diff --git a/files/jsconfig.json b/files/jsconfig.json
new file mode 100644
index 0000000..984906a
--- /dev/null
+++ b/files/jsconfig.json
@@ -0,0 +1,19 @@
+{
+  "extends": "@ember/app-tsconfig",
+  "include": ["app", "tests", "types"],
+  "compilerOptions": {
+    "allowJs": true,
+    "noEmit": true,
+    "paths": {
+      "<%= name %>/tests/*": ["./tests/*"],
+      "<%= name %>/*": ["./app/*"],
+      "*": ["./types/*"]
+    },
+    "types": [
+      "ember-source/types",
+      "@embroider/core/virtual",
+      "vite/client",
+      "@glint/ember-tsc/types"
+    ]
+  }
+}
diff --git a/files/package.json b/files/package.json
index 27034ad..5cab91c 100644
--- a/files/package.json
+++ b/files/package.json
@@ -35,8 +35,8 @@
     "@babel/runtime": "^7.29.2",
     "@babel/plugin-transform-runtime": "^7.29.0<% if (typescript) { %>",
     "@babel/plugin-transform-typescript": "^7.28.6<% } %>",
-    "@babel/eslint-parser": "^7.28.6<% if (typescript) { %>",
-    "@ember/app-tsconfig": "^2.0.0<% } %>",
+    "@babel/eslint-parser": "^7.28.6",
+    "@ember/app-tsconfig": "^2.0.0",
     "@ember/optional-features": "^3.0.0",
     "@ember/string": "^4.0.1",
     "@ember/test-helpers": "^5.4.1",
@@ -49,10 +49,10 @@
     "@embroider/config-meta-loader": "^1.0.0",
     "@embroider/legacy-inspector-support": "^0.1.3",
     "@eslint/js": "^9.39.4",
-    "@glimmer/component": "^2.1.1<% if (typescript) { %>",
+    "@glimmer/component": "^2.1.1",
     "@glint/ember-tsc": "^1.5.0",
     "@glint/template": "^1.7.7",
-    "@glint/tsserver-plugin": "^2.4.0<% } %>",
+    "@glint/tsserver-plugin": "^2.4.0",
     "@rollup/plugin-babel": "^7.0.0<% if (typescript) { %>",
     "@types/qunit": "^2.19.13",
     "@types/rsvp": "^4.0.9<% } %><% if (warpDrive) { %>",
@@ -88,9 +88,9 @@
     "qunit-dom": "^3.5.1",
     "stylelint": "^17.8.0",
     "stylelint-config-standard": "^40.0.0",
-    "testem": "^3.20.0<% if (typescript) { %>",
-    "typescript": "^6.0.3",
-    "typescript-eslint": "^8.58.2<% } %>",
+    "testem": "^3.20.0",
+    "typescript": "^6.0.3",<% if (typescript) { %>
+    "typescript-eslint": "^8.58.2",<% } %>
     "vite": "^8.0.9"
   },
   "engines": {
diff --git a/index.js b/index.js
index dfdac88..0a14547 100644
--- a/index.js
+++ b/index.js
@@ -148,12 +148,15 @@ module.exports = {
         (file) =>
           file !== 'tsconfig.json' &&
           file !== 'app/config/environment.ts' &&
-          !file.startsWith('types/') &&
           !file.endsWith('.d.ts'),
       );
     } else {
       // For TypeScript apps, exclude the JS version of app/config/environment
-      files = files.filter((file) => file !== 'app/config/environment.js');
+      // and the JS-only jsconfig.json.
+      files = files.filter(
+        (file) =>
+          file !== 'app/config/environment.js' && file !== 'jsconfig.json',
+      );
     }
 
     const warpDrive = options.warpDrive || options.emberData;