reasonml external

/* from https://github.com/reasonml/reason-react/blob/master/src/reactDOMRe.re */ 

/* First time reading an OCaml/Reason/BuckleScript file? */
/* `external` is the foreign function call in OCaml. */

/* here we're saying `I guarantee that on the JS side, we have a `render` function in the module "react-dom"
   that takes in a reactElement, a dom element, and returns unit (nothing) */

/* It's like `let`, except you're pointing the implementation to the JS side. The compiler will inline these
   calls and add the appropriate `require("react-dom")` in the file calling this `render` */

external render : ReactRe.reactElement => Dom.element => unit =
  "render" [@@bs.val] [@@bs.module "react-dom"];