Add Js.globalThis object binding (rescript-lang#6909)

Author: cometkim

CHANGELOG.md

@@ -23,6 +23,7 @@
 - Allow `private` in with constraints. https://github.com/rescript-lang/rescript-compiler/pull/6843
 - Add regex literals as syntax sugar for `@bs.re`. https://github.com/rescript-lang/rescript-compiler/pull/6776
 - Improved mechanism to determine arity of externals, which is consistent however the type is written. https://github.com/rescript-lang/rescript-compiler/pull/6874 https://github.com/rescript-lang/rescript-compiler/pull/6881 https://github.com/rescript-lang/rescript-compiler/pull/6883
+- Add `Js.globalThis` object binding. https://github.com/rescript-lang/rescript-compiler/pull/6909
 
 #### :boom: Breaking Change
 

jscomp/others/js.res

@@ -77,6 +77,9 @@ Prefer `Js.Array2` over `Js.Array`, `Js.String2` over `Js.String`, etc. The latt
 /** JS object type */
 type t<'a> = {..} as 'a
 
+/** JS global object reference */
+@val external globalThis: t<'a> = "globalThis"
+
 /**
   Nullable value of this type can be either null or 'a. This type is equivalent to Js.Null.t.
 */

jscomp/runtime/js.res

@@ -77,6 +77,9 @@ Prefer `Js.Array2` over `Js.Array`, `Js.String2` over `Js.String`, etc. The latt
 /** JS object type */
 type t<'a> = {..} as 'a
 
+/** JS global object reference */
+@val external globalThis: t<'a> = "globalThis"
+
 /**
   Nullable value of this type can be either null or 'a. This type is equivalent to Js.Null.t.
 */