Having a type system wasn't really the goal here (there's enough great tools that handle that), but there's plenty of options that could work for you, if you're willing to build it. Some quick ideas:
1. You could add a jsdoc comment per component, let your tool read it and treat it as the source of truth
2. The template is just a js file, so you could parse it, get the params of the fn and try to deduce the types based on the usage
3. You could use typescript and export types
4. Serialize/normalize data before passing to the templating engine
1. You could add a jsdoc comment per component, let your tool read it and treat it as the source of truth 2. The template is just a js file, so you could parse it, get the params of the fn and try to deduce the types based on the usage 3. You could use typescript and export types 4. Serialize/normalize data before passing to the templating engine