Fix: #4695 Reference CommonJS child bundles with a require call

[jfrconley]

↪️ Pull Request

This pull request adds support to JSRuntime for referencing CommonJS child bundles with a require call. No handling of this was present, so the current behavior was to use a URL reference.

Resolves: #4695

💻 Examples

There isn't an easy way to see this in action without a custom bundler. I created a simple one (https://github.com/jfrconley/parcel-bundler-splitable) that allows listing files you want to split the bundle on. The integration test relies on a custom bundler with a hardcoded path to split on.

🚨 Test instructions

Testing is covered by added integration test: commonjs-bundle-require

✔️ PR Todo

• Added/updated unit tests for this change
• Filled out test instructions (In case there aren't any unit tests)
• Included links to related issues/PRs

[jfrconley]

@mischnic Is there a timeline for when this can be merged? Keeping a custom runtime plugin up to date is causing some issues for us.

[mischnic]

I'll take a look.
Could you slim down the bundler plugin you added in the test so that it only includes the bare minimum to make the test work? For example the optimize step likely doesn't do anything here

[jfrconley]

I removed optimize and deduplicate. Additionally, I've resolved merge conflicts and pulled in upstream changes

[jfrconley]

@mischnic Is there any other cleanup I need to do before this can be merged?

[mischnic]

I would have suggested supporting ESM as well while we're at it, but that can't work yet for other reasons...