Update JS reserved keywords list, clean up scripts, add documentation (#6167)

* Sort existing keyword list

* Regenerate (sorted) keyword list

* Update scripts and rebuild js_reserved_map

* Update CONTRIBUTING.md

* Rebuild libs

* Update CHANGELOG

Author: cknitt

CHANGELOG.md

@@ -23,6 +23,9 @@
 - Fixed subtype checking for record types with "@as" attributes: The subtype relationship now takes into account the compatibility of "@as" attributes between corresponding fields, ensuring correctness in runtime representation.
  https://github.com/rescript-lang/rescript-compiler/issues/6158
 
+#### :nail_care: Polish
+
+- Update list of reserved JS keywords. https://github.com/rescript-lang/rescript-compiler/pull/6167
 
 # 11.0.0-alpha.3
 

CONTRIBUTING.md

@@ -330,6 +330,17 @@ To generate the html:
 ../scripts/ninja docs
 ```
 
+## Update JS Reserved Keywords Map
+
+The compiler sources include a list of reserved JS keywords in `jscomp/ext/js_reserved_map.ml` which includes all identifiers in global scope (`window`). This list should be updated from time to time for newer browser versions.
+
+To update it, run:
+
+```sh
+npm install puppeteer
+node scripts/build_reserved.js
+```
+
 ## Code structure
 
 The highlevel architecture is illustrated as below: