diff --git a/build/rolldown.config.mjs b/build/rolldown.config.mjs
index d2b5cf7bf4..13bef8712e 100644
--- a/build/rolldown.config.mjs
+++ b/build/rolldown.config.mjs
@@ -40,7 +40,7 @@ if (BUNDLE) {
 }
 
 const rolldownConfig = {
-  input: path.resolve(__dirname, `../js/index.${ESM ? 'esm' : 'umd'}.js`),
+  input: path.resolve(__dirname, `../js/index.${ESM ? 'esm' : 'umd'}.ts`),
   // oxc strips the types and lowers the syntax, so the dist path carries no
   // Babel. The targets come from .browserslistrc, the same source Babel read.
   transform: {
diff --git a/build/tsconfig.entries.json b/build/tsconfig.entries.json
new file mode 100644
index 0000000000..5933d244e8
--- /dev/null
+++ b/build/tsconfig.entries.json
@@ -0,0 +1,14 @@
+{
+  "extends": "../tsconfig.json",
+  "compilerOptions": {
+    // The bundle entries are rolldown inputs, not part of the published type
+    // surface (build/tsconfig.dts.json emits from js/src only), so the per-file
+    // declaration constraints that keep js/src emittable do not apply here. The
+    // UMD entry cannot satisfy them anyway: a default-exported object of
+    // component classes is not inferable under isolatedDeclarations, and the
+    // explicit-value workaround collides with object-shorthand.
+    "declaration": false,
+    "isolatedDeclarations": false
+  },
+  "include": ["../js/index.esm.ts", "../js/index.umd.ts"]
+}
diff --git a/eslint.config.mjs b/eslint.config.mjs
index 2bce470c4f..c6eebfc191 100644
--- a/eslint.config.mjs
+++ b/eslint.config.mjs
@@ -149,7 +149,7 @@ export default [
   {
     // The library sources are migrating to TypeScript file by file, so this
     // block only applies where a `.ts` file already exists.
-    files: ['js/src/**/*.ts', 'js/tests/vitest.config.mts'],
+    files: ['js/index.esm.ts', 'js/index.umd.ts', 'js/src/**/*.ts', 'js/tests/vitest.config.mts'],
     languageOptions: {
       parser: tseslint.parser,
       sourceType: 'module'
diff --git a/js/index.esm.js b/js/index.esm.ts
similarity index 90%
rename from js/index.esm.js
rename to js/index.esm.ts
index 76e194b509..d0628af55f 100644
--- a/js/index.esm.js
+++ b/js/index.esm.ts
@@ -1,6 +1,6 @@
 /**
  * --------------------------------------------------------------------------
- * CoreUI PRO index.esm.js
+ * CoreUI PRO index.esm.ts
  * Licensed under MIT (https://coreui.io/pro/license/)
  * --------------------------------------------------------------------------
  */
diff --git a/js/index.umd.js b/js/index.umd.ts
similarity index 95%
rename from js/index.umd.js
rename to js/index.umd.ts
index 89c1368bc9..fbaf30d4ab 100644
--- a/js/index.umd.js
+++ b/js/index.umd.ts
@@ -1,7 +1,7 @@
 /**
  * --------------------------------------------------------------------------
- * CoreUI PRO index.esm.js
- * Licensed under MIT (Licensed under MIT (https://coreui.io/pro/license/)
+ * CoreUI PRO index.umd.ts
+ * Licensed under MIT (https://coreui.io/pro/license/)
  * --------------------------------------------------------------------------
  */
 
diff --git a/package.json b/package.json
index 5d64562248..50adc80740 100644
--- a/package.json
+++ b/package.json
@@ -36,7 +36,9 @@
     "js-compile-bundle": "rolldown --environment BUNDLE:true --config build/rolldown.config.mjs --sourcemap",
     "js-compile-bundle-bootstrap": "rolldown --environment BOOTSTRAP:true,BUNDLE:true --config build/rolldown.config.mjs --sourcemap",
     "js-compile-plugins": "node build/build-plugins.mjs",
-    "js-typecheck": "tsc --noEmit",
+    "js-typecheck": "npm-run-all --aggregate-output --parallel js-typecheck-src js-typecheck-entries",
+    "js-typecheck-src": "tsc --noEmit",
+    "js-typecheck-entries": "tsc --project build/tsconfig.entries.json",
     "js-typecheck-dist": "tsc --project js/tests/types/tsconfig.json",
     "js-emit-types": "tsc --project build/tsconfig.dts.json",
     "js-lint": "eslint --cache --cache-location .cache/.eslintcache --report-unused-disable-directives",