custom-elements-manifest VS custom-elements-manifest

You can read more about @custom-elements-manifest/analyzers rich plugin system here: Plugin Authoring Handbook, and be sure to check out the cem-plugin-template repository.

To get started developing custom plugins, take a look at the cem-plugin-template repository to quickly get you up and running, and take a look at the Authoring Plugins documentation for more in depth information.

If you want to promote portability, then blocks should be web components based, full stop. React-based blocks won't be usable without setting up React on the page.

I think the FAQ around leaves a lot more open questions. Like:

> but they do not standardize the interface between those blocks and the applications using them

I'm not sure this is entirely true. Most reusable components these will have an interface described by a type system - this is how IDEs offer code completion and JSX and other template systems are type-checked.

In the Web Components Community Group we're also standardizing a format for describing the entire interface of a web component, including its attributes, properties, events, methods, CSS variables and parts, etc. This is called the Custom Element Manifest: https://github.com/webcomponents/custom-elements-manifest

Instead of being tied to json-ld, the manifest just documents what JS/TS type a property, etc., has. If a component has a person property that accepts a Person type, a tool can understand that.

This manifest will give tools like catalogs, linters, and visual UI builders enough information to do high-level operations like generate demos, lint templates, assemble components without code, etc.

The Web Components Community Group is developing such a format to describe the types of components here: https://github.com/webcomponents/custom-elements-manifest

People have already built tools that generate wrappers based on it.

TL;DR: A Custom Elements Manifest is a JSON file that contains all metadata about the custom elements in your project. You can read all about it here.

Custom Elements Manifest is a file format that describes the custom elements in your project. This format will allow tooling and IDEs to give rich information about the custom elements in a given project. A custom-elements.json contains metadata about the custom elements in your project; their properties, methods, attributes, inheritance, slots, CSS Shadow Parts, CSS custom properties, and a modules exports. If you're interested in following the specification of the schema, or contributing to it, you can find the repository here: webcomponents/custom-elements-manifest.