Dual Package Hazard

[nicholasio]

Describe the bug

Currently, HeadstartWP ships both a CJS export and an ESM export. This allows modern consumers to include less code and to support ESM ecosystem.

However, we're currently suffering from "Dual Package Hazard" which means there might be instances of "instance of" check that simply do not work well. For instance isBlockByName might always return false given the instanceof check regardless of the matching node.

This is not the first symptom of this issue - we've also had issues where the SWRConfig cache wasn't working at all which has been fixed but other issues like this will likely keep happening.

This issue is to explore our options and how to address this issue for real.

See https://nodejs.org/api/packages.html#dual-package-hazard for more info.

Steps to Reproduce

See https://github.com/GeoffreyBooth/dual-package-hazard#dual-package-hazard

Screenshots, screen recording, code snippet

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