Which package is this a feature request for?

React (@lit-labs/react)

Description

An explicit helper type for devs to use in JSXIntrinicElements would reduce type conflicts for react clients.

declare namespace JSX {
  interface IntrinsicElements {
    foo: HelperType<CustomElement>;
  }
}

Currently we rely on Typescript to infer what is returned from createComponent and although TS is fairly good, an inference is not as durable as an explicit typing.

Related to: #3163

Alternatives and Workarounds

There are a few caveats to keep in mind:

• our package returns a ForwardedRef as a component
• web components not created through createComponent still need proper typing, they are not a ForardRef

Two types should be exported:

1. type returned from createComponent
2. a type any dev can use for IntrinsicElements