Support for ESM modules

[loklaan]

Hey folks!

It looks like some commonly used packages (read: Sindres Sorhus's pkgs) are recently making the switch to ESM-only exports, and at the moment they won't work with the keystone cli, since under the hood isn't setup for that.

I'd wager the Keystone team have a plan here, since the forward-incompatibility is a big looming issue for most kinds of JS project, but I'd like put a bookmark on the topic here!

I've been tracking similar discussions across:

• Gatsby
• NextJS

---

This was a question I asked originally in Slack, but afterwards I thought it would be nice to track this discussion in Github. Thanks again @raveling for the quick response there! 👋

Unfortunately this isn't currently possible. Next.js has experimental support for Node ESM, but it's not ready for prime time yet. We may be able to provide a better story for this use case after it's production ready. Hope this helps!
- raveling

[raveling]

@loklaan we will support this eventually. Hope this helps 🙂

[wingedrhino]

Is there a rough ETA on when keystonejs can support ESM? I am evaluating it for a new project and I have a few months before it hits production. Some of my dependencies are ESM-only.

[mmachatschek]

@dcousens could we get the current on this topic?

What would it take to make keystone compatible for both ESM and CJS?

[mmachatschek]

One blocker is the current implementation of the config generator that builds .keystone/config.js in CJS format (which doesn't allow ESM only imports of packages like lodash-es, @sindresorhus/slugify)

[dcousens]

@mmachatschek in effect, if we can work on making the CI pass for #8820 - we'll be some of the way there

[learnwithus]

Very much looking forward to ESM support. I have a few dependencies that I'm unable to upgrade because they've gone ESM only.

[unrevised6419]

From my understanding, the status of ESM for KS is a bit tricky now in its current state.

Also, this repo uses preconstruct

preconstruct/preconstruct#513 (comment)
preconstruct/preconstruct#471