test: validate published package contract

.github/workflows/ci.yml

@@ -45,6 +45,10 @@ jobs:
       - name: Build
         run: pnpm run build
 
+      - name: Verify packed package
+        if: matrix.node == 22
+        run: pnpm run package:check
+
       - name: Upload coverage
         if: matrix.node == 22
         uses: codecov/codecov-action@v4

eslint.config.mjs

@@ -123,6 +123,16 @@ export default [
       "@typescript-eslint/no-invalid-void-type": "off",
     },
   },
+  {
+    ...tseslint.configs.disableTypeChecked,
+    files: ["scripts/**/*.mjs", "scripts/**/*.ts"],
+    rules: {
+      ...tseslint.configs.disableTypeChecked.rules,
+      "@typescript-eslint/explicit-function-return-type": "off",
+      "no-console": "off",
+      "no-undef": "off",
+    },
+  },
   prettier,
   // curly must come AFTER prettier — eslint-config-prettier disables it otherwise
   {

package.json

@@ -33,9 +33,14 @@
   "type": "module",
   "exports": {
     ".": {
-      "types": "./dist/index.d.ts",
-      "import": "./dist/index.js",
-      "require": "./dist/index.cjs"
+      "import": {
+        "types": "./dist/index.d.ts",
+        "default": "./dist/index.js"
+      },
+      "require": {
+        "types": "./dist/index.d.cts",
+        "default": "./dist/index.cjs"
+      }
     }
   },
   "main": "./dist/index.cjs",
@@ -49,15 +54,16 @@
   ],
   "scripts": {
     "build": "tsup",
+    "package:check": "pnpm run build && node scripts/check-packed-package.mjs && attw --pack . && publint",
     "dev": "tsup --watch",
     "clean": "rm -rf dist",
-    "release:check": "pnpm run clean && pnpm run test:run && pnpm run typecheck && pnpm run lint && pnpm run format:check && pnpm run build",
+    "release:check": "pnpm run clean && pnpm run test:run && pnpm run typecheck && pnpm run lint && pnpm run format:check && pnpm run package:check",
     "prepublishOnly": "pnpm run release:check",
     "typecheck": "tsc --noEmit",
-    "lint": "eslint src --ext .ts,.tsx",
-    "lint:fix": "eslint src --ext .ts,.tsx --fix",
-    "format": "pnpm run lint:fix && prettier --write \"src/**/*.{ts,tsx}\"",
-    "format:check": "pnpm run lint && prettier --check \"src/**/*.{ts,tsx}\"",
+    "lint": "eslint src scripts --ext .ts,.tsx,.mjs",
+    "lint:fix": "eslint src scripts --ext .ts,.tsx,.mjs --fix",
+    "format": "pnpm run lint:fix && prettier --write \"src/**/*.{ts,tsx}\" \"scripts/**/*.{mjs,ts}\"",
+    "format:check": "pnpm run lint && prettier --check \"src/**/*.{ts,tsx}\" \"scripts/**/*.{mjs,ts}\"",
     "test": "vitest",
     "test:ui": "vitest --ui",
     "test:run": "vitest run",
@@ -70,6 +76,7 @@
     "access": "public"
   },
   "devDependencies": {
+    "@arethetypeswrong/cli": "^0.18.5",
     "@eslint/js": "^9.39.1",
     "@testing-library/jest-dom": "^6.9.1",
     "@testing-library/react": "^16.3.0",
@@ -86,6 +93,7 @@
     "eslint-plugin-react-hooks": "^7.0.1",
     "happy-dom": "^20.0.10",
     "prettier": "^3.6.2",
+    "publint": "^0.3.24",
     "react": "^19.2.0",
     "react-dom": "^19.2.0",
     "tsup": "^8.5.1",