Emit types instead of classes for JavaScript

CHANGELOG.md

@@ -6,6 +6,8 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/)
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased]
+### Changed
+- [JavaScript] BREAKING CHANGE: Emit types instead of classes ([#287](https://github.com/cucumber/messages/pull/287))
 
 ### Fixed
 - [python] Add a LICENSE file for Python ([#278](https://github.com/cucumber/messages/pull/278))

codegen/templates/typescript.ts.erb

@@ -1,16 +1,8 @@
-import { Type } from 'class-transformer'
-import 'reflect-metadata'
-
 <% @schemas.each do |key, schema| -%>
-export class <%= class_name(key) -%> {
+export type <%= class_name(key) -%> = {
   <%- schema['properties'].each do |property_name, property| -%>
-
-    <%- ref = property['$ref'] || property['items'] && property['items']['$ref'] -%>
-    <%- if ref -%>
-      <%- %>  @Type(() => <%= class_name(ref) -%>)
-    <%- end -%>
     <%- if (schema['required'] || []).index(property_name) -%>
-      <%- %>  <%= property_name %>: <%= type_for(class_name(key), property_name, property) -%> = <%= default_value(class_name(key), property_name, property) -%>
+      <%- %>  <%= property_name %>: <%= type_for(class_name(key), property_name, property) -%>
     <%- else -%>
       <%- %>  <%= property_name %>?: <%= type_for(class_name(key), property_name, property) -%>
     <%- end -%>

javascript/package.json

@@ -36,14 +36,12 @@
     "prepublishOnly": "npm run build && npm run copy-schemas"
   },
   "dependencies": {
-    "@types/uuid": "10.0.0",
-    "class-transformer": "0.5.1",
-    "reflect-metadata": "0.2.2",
     "uuid": "11.0.5"
   },
   "devDependencies": {
     "@types/mocha": "10.0.10",
     "@types/node": "22.13.1",
+    "@types/uuid": "10.0.0",
     "copyfiles": "2.4.1",
     "mocha": "11.1.0",
     "shx": "^0.3.4",