I'm using a loader package to which I pass the name of a loadee module and it require()s it.

The loader uses CJS's require() to dynamically require the loadee, but the loadee is an ES module. Because of this Node.js throws an error.

Error [ERR_REQUIRE_ESM]: require() of ES Module LOADEE from LOADER not supported.
Instead change the require of LOADEE in LOADER to a dynamic import() which is available in all CommonJS modules.

Neither the loader or the loadee are managed by me, so I can't modify them. I can't avoid using them either.

I can of course write an intermediary loadee, written in CJS (so the loader can load it), which then loads the true loadee and passes it back to the loader. But I don't know how to do it, since the dynamic import() is async (returns a promise), but the loader's require() is sync and expects the loaded module immediately.

Is there anything else I can do to make this thing work?

Example to show what's happening

In case the description I gave is not clear enough, I'm trying to post some minimal snippets of code to show what's happening:

LOADER (CJS; not written by me)

module.exports = function(pkg) {
  const x = require(pkg)
  console.log(x)
}

LOADEE (ES Module; not written by me)

default export const x = 1

./index.js (this one is mine: I can choose CJS or ES Module or anything else)

import load from 'LOADER'
load('LOADEE')

When I run node ./index.js this is what I get:

Error [ERR_REQUIRE_ESM]: require() of ES Module LOADEE from LOADER not supported.
Instead change the require of LOADEE in LOADER to a dynamic import() which is available in all CommonJS modules.

Similar questions

I already found similar questions on stack overflow. For instance:

• Error: require() of ES modules is not supported when importing node-fetch

• Error [ERR_REQUIRE_ESM]: require() of ES Module not supported

They explain how to use import() to dynamically import a module. But that doesn't help me since I cannot change the require() call in the loader and don't know how to wrap it with an async dynamic import().

Is there anything I can do to make this thing work?