Introducing the `extensions` Folder and the `New Extension` Scaffold

[adrians5j]

Changes

For quite some time, we've had multiple approaches when it comes to locating custom code (plugins/extensions), where sometimes we'd be creating code inside of the apps/{project-application} folder , and sometimes outside of it, within a new yarn workspace, .e.g. packages/myPackage. Our docs contain examples with both approaches being used.

And not only that. Once a piece of code was written, users would still manually have to import it in an entrypoint file, like:

• GraphQL API - apps/api/graphql/src/index.ts (a ~150 LOC file 🫢)
• Admin - apps/admin/src/App.tsx

So, all in all, not only there wasn't a one-and-only approach of doing things / locating the code, but also, having to perform multiple steps in order to bring a plugin/extension to life was simply not ideal DX and error-prone.

With this PR, we are fixing this, by basically introducing the extensions folder in project root, and making it the central place where users will be creating their plugins/extensions. So, this way, users won't have to deal much (if at all) with the apps folder.

[!NOTE] Keeping users outside of the apps folder also helps with improving project upgrades (more stability).

Furthermore, users won't even have to register their plugins in mentioned entrypoint files, because, via the new New Extension scaffold that we're also introducing, this daunting step is automatically done for them.

https://github.com/webiny/webiny-js/assets/5121148/260aa124-a26e-49c8-b5f7-f74bcede4aa2

Other Changes

1. apps/theme -> extensions/theme

One other improvement we did here was moving the apps/theme folder into extensions/theme, so that, again, users have less reasons to go into the apps folder. Which also finally makes the apps folder only contain the actual project applications, which makes 100% sense:

2. Introducing the @webiny/api-serverless-cms Package

With this PR, we've also introduced the @webiny/api-serverless-cms package, which exports the plugin factories users often need while developing on the backend.

The main factories are createContextPlugin and createGraphQLSchemaPlugin, which will be now promoted as the standard way of extending on the backend. The main reason is that these factories automatically have the whole context object defined, so user's don't need to do anything in order to have the full auto complete and type-safety.

How Has This Been Tested?

Manually.

Documentation

Changelog. Docs. Videos.

[adrians5j]

/cypress

[github-actions[bot]]

Cypress E2E tests have been initiated (for more information, click here). :sparkles: