Add export of Result type

Closes GH-18.

index.js

@@ -1,6 +1,7 @@
 /**
  * @typedef {import('./lib/index.js').Child} Child
  * @typedef {import('./lib/index.js').Properties} Properties
+ * @typedef {import('./lib/index.js').Result} Result
  */
 
 export {h, s} from './lib/index.js'

lib/index.js

@@ -1,6 +1,7 @@
 /**
  * @typedef {import('./core.js').HChild} Child
  * @typedef {import('./core.js').HProperties} Properties
+ * @typedef {import('./core.js').HResult} Result
  */
 
 export {h} from './html.js'

readme.md

@@ -254,7 +254,11 @@ different files.
 ## Types
 
 This package is fully typed with [TypeScript][].
-It exports the additional types `Child` and `Properties`.
+It exports the additional types:
+
+*   `Child` — valid value used as a child
+*   `Properties` — valid properties passed to an element
+*   `Result` — output of a `h` (or `s`) call
 
 ## Compatibility