Use addon-dev declarations plugin for d.ts output

files/__addonLocation__/package.json

@@ -13,22 +13,16 @@
     "declarations",
     "dist"
   ],
-  "scripts": {<% if (typescript) { %>
-    "build": "concurrently \"<%= packageManager %>:build:*\"",
-    "build:js": "rollup --config",
-    "build:types": "glint --declaration",<% } else { %>
-    "build": "rollup --config",<% } %>
+  "scripts": {
+    "build": "rollup --config",
     "lint": "concurrently \"<%= packageManager %>:lint:*(!fix)\" --names \"lint:\"",
     "lint:fix": "concurrently \"<%= packageManager %>:lint:*:fix\" --names \"fix:\"",
     "lint:hbs": "ember-template-lint . --no-error-on-unmatched-pattern",
     "lint:js": "eslint . --cache",
     "lint:hbs:fix": "ember-template-lint . --fix --no-error-on-unmatched-pattern",
     "lint:js:fix": "eslint . --fix",<% if (typescript) { %>
-    "lint:types": "glint",
-    "start": "concurrently \"<%= packageManager %>:start:*\"",
-    "start:js": "rollup --config --watch --no-watch.clearScreen",
-    "start:types": "glint --declaration --watch",<% } else { %>
-    "start": "rollup --config --watch",<% } %>
+    "lint:types": "glint",<% } %>
+    "start": "rollup --config --watch",
     "test": "echo 'A v2 addon does not have tests, run tests in test-app'",
     "prepack": <% if (typescript) { %>"concurrently '<%= packageManager %>:build:*'"<% } else { %>"rollup --config"<% } %>
   },

files/__addonLocation__/rollup.config.mjs

@@ -52,7 +52,10 @@ export default {
     addon.hbs(),
 
     // Ensure that .gjs files are properly integrated as Javascript
-    addon.gjs(),
+    addon.gjs(),<% if (typescript) { %>
+
+    // Emit .d.ts declaration files
+    addon.declarations('declarations'),<% } %>
 
     // addons are allowed to contain imports of .css files, which we want rollup
     // to leave alone and keep in the published output.