diff --git a/package.json b/package.json
index 3d097141f2..e2bf732336 100644
--- a/package.json
+++ b/package.json
@@ -4,11 +4,13 @@
   "type": "module",
   "files": [
     "**/*.js",
-    "**/*.d.ts"
+    "**/*.d.ts",
+    "**/*.mjs",
+    "**/*.d.mts"
   ],
   "description": "FunctionalScript is a purely functional subset of JavaScript",
   "scripts": {
-    "prepack": "tsc --NoEmit false",
+    "prepack": "tsc --noEmit false --emitDeclarationOnly && tsc --noEmit false --declaration false",
     "test": "tsc && node ./fjs/module.ts t",
     "cov": "node --test --experimental-test-coverage --test-coverage-include=**/module.f.ts --test-coverage-include=**/module.f.mjs",
     "start": "node ./fjs/module.ts",
diff --git a/tsconfig.json b/tsconfig.json
index 57c938b3d9..1534b6fbd0 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -42,8 +42,8 @@
     // "noResolve": true,                                /* Disallow `import`s, `require`s or `<reference>`s from expanding the number of files TypeScript should add to a project. */
 
     /* JavaScript Support */
-    // "allowJs": true,                                  /* Allow JavaScript files to be a part of your program. Use the `checkJS` option to get errors from these files. */
-    // "checkJs": true,                                  /* Enable error reporting in type-checked JavaScript files. */
+    "allowJs": true,                                  /* Allow JavaScript files to be a part of your program. Use the `checkJS` option to get errors from these files. */
+    "checkJs": true,                                  /* Enable error reporting in type-checked JavaScript files. */
     // "maxNodeModuleJsDepth": 1,                        /* Specify the maximum folder depth used for checking JavaScript files from `node_modules`. Only applicable with `allowJs`. */
 
     /* Emit */