tests not running when using `import-in-the-middle` with `mocha` about import-in-the-middle HOT 1 OPEN

We wrap all modules in the loader with a wrapper module that allows for modification of exports. We could exclude CJS entrypoints, but that would create an edge case in which they would not be hook-able. In practice, that shouldn't break much, since entrypoints are rarely intentionally hooked, but that would constitute a breaking change if not behind a flag.

For now, you can work around this by wrapping the IITM hook in your own that would look something like this:

// iitm hook that preserves require.main === module

import { load, resolve as iitmResolve } from 'import-in-the-middle/hook.mjs'

async function resolve (specifier, context, parentResolve) {
  if (!context.parentURL) {
    const resolved = await parentResolve(specifier, context)
    if (resolved.format === 'commonjs') {
      return resolved
    }
  }
  return iitmResolve(specifier, context, parentResolve)
}

export { load, resolve }

In a future release, we may exclude CJS entrypoints from wrapping. It might be behind a flag, in order to not break the aforementioned edge case.

from import-in-the-middle.