Output Target: Custom Elements Manifest

[fgeierst]

Having custom-elements.json as a StencilJS output target would enable a lot of tooling, for example the language server, storybook argTypes generation and the custom elements validator CLI.

There is an existing issue, #2048 which was closed when https://github.com/stencil-community/stencil-web-types arrived (which is JetBrains specific and not the same as Custom Elements Manifest).

Currently, you can use the @custom-elements-manifest/analyzer CLI to generate a Custom Elements Manifest for Stencil — but I still think this should be a official stencil output target.

[fgeierst]

It is a bit confusing that in the current docs for @stencil/storybook-plugin, the file name for output target docs-json is called custom-elements.json. One might understand, this file follows the custom elements manifeset schema, but this is not the case. The file should rather be called docs-json.json in the docs.