Split domProps into separate subtypes

[dkirchhof]

While building custom jsx transformers or defining bindings for "jsx-libraries" other than react, it could be possible, that some "fields" in domProps has other types as in the core library.

Examples:

• it uses "class" instead of "className"
• style is a string instead of an object
• events are named "click" or "onclick" instead of "onClick"
• ...

So, if you want to add a field, fine. Just extend domProps.
But if you want to change an existing field, you have to create your own type and copy hundreds of existing fields. This is tedious.

---

I splitted the domProps into some subtypes, so it is easier to define your own domProps.
Example:

type customJsxProps = {
  children?: child, // custom type for children
  class?: string, // class instead of className
} 

type customDomProps = {
  ...customJsxProps,
  ...JsxDOM.baseProps,
  ...JsxDOM.events,
  ...JsxDOM.svg,
  style?: string, // string instead of JsxDOMStyle.t
}

---

What do you think?
Is there an easier way?
Does it have performance implications?