netlify dev supports import() but building on Netlify doesn't

Describe the bug

In development, the following code works as expected:

exports.handler = async function (event) {
  const myValue = await import('my-package');
  // ...
};

But when deploying to production, my-package doesn’t get bundled, resulting in 500 errors when the function tries to run (Cannot find package 'my-package' imported from /var/task/my-function.js)

To Reproduce

Steps to reproduce the behavior:

1. Write a Netlify function with a dynamic import
2. Run netlify dev
3. See that the function runs properly
4. Deploy to Netlify
5. See that the deployed function doesn’t run

Expected behavior

Either Netlify’s production function bundling should support this case, or netlify dev should not. The behavior should match between the two.

[mjswensen]

Hi @eduardoboucas , sounds great, I’ll send that over now. Thanks!

[PH4NTOMiki]

Possibly related #1036