Changes!

Author: lpil

CHANGELOG.md

@@ -20,10 +20,14 @@
 
   ([Adi Salimgereyev](https://github.com/abs0luty))
 
-- The JavaScript prelude JavaScript API now contains the `BitArray$isBitArray`
+- The JavaScript prelude TypeScript API now contains the `BitArray$isBitArray`
   and `BitArray$BitArray$data` functions.
   ([Louis Pilfold](https://github.com/lpil))
 
+- The type-checking JavaScript functions for Gleam data structure now use the
+  `value is TypeName` TypeScript return type rather than `boolean`.
+  ([Louis Pilfold](https://github.com/lpil))
+
 ### Build tool
 
 - When adding a package that does not exist on Hex, the message is a bit