chore: adding in build validation (#1651)

* chore: adding in build validation

* fix(scripts): harden CJS export introspection in build validation

Guard the CJS runtime check against modules that resolve to null,
undefined, or a primitive (avoiding a TypeError on `Object.keys`/`in`),
and correctly treat a bare function export (`module.exports = fn`) as a
valid export rather than flagging "exposes no exports".

Addresses review feedback on PR #1651.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: jaredwray

.github/workflows/tests.yml

@@ -41,5 +41,8 @@ jobs:
       - name: Build
         run: pnpm build
 
+      - name: Validate Build Output
+        run: node scripts/test-build.mjs
+
       - name: Test
         run: pnpm test:ci

package.json

@@ -7,6 +7,7 @@
     "test": "pnpm -r test",
     "test:list": "pnpm -r --workspace-concurrency 1 test",
     "test:ci": "pnpm -r test:ci",
+    "test:build": "pnpm build && node scripts/test-build.mjs",
     "test:services:start": "docker compose up -d",
     "test:services:stop": "docker compose down",
     "website:build": "pnpm recursive --filter @cacheable/website run website:build",
@@ -19,13 +20,15 @@
   "keywords": [],
   "author": "Jared Wray <me@jaredwray.com>",
   "license": "MIT",
-  "packageManager": "pnpm@11.3.0",
+  "packageManager": "pnpm@11.5.1+sha512.93f7b57422ea7068257235b4c16eb60762eb68e1dc23723199cc739043ea9be2c4143274a399d8c6defa2b1176226d9ca1c4b63482d6200c1a8fbaa78c1d1485",
   "devDependencies": {
+    "@arethetypeswrong/cli": "^0.18.3",
     "@biomejs/biome": "^2.4.14",
     "@faker-js/faker": "^10.4.0",
     "@types/node": "^24.12.2",
     "@vitest/coverage-v8": "^4.1.5",
     "@vitest/spy": "^4.1.5",
+    "publint": "^0.3.21",
     "rimraf": "^6.1.3",
     "vitest": "^4.1.5",
     "wrangler": "^4.87.0"