@@toStringTag property not present on modules passed to hookFn

[pichlermarc]

Expected Behavior

Using Hook, the module passed to hookFn includes @@toStringTag property as was the case up until import-in-the-middle@1.7.1

Actual Behavior

Using Hook, the module passed to hookFn does not include the @@toStringTag property.

Steps to Reproduce the Problem

1. npm init
2. npm install --save-exact koa@2.15.0 (used as an example)
3. npm install --save-exact import-in-the-middle@1.7.3
4. create index.mjs

// index.mjs
import Hook from 'import-in-the-middle'
import * as koa from 'koa';

Hook(['koa'], (exported, name, baseDir) => {
  // Expect "Module"
  if(exported[Symbol.toStringTag] !== "Module"){
      throw new Error('Expected module')
  }
})

console.log('Everything as expected');

5. node --loader=import-in-the-middle/hook.mjs index.mjs This fails

However, doing the same with import-in-the-middle@1.7.1 works as expected:

7. npm install --save-exact import-in-the-middle@1.7.1
8. node --loader=import-in-the-middle/hook.mjs index.mjs This succeeds

Additional info

I'm not certain that this is safe, but adding this to the generated code in hook.js after L312 includes the property from the primary namespace and seems to fix the issue.

for (const k of Object.getOwnPropertySymbols(primary)) {
   _[k] = primary[k]
 }

Specifications

• Version: Node.js v18.19.0
• Platform: Ubuntu 22.04