_fuzzyy) but it still doesn't get called.
The thing is that init_fuzzy (the import of that library) is being called, but not init_fuzzy2, so I end up with a bunch of uninitialised things. getToc uses top-level variables that are defined in the file where it's defined, but that are not exported (which shouldn't make a difference because they get defined in the body of init_fuzzy2, but because it is not called, these variables are not initialised).
However, if I manually add init_fuzzy2(); somewhere in the bundled output, it works.
I'll post more info if you need, but I got to redact a lot of it. Cheers!

[EHadoux]

Interestingly, if I import everything like that instead:

import { PDF } from 'documents/dist/PDF/pdf';
import { getToc } from 'documents/dist/fuzzy/toc';

(async () => {
  const file = 'myfile.pdf';
  const pdf = new PDF(file);
  await getToc(pdf);
})();

There is no __esm() anymore, everything is just moved to the top-level (the variables as well) and it just works.

EDIT: I think I found it. Here is my hierarchy for the documents lib:

src
|- fuzzy 
|--- index.ts
|--- toc.ts
|- PDF
|--- index.ts
|--- pdf.ts
|- index.ts

Everything is exported explicitly in src/fuzzy/index.ts and src/PDF/index.ts (i.e. export { getToc } from './toc.ts') but I had a star export in src/index.ts (i.e. export * from './fuzzy').
By changing it to an explicit export (export { getToc } from './fuzzy'), the same code is generated, but init_fuzzy2 is called this time and everything works.