caml_external_polyfill.ml

(* Copyright (C) 2015-2016 Bloomberg Finance L.P.
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * In addition to the permissions granted to you by the LGPL, you may combine
 * or link a "work that uses the Library" with a publicly distributed version
 * of this file to produce a combined library or application, then distribute
 * that combined work under the terms of your choosing, with no requirement
 * to comply with the obligations normally placed on you by section 4 of the
 * LGPL version 3 (or the corresponding section of a later version of the LGPL
 * should you choose to use a later version).
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *)


type global 
let  getGlobalThis : unit -> global [@bs]= [%raw{| function(){
  if (typeof globalThis !== 'undefined') return globalThis;
	if (typeof self !== 'undefined') return self;
	if (typeof window !== 'undefined') return window;
	if (typeof global !== 'undefined') return global;
	if (typeof this !== 'undefined') return this;
	throw new Error('Unable to locate global `this`');
}|}]

type dyn
let resolve : string -> dyn [@bs] = [%raw {|function(s){
  var myGlobal = getGlobalThis();
  if (myGlobal[s] === undefined){
    throw new Error(s + " not polyfilled by ReScript yet\n")
  }
  return myGlobal[s]
}|}]

(* FIXME: it does not have to global states *)
type fn 


let register : string -> fn -> unit = [%raw{| function(s,fn){
  var myGlobal = getGlobalThis();
  myGlobal[s] = fn 
  return 0
}|}]