[flow] add configurability to data prop values

Summary: Changelog: [internal]

Reviewed By: gkz

Differential Revision: D69404375

fbshipit-source-id: 89b2e591b0ee2fb6dcba9c0fe64477557bbd0093

Author: jbrown215

lib/react-dom.js

@@ -862,6 +862,9 @@ type ReactDOM$HTMLElementProps = {|
 // Override this if you want to add custom props to all HTML elements
 type ReactDOM$CustomHTMLElementProps = $ReadOnly<{||}>;
 
+// Override this if you want to change the types accepted by data-prefixed props
+type ReactDOM$DataPropValues = ?(string | boolean | number);
+
 // Self closing tags, like br, do not allow children
 type ReactDOM$SelfClosingHTMLElementProps = Omit<
   ReactDOM$HTMLElementProps,
@@ -874,7 +877,7 @@ type ReactDOM$HTMLElementJSXIntrinsicTyped<Props, Instance = HTMLElement> = {|
     ...Props,
     ...ReactDOM$EventHandlers<Instance>,
     // We add data props here to avoid spreading errors
-    [StringPrefix<'data-'>]: ?(string | boolean | number),
+    [StringPrefix<'data-'>]: ReactDOM$DataPropValues,
   },
 |};