Export the project as nodejs package for 2nd developing

[HerbertHe]

Is your feature request related to a problem? Please describe.
When I try to write custom entities for Home Assistant, I find that it is really hard for us frontend developer to use yaml file. Then, I found this project. I analyzed the project structure, I thought building the project and publish as a nodejs package is possible.

And I can make it easy to build the custom entities based on button-card by developing a project which can help us to generate
the yaml file automatically. Then we can just write the TypeScript code and CSS to meet the goal, even we can meet WYSIWYG (What You See Is What You Get!!) by using frontend developing tech stack.

Describe the solution you'd like
I think it's really easy to meet the goal

• just need to add a index.ts file at src dir.
• use tsup package which is based on esbuild for building dts and js file
• publish the package to npm

Describe alternatives you've considered
Just exporting the types files is also a good idea.

Additional context
Add any other context or screenshots about the feature request here.